This was the hardest build I've ever taken on! Almost threw in the towel a few times. So don't think I whizzed right through this! The troubleshooting process for the trigger wheel was a 5 day ordeal, and even after I got the bike running, it took me another full week of messing around with the bike to get it to run even decently. And then even after that, I has an issue crop up where the bike would randomly go lean and want to die. Turns out....the fuel filter was clogged! So use a BIG AN6, 100 micron fuel filter, and make sure your tank is at least moderately clean. The smaller AN6 30 micron fuel filters are too fine, and will quickly clog if your tank is dirty. Comprehensive EFI how-to conversion is over on Patreon, in addition to the Turbo how-to video, which is a 40+ minute long video explaining in depth how-to turbocharge your motorcycle. Come join us! www.patreon.com/doctormotorcycle
I have a 20 valve Yamaha, carbureted, 1000cc bike I want to turbo charge but this makes it look a lot harder than expected! Nice work, helluva build, and great video.
You can make it as simple or as complicated as you want. I can help you set it up w/carb and make it super simple, I've helped dozens of people do it on patreon. If that doesn't interest you, I'd suggest a GT15-GT20 in draw-thru config, HSR42 carb, 25 pilot, richest needle clip position, and 185 main jet will probably get it running good enough to make boost. Cheers
@@DoctorMotorcycle Oh a turbo was always on the table, but it's been taking up sapce in my brother's garage for too long now so that nagasaki rod knocker and maybe EFI will come in V3
I was actually going to ask about your fuel pump though since I'm also having hairbrained schemes for my 2000 SV650, which is mainly just an EFI conversion without having to meddle with the tank too much
Yeah, I've always wanted to build a Big inline four w/Turbo, maybe do an EFI conversion on it as well, and bike big boy (150HP+) type of power. With the big displacement it actually wouldn't be all that hard, especially if we went into the motor.
I know there's that one company in the UK that did a current gen Z900RS. I don't remember how much boost, but I remember it was a little over 200whp and they were selling kits for it that cost as much as the bike did brand new 😂.
Wow...that trigger wheel looks tiny, I wonder how it can read the pulses...it didn't 😂!! I hope that the IC survives on that exposed location!! Awsome build, really inspiring❤❤ ...have to build one now! Thanks mate!
Yeah that was a PITA tbh, 'cause obviously I was a total noob at the time and it took me a couple days just to get tuner studio working and to figure out how to do a tooth log, lol. I made a post in a FB group and that's exactly what a guy names Arrtu said; the small diameter wheel means the gaps are too small, hence the spark being intermittent. I was so stoked when it ended up working, that was 5 day ordeal. Cheers!
Hi, i have turbocharged Honda Cb400n, at first it was carburetted blow through, then i modified it to custom made EFI. The turbo i used was kp-35 just a lottle bit bigger than vz21 but it was making boost in neutral wich meant there was some load in neutral, i think it might have been too much pumping loses from too small exhaust side of turbo and badly welded exhaust manifold. Right now i am welding much better stainless manifold and i'll use bigger gt15 turbo, if i'll have problems with it spooling only at high rpm i might use kp-35 to make twin turbo sequential setup. Does your twin vz21 setup have to rev very high to have boost or 400cc engine can supply enough exhaust gases to build boost at lower rpm too with twin vz21 setup? EDIT: Ok, now i realized you used twin GT-15 turbos at first, do you think a single GT-15 would work fine for 400cc?
Firstly, how are you measuring boost? Make sure the gauge is on the plenum and preferably away from the throttle bodies/cylinder ports. The intake pulses on a twin can throw off the reading and make the needle bounce, it's why I always recommend people run a Marshall Liquid Filled Gauge. A VZ21 is suitable to up to 100HP, and the KP-35 probably similar. You're only making 34HP n/a and you'd be at around 50HP or so on 8-9psi which is still plenty of headroom for either of the small turbo's. A GT15 would be too big, I tried to run one on this bike the first time I built it and it wouldn't make more than 4-5psi. If you want direct build support, and a comprehensive breakdown of turbo sizing and setup, I can help you with that on Patreon. I offer e-mail support and diagnostics for all my Journeyman tier Patron's, it will be the best $10 you ever spent, I promise. www.patreon.com/doctormotorcycle
I was told (must be incorrectly!) that the 400n didn't have a charging circuit capable of keeping on top of a EFI fuel pump, do you have a build page/channel with more detail?
And the 5th time I watch your video it is very interesting to see the transformation from carburettor to injection, if possible which trigger tone wheel did you use? Thank you
Where'd you get the dual throttle body setup from? and what Megasquirt did you use? Considering going efi/turbo on my cb550 was thinking of trying some can-am 800 throttle bodies. Aside from existing efi platforms ecotrons is the only other place I've found decently priced TB's but I did a 4 into 2 murray carb swap for the CB and think those tb's may be a relatively "bolt-on" option for that intake manifold setup.
They're from a ninja 650, as you can see in the video it took some work to get them functional. I would see if you can find a small inline 4 that has similar port spacing, maybe a CBR600 or R6. That way you have the injectors/fuel rail already good to go, and then just make offset manifolds to get them to work. The how-to video on Patreon would be a giant help to you if you decide to do the conversion, especially with regards to the trigger wheel. Regardless, good luck!
I can build you a one-off kit, hit me up through my website if you're interested. I'm doing a Buell Motor Build/Turbo setup right now so it wouldn't be until later this year/early next year. There's a contact form on my website if you're interested. Thanks! My name is Jimmy. www.doctor-motorcycle.com
Bring me one and cover the cost and I'll do it. Otherwise I probably won't be doing this for a while, I was $1,600 into the EFI portion alone, though next time around I could probably do it for $1,200. Hit me up via my website if you're interested. www.doctor-motorcycle.com
How many cc is that engine and what turbos are you using, haven't watched the full video but idk if you mention it or not, let me check the description too Edit: twin turbos on a 400cc engine? I wonder at what rpm they start making boost
Started with GT15's, they worked but it only made 9psi of boost even with the wastegates shut. Went to VZ21's, if you look closely at the end you'll notice that when crusing at 40-50mph it's making 5-7psi of boost, it can make full boost (15psi) by about 7k rpm. It pulls to 10,000.
@@My_Gaming_Mind It pulls hard for sure! I thought about putting it on a dyno but that's going to be later down the line when I start to do more engine mods (cams, big bore, and methanol).
@@Frollicking_Gurnard Agreed, it's one of those things that I'd love to do but on this bike it would've required buying a street tire/swapping it on, and then since it's a dirtbike, swapping it back which would've been a pain. I'm doing a Buell build right now that we're going to get some numbers on, though I doubt I'll be able to talk the owner into paying for a before/after dyno session, lol. Cheers!
Hello! Sorry for not having followed your building even if I am a subscriber since I saw your mad max scrambler. I just wanted to ask if you are on stock internals and if you lowered compression? And what is stock compression ratio? I like the GS engine, it might be outdated but it´s still a good and reliable engine :) I´m thinking of maybe get a GS500E, they are really cheap here.
I lowered the compression via opening up the combustion chambers, it's now 8.6:1 compression. I opened up the ring gap quite a bit larger than the stock gap, honed/new rings, did basic maintenance like valve lash. The head is ported as well. I spin this bike to 10,500RPM and have gone as high as 11,000 on both 400's and 450's. The GStwins are solid engines, you can't go wrong. It's on E85 with a giant intercooler, which is why I'm able to run so much boost.
I've watched about 8 of the time lapse videos. Im curious (I apologize if this has been answered already) what happens to the bikes. Does the doctor just have a bad ass bike collection or are they sold
um may i ask, i still confused about the oil line to the turbo, should it be from the oil pan or bucket or frok the oil pump that i reroute it to the turbo? i might turbo my bike later
It depends on the bike, but it needs to come from anywhere in the oiling system that is pressurized. The oil filter housing is a sure bet if there's no oil galley plugs on your engine.
Depends how you want to do it. I'd do a draw-thru with a GT15. I can walk you through everything on Patreon, I even have a tuning video of a draw-thru turbo on an XJ650. www.patreon.com/doctormotorcycle
why run a cooler when a bike gets nothing but cold air lol get a dyno done n a dyno of a standard bike the same no turbos n i bet there wont be much difference n it wont get boost .a dyno sheet will prove if the turbos are working and giving you way more horsepower like a turbo should if done correctly
![[HONDA CB400SF Motorcycle Full Restoration ④] Rear Suspension, Front Fork, Frame Overhaul](/img/n.gif)
Well, apart from all the mechanical wizardry, I really like that sticker finish on the tank! What a beast.
Thanks, I was tired of looking at the got boost sticker but I always thought a complete sticker bomb looks like theres too much going on.
This was the hardest build I've ever taken on! Almost threw in the towel a few times. So don't think I whizzed right through this! The troubleshooting process for the trigger wheel was a 5 day ordeal, and even after I got the bike running, it took me another full week of messing around with the bike to get it to run even decently. And then even after that, I has an issue crop up where the bike would randomly go lean and want to die. Turns out....the fuel filter was clogged! So use a BIG AN6, 100 micron fuel filter, and make sure your tank is at least moderately clean. The smaller AN6 30 micron fuel filters are too fine, and will quickly clog if your tank is dirty.
Comprehensive EFI how-to conversion is over on Patreon, in addition to the Turbo how-to video, which is a 40+ minute long video explaining in depth how-to turbocharge your motorcycle. Come join us! www.patreon.com/doctormotorcycle
Love the gs build series and watching its progression from single turbo carbed to twins and efi!! Great build, looks like an awesome ripper!!
Thanks Billy, it's changed quite a bit over the years that's for sure. Can't wait to rip this version in the Dunes!
I have a 20 valve Yamaha, carbureted, 1000cc bike I want to turbo charge but this makes it look a lot harder than expected! Nice work, helluva build, and great video.
You can make it as simple or as complicated as you want. I can help you set it up w/carb and make it super simple, I've helped dozens of people do it on patreon. If that doesn't interest you, I'd suggest a GT15-GT20 in draw-thru config, HSR42 carb, 25 pilot, richest needle clip position, and 185 main jet will probably get it running good enough to make boost. Cheers
@@DoctorMotorcycle you’re awesome. This is great info on getting started. Appreciate the reply, brother! 🤘🏻
@@stevebarnettehe’s The Dude for these times, for sure
These videos are food for a man's soul. Thank you.
It was simply incredible! You are a customization genius... I watch you from Brazil
Thank you very much!
The coolest frickn dang thang on the planet! Thanks for sharing man
True turbo-scrambelr \m/ I really enjoyed the process - thank you!
Glad you enjoyed it!
Criminally underrated
You made an excellent job of that Suzuki was great to see the stages and teethibg orobs getting ironed out along the way.
Genius.
props from INDIA.
This is truly amazing technology..!
This is giving me impure thoughts about my CX build
do eeeeettt
@@DoctorMotorcycle Oh a turbo was always on the table, but it's been taking up sapce in my brother's garage for too long now so that nagasaki rod knocker and maybe EFI will come in V3
I was actually going to ask about your fuel pump though since I'm also having hairbrained schemes for my 2000 SV650, which is mainly just an EFI conversion without having to meddle with the tank too much
Really enjoyed this, always have vw type 1 carb gaskets to hand they fit lots things and wd40 is great to remove sticker glue😊
I'll give that a try, though I use goo gone on the residue and it works pretty great.
Best kind of ASMR
This is so cool. You're the man bro keep it up!
Much love from NZ
Appreciate it!
Great, great job .. well done Brother really looks like a professional work . 👏
You're a braver man than I !
Thanks Peter!
This makes me curious to see what the doc could cook up with something like a Kawasaki KZ1000.
Good shit, Doc!
Yeah, I've always wanted to build a Big inline four w/Turbo, maybe do an EFI conversion on it as well, and bike big boy (150HP+) type of power. With the big displacement it actually wouldn't be all that hard, especially if we went into the motor.
I know there's that one company in the UK that did a current gen Z900RS. I don't remember how much boost, but I remember it was a little over 200whp and they were selling kits for it that cost as much as the bike did brand new 😂.
Wow...that trigger wheel looks tiny, I wonder how it can read the pulses...it didn't 😂!! I hope that the IC survives on that exposed location!! Awsome build, really inspiring❤❤ ...have to build one now! Thanks mate!
Yeah that was a PITA tbh, 'cause obviously I was a total noob at the time and it took me a couple days just to get tuner studio working and to figure out how to do a tooth log, lol. I made a post in a FB group and that's exactly what a guy names Arrtu said; the small diameter wheel means the gaps are too small, hence the spark being intermittent. I was so stoked when it ended up working, that was 5 day ordeal. Cheers!
really would love to see a dyno sheet on your boosted builds!
That sticker bomb "insert" idea looks good af
Thanks!
Great looking motorcycle!
Thank you!
Hi, i have turbocharged Honda Cb400n, at first it was carburetted blow through, then i modified it to custom made EFI. The turbo i used was kp-35 just a lottle bit bigger than vz21 but it was making boost in neutral wich meant there was some load in neutral, i think it might have been too much pumping loses from too small exhaust side of turbo and badly welded exhaust manifold. Right now i am welding much better stainless manifold and i'll use bigger gt15 turbo, if i'll have problems with it spooling only at high rpm i might use kp-35 to make twin turbo sequential setup. Does your twin vz21 setup have to rev very high to have boost or 400cc engine can supply enough exhaust gases to build boost at lower rpm too with twin vz21 setup? EDIT: Ok, now i realized you used twin GT-15 turbos at first, do you think a single GT-15 would work fine for 400cc?
Firstly, how are you measuring boost? Make sure the gauge is on the plenum and preferably away from the throttle bodies/cylinder ports. The intake pulses on a twin can throw off the reading and make the needle bounce, it's why I always recommend people run a Marshall Liquid Filled Gauge. A VZ21 is suitable to up to 100HP, and the KP-35 probably similar. You're only making 34HP n/a and you'd be at around 50HP or so on 8-9psi which is still plenty of headroom for either of the small turbo's. A GT15 would be too big, I tried to run one on this bike the first time I built it and it wouldn't make more than 4-5psi.
If you want direct build support, and a comprehensive breakdown of turbo sizing and setup, I can help you with that on Patreon. I offer e-mail support and diagnostics for all my Journeyman tier Patron's, it will be the best $10 you ever spent, I promise. www.patreon.com/doctormotorcycle
I was told (must be incorrectly!) that the 400n didn't have a charging circuit capable of keeping on top of a EFI fuel pump, do you have a build page/channel with more detail?
Hold on Bettsy!
Lol pretty awesome!!!!
And the 5th time I watch your video it is very interesting to see the transformation from carburettor to injection, if possible which trigger tone wheel did you use? Thank you
GREAT JOB!👏👍
Thank you! 👍
Right on man .
Can you dyno one of your turbo bikes?
insane! great job man
Damn, I’d love you to work on my 99 HD 883. Legend!!
For sure, hit me up through my website. -Jimmy
Dear mechanic.
You rool!!!
мотоцыкл просто класс у вас получился
Where'd you get the dual throttle body setup from? and what Megasquirt did you use? Considering going efi/turbo on my cb550 was thinking of trying some can-am 800 throttle bodies. Aside from existing efi platforms ecotrons is the only other place I've found decently priced TB's but I did a 4 into 2 murray carb swap for the CB and think those tb's may be a relatively "bolt-on" option for that intake manifold setup.
They're from a ninja 650, as you can see in the video it took some work to get them functional. I would see if you can find a small inline 4 that has similar port spacing, maybe a CBR600 or R6. That way you have the injectors/fuel rail already good to go, and then just make offset manifolds to get them to work. The how-to video on Patreon would be a giant help to you if you decide to do the conversion, especially with regards to the trigger wheel. Regardless, good luck!
I’ve got a 99 Dyna Super Glide that I would love to turbo!
I can build you a one-off kit, hit me up through my website if you're interested. I'm doing a Buell Motor Build/Turbo setup right now so it wouldn't be until later this year/early next year. There's a contact form on my website if you're interested. Thanks! My name is Jimmy. www.doctor-motorcycle.com
Love this
So good! How about an inline 4 turbo, like an FZR400?
Bring me one and cover the cost and I'll do it. Otherwise I probably won't be doing this for a while, I was $1,600 into the EFI portion alone, though next time around I could probably do it for $1,200. Hit me up via my website if you're interested. www.doctor-motorcycle.com
Leg guard and rear mirror should be there in bike
How many cc is that engine and what turbos are you using, haven't watched the full video but idk if you mention it or not, let me check the description too
Edit: twin turbos on a 400cc engine? I wonder at what rpm they start making boost
Started with GT15's, they worked but it only made 9psi of boost even with the wastegates shut. Went to VZ21's, if you look closely at the end you'll notice that when crusing at 40-50mph it's making 5-7psi of boost, it can make full boost (15psi) by about 7k rpm. It pulls to 10,000.
@@DoctorMotorcycle ah, probably has an amazing top end, also you should dyno it
@@My_Gaming_Mind A before and after dyno video would be awesome.
@@My_Gaming_Mind It pulls hard for sure! I thought about putting it on a dyno but that's going to be later down the line when I start to do more engine mods (cams, big bore, and methanol).
@@Frollicking_Gurnard Agreed, it's one of those things that I'd love to do but on this bike it would've required buying a street tire/swapping it on, and then since it's a dirtbike, swapping it back which would've been a pain. I'm doing a Buell build right now that we're going to get some numbers on, though I doubt I'll be able to talk the owner into paying for a before/after dyno session, lol. Cheers!
🤘 🤪 🤘 👍 👍
lol did to trip a Break at 7:38?
Hello! Sorry for not having followed your building even if I am a subscriber since I saw your mad max scrambler. I just wanted to ask if you are on stock internals and if you lowered compression? And what is stock compression ratio? I like the GS engine, it might be outdated but it´s still a good and reliable engine :) I´m thinking of maybe get a GS500E, they are really cheap here.
I lowered the compression via opening up the combustion chambers, it's now 8.6:1 compression. I opened up the ring gap quite a bit larger than the stock gap, honed/new rings, did basic maintenance like valve lash. The head is ported as well. I spin this bike to 10,500RPM and have gone as high as 11,000 on both 400's and 450's. The GStwins are solid engines, you can't go wrong. It's on E85 with a giant intercooler, which is why I'm able to run so much boost.
@@DoctorMotorcycle Thank you!
I've watched about 8 of the time lapse videos. Im curious (I apologize if this has been answered already) what happens to the bikes. Does the doctor just have a bad ass bike collection or are they sold
Some aren't mine to begin with, some I keep and others get sold. This bike I still own.
Fucking beautiful
You should block the POV and do a little short video of some turbo noises 😍
Inb4 “ not good for the turbos”
Not a bad idea
What cleaning spray did you use near the beginning of the video?
Water and dish soap
Where are you located? I'd like to get my 2010 Honda CBR 600RR ABS hooked up by you!!!
I'm in Phoenix, Az. Hit me up through my website if you're close. If it's in your budget, we can ship the bike via u-ship as well. Thanks!
Is the quick shifter cutting spark or fuel?
Spark
Muy bueno
um may i ask, i still confused about the oil line to the turbo, should it be from the oil pan or bucket or frok the oil pump that i reroute it to the turbo? i might turbo my bike later
It depends on the bike, but it needs to come from anywhere in the oiling system that is pressurized. The oil filter housing is a sure bet if there's no oil galley plugs on your engine.
do you think that a virago 535 is turbochargeable?
Absolutely.
How do I attach a turbocharger to a carburetor .I have a Yamaha xj 650 4 cylinders and still need to replace the engine, the old one won't work
Depends how you want to do it. I'd do a draw-thru with a GT15. I can walk you through everything on Patreon, I even have a tuning video of a draw-thru turbo on an XJ650. www.patreon.com/doctormotorcycle
Genial
Ni ce😂
what gloves are those?
Just basic fingerless gloves from Cycle Gear
what is your ebay page?
купил бы себе урал а не иж не мучался бы с зажиганием
It's a Suzuki GR.
It's a 1977 Suzuki GS400, GR's weren't made until 1983.
🆒 🎉
why run a cooler when a bike gets nothing but cold air lol get a dyno done n a dyno of a standard bike the same no turbos n i bet there wont be much difference n it wont get boost .a dyno sheet will prove if the turbos are working and giving you way more horsepower like a turbo should if done correctly
you need a better crimping tool my friend
I'm all ears