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Bra och bra, men jämfört med originalet så är det i alla fall skillnad😉 Märkes väl främst på videt

@@bolarsson2385 Coolt bygge är det iaf! Extra ball att ta en lite mindre motor, allt är så hysteriskt nu för tiden så det här är uppfriskande.

@@viktorandersson7819 Det är väl faktiskt det som verkar göra denna hoj intressant, egentligen helt vansinnigt men kul projekt. Man kan nog säga att denna hoj är ganska unik på sitt sätt. En uppföljning är på gång i garaget sår nämligen en till CB250N som det nu sitter en turbo på, dock räknar jag med minst två vintrar till innan den är körbar.

@@bolarsson2385 Spännande! Jag ser gärna videos även om den 😄

I think the Aisin AMR300 would be a good choise for a 500 cc single, if I remember right it's specified from 250 cc to 600 cc engines. I know that the AMR300 has been used on some SR400 builds and I also think I have seen it on some SR500 build. But I don't know how good thoose bikes you find on the internet work. My bike would not run good before I put on a CV carb and the build I found on the internet seems to use regular carbs.

@@bolarsson2385 I like the CV carbs,they work well for me on DRs and Harleys

I'm very interessted of your build, is it a draw tru or blow tru? Carbs of fuel injection?

@@bolarsson2385 it's a draw thru. Will be using a 1 3/4 inch SU carb. Early days yet tho. Frame is built, blower mount and drive well under way. Hope it will be a rolling mock up by summer's end then I will be stripping the donor engine and doing a careful rebuild.

@@linzimumford3829 Very intressting, I'm looking for a SU 1 3/4 to this bike to. It runs pretty well with the Keihin CV carb with a custom ginded throttle needle and washer inside the throttle to slow down the throttle rise under acceleration. Looking forward to see your build.

I did some bushings with tight fit to the pulley that's from some car alternator and it's just "pressed" to the flywheel with the flywheel bolt. I found the new logger "flywheel bolt" on the local car repair shop and I think it's from the front suspension from a Peugeot or some other French car.

The supercharger build is almost finish, I was planning to do a new video in the fall but the winter come early in October. I will do some small updates on the supercharger as move the boost gauge, new grips and som other small things. I have now started a new project wich is a CB250N turbo I got this idea after a friend of mine sold med two CB250N to a wery good prize and I found out that Honda made a V-twin, twin turbo intercooler 250 cc race bike in the 80'. There will probably be some videos with the turbo to.

@bolarsson2385 ?

It don't put much strain om the crank, I have thougt about a bearing inside the pulley that is attatched to the stator cover but I don't think that's nessecary.

No there's no intercooler, in my case with a draw thru supercharger it's not possible to have a intercooler when the fuel will condense in the intercooler. My next build will probably have a intercooler but that will be a CB250N with blow thru turbo and fuel injection.

Brother if I install this supercharger in my duke250 do I need to add intercooler or is it fine to run without it?

@@bolarsson2385 nice bro🔥

I'm not a pro on superchargers and turbos but you could run a AMR300 with out a intercooler if you not have to high boost preasure. The question is what you looking for, maximun power or like me, just increase the power and tourqe a bit and create a cool bike. My suggestion if you do a build a blow tru so you got the supercharger with a plenum before carb or throttle body, I think this i a lot easier to map or jet instead of draw tru. If you go for max power i think lovering the compression is a must. Do you have fuelinjection of carbs on you bike? If you have fuelinjection is it possible to map the stock fuelinjection on the bike? Last but least, this will take time and coast alot of money. I'm on my third season of testing and jetting and now I have got the bike running pretty good. I will soon do a new video but I still wailt on a custom made brakedisc to the wire wheels I going to put on my bike.

@@bolarsson2385 bro you added fuel injection for your cb250?...can you make a video about it?

I don't rememember but I think somwhere around 110-130 on first main jet and around 16-180 on secondary main jet but I'm not sure. Do you run the turbo in pull tru? I got my carb before the supercharger the most common is blow tru and have the carb after the turbo, supercharger. I'm not sure if you could use my jetting on your bike, I tkink threr's alot factors that affect the jetting. I also got another CB250N and a turbo in my garage so when this supercharger bike is finished there will be a CB250 turbo build.

I'm curios how you have done with the oil pressure to the turbo on your bike? Where have you conneted the pressure line to the turbo?

@@bolarsson2385 I connected a line from the oil pressure sensor port to the turbo (as a feed line ) and the return line is connected to the oil filter cover. Just make sure your turbo is above the engines oil level (I learned that the hard way)

@@bolarsson2385 My setup is blowthrough with two carburettors and it wont start (on 72 pilot jet and 105 main jet) I think its running extremely rich because the sparkplugs are black and smell of gasoline. How small of a jet do you think i should put in it?

I have no idea of what jets you should use, this Honda is my first build with som kind of "boost". My choice of a supercharger in pull tru was because it's old school and fit on a cafe bike. How have you done with the pressure of the bowl, mabye you have the problem there? I heard of people that have adjustable pitot pipe in the plenum and can adjust air fuel ratio with how the pitot pipe is placed in the airflow of the plenum. I hope to start my turbo build next winter so I'm very interested of your build. I got the turbo idea after read about a 250 cc Honda V-twin with double turbos, double intercoolers and fuel injection and about 150 hp. But my build will be more normal with one turbo and intercooler, but I think I will go for fuel injection because I'm interested to try that. What turbo have you put on your bike?

I hade done a new intake this winter that I have TIG welded from stainless steel I have to smooth out the bends as much it's possible so I think this will flow better than the old one. This will also looks alot better together with new polished stainless steel exhausts. My old intake and exhausts in this video looks like crap but now when I know that the bike runs with the supercharger I take care of thoose cosmetic things. I also have a rear spoked wheel ready to put on the bike but I need to find a find a spoked front wheel before I put it on the bike.

Thank you. I have done some modifications to the bike this winter, new stainless steel intake, new stainless steel exhaust and some small modifications and adjustments. I have plans of a new video but I will do that when I got the bike completely done. I also got a rear wire wheel from an old CB250 that I will fit to the bike and a CBX550 front wheel complete with the fork. The plan is to convert the front wheel to a wire wheel with adaptors rings and swap to the CBX550 fork but I think this will be the next winter.

​@bolarsson2385 do the pulley put much strain on the Crack shaft (vibration)

Denna är besiktningsbefriad men trots detta valde jag att regbesikta den med kompressorn så den är den nu regbesiktad med kompressor. Det är alltså fritt fram att köra den och jag kan vara lugn om polisen skulle vara igång eller om nåt skulle hända, möjligen skulle väl polisen klaga på ljudvolymen. Håller på att fixa lite till på hojen och tänkte snart göra en ny video på den, har gjort nytt insug i rostfritt, monterat accpump och håller på med nya avgassystem i rostfritt. Den går hyfsat bra nu efter att jag slipat en egen trottelnål, men lite finjustering är det kvar innan den går riktigt bra, den är dock fullt körbar utan problem. Har en till CB250 som står i garaget tillsammans med en turbo, för har man en kompressormatad CB250 måste man väl också ha en med turbo. Ska dock fixa till kompressorhojen innan jag tar tag med den bygget.

I'm not sure in what cars the AMR300 is mounted, but I think it is from some kind of Japanese mini cars.

I think it would be possible to do that I have seen someone put a AMR300 supercharger to a Yamaha WR250. I think that bike was in a draw thru application, I run my bike in a blow thru application with the carb before the supercharger. But I think it's possible but it's not easy and it will take alot of time but I'm pretty sure it will be possible.

I'm not remember exactly but around 50 mm diameter on the crankshaft and 95 mm diameter, this geraring will give around 0.7 bar at 10000 rpm.

idiot

I'm planning to do an other stupid project with an other CB250N, this time it will be a turbo CB250N in a classic race style. I allready got the bike and a turbo. I'm planning to start the build this winter.

So I race a destroked xr200 compound turbo bike and honestly it's the one cylinder predecessor to this engine. They can take alot of power it's the trans that's gonna give you problems. 100whp shouldn't be an issue for the engine side but the clutch and output shaft won't hold. I can't say I pushed one of these so idk exactly but iv been in enough of these engines and it follows Mr Hondas rule of 300%. That's about what the trans can take and the clutch with some springs frictions and milling the basket for an extra friction with steel. Its possible to make everything very strong though. My bike recently got past 100whp with 155cc and a crap ton of boost I'm actually running a stock set of shafts this year but I added a bearing and support where 3rd gear used to be and this seems to stop the flex and keep the hardened gears with all their teeth. To the guy with this bike I saw you say you wanted to lower the Cr don't I'm running 14:1 and over 60psi on e85. Add water injection and leave it at 9:1. If you add a spacer in the basegasket youl ruin the quench area and have detonation at no power. Do have a way to pull timing but also keep in mind these tiny cylinders are great at fighting knock by virtue of being small. The flame front has to cover less ground in the same time to normal sized engines. Less time for pressure spikes to ignite pockets. If anything tighten it up for the best quech area you can get the better mixing will do more for fighting the knock than Cr ever could and won't cost power. Cams the stock ones are tiny. I actually use yours as doners for my custom cam bigger base circle to start and it almost fits and I get two from each cam. You can cut the base circle down and what you take off there will double in lift just wrap a sand paper roll around half the cam lobe on the base circle side and do the back and forth on a vise until you get the spec you want. Take your time and check often. This is worth a good 10hp on these bikes. As for carb go bigger that thing is restrictive to start off with. From experience your gonna want a 38-45mm carb. Look for something in the slide family not the CV you have. The CV is actually better but if you choose to do that you really need to know those carbs as your gonna need to change most things in it including the slide bleed hole and spring, pilot jet possibly the pilot circuit, main jet, emoltion tube, needle, likely air jets too. That's why I say get a slide carb it's just less to do and know. Do add a stiffer spring the extra vac tends to stick them open with the stock ones. Awesome project love the drive. I would consider adding a jack shaft and moving the blower so you can have a better intake.. that one might be lean but pudding fuel on short pulls look rich until they clear out. Never have a p trap in it basically. If you must do it atleast convert to e85 so it can vaporize easier.

This project was mostly done for fun not maximum power, I think it possible to get a bit more power with not so much work. I'm sure that the transmission will take alot of power, I think the clutch are the same as XR650, and the gearbox are the same as the 400N so it will handle a bit over 40 hp. I really would like to place the supercharger in the centre of the bike where the stock carbs are but it's not possible because of the center piece of frame, in that case I have to cut in the frame. About to rise the boost I have thoughts about that with out lowering the compression and in that case use water injection, I started to experiment with water injection that but I wait to get a pump that I think will be able to use from a friend. I would also be very cool to have a water tank with a skull sticker and the warning of methanol 😉 About the carb, I tried a HSR42, a FCR, a CR33 but it's not work the engine leans out under acceleration even with the HSR and FCR pumper carbs. I talked with some people that have done draw tru superchargers and they say that CV carbs is best to use. I have put a Mikuni ACP-1 accelerator pump on my CV carb and I have also grind throttle needles to my carb and it's runs better now. This winter I have moved the nozzle to the accelerator pump from the carb to the inlet to see if that will give better throttle response when the fuel will be injected nearly the intake valves. Now I wait to the spring to arrived so I can do a test ride.

@@bolarsson2385 watch out plumbing the accelerator pump into boost and best of luck

@@bolarsson2385 just throwing this out there from my experience 40hp is cake to get. My first turbo setup did it with 18psi. I dont think supercharging is the way. I understand lag but singles have a very strong exhaust pulse. If you compare pressure waves to 4 cylinder engines youl see the spike at the beginning of the exhaust stroke is more than 3x the 4cy. With 155cc I had 18psi by 2krpm and if I gagged it anything over 4k it would get the boost needle to 18 as fast as you can open the throttle. The things youl find are most do's to get that power through are clutch and primary ratio. We first swapped to a cfr230 primary as it's a solid 30% taller primary and that means 30% less tq through the clutch. I wanna say with an extra friction and steel this worked great just doesnt like 10k 2step then clutch dump but roll on power it can take 40whp no problem. Any xr200 motor or crf230 would be a great starting point for that. I love the hsr personally but it sounds like you were running the bowl dry. I'd start looking for a restriction in the fuel system and I'd start at the petcock. Hard to flow more than 20hp through it continuously and the bowl acts as a reservoir in between when it flows more. The hsr needle and seat it fine for 140hp worth of flow out of the box. I actually ran one for years with good results until I started getting wild and way off the deep end. These days I run a yoshi mjn as I found too many benefits to it.

@@oliverscorsim I have put a check valve just behind the nozzle to the accelerator pump to prevent getting boost preasure backwards in to the accelerator pump.

Yes my engine is stock inside I was thinking about lower compression with a aluminium spacer between the crankcase and the cylinders but that will also change the camshaft timing so I you need to grind the holes in the camshaft gear to get it right if you rise the cylinders. I might will be on the limit with the boost pressure if I not lower the compression but instead I have plans to try to make a water injection system. I don't remember exactly what the gearing ratio on the supercharger but it's something about1:1,7 and then I got about 0,6 bar boost pressure.

@@bolarsson2385 thanks very much for your answer bro, waiting for ur next update on the project!

Yes, it got more power. Now I use the stock CV carb on the bike compleded with a Mikuni ACP-1 accelerator pump. I haven't still flat it out, but I got about 0,65 bar in boost at 7000 rpm with almost wide open throttle. When I run the superchager in a draw thru application the throttle position will change the boost pressure beacuse the throttle will choke the superchager at low lift. I think I now got somewhere between 45-50 hp from this 250 engine at full throttle.

Immediate blown engine bro lol

I got the same idea, gonna put it on a 77 CB50 with an 82cc Kit with ported head

Thanks, I use an wideband Innovate MTX-L, had an AEM that I bought two years and had it it laying in the box but it show out that the meter was broke out of the box. Had to buy a new one and then I choose Innovate. I have about 0.7 bar but I haven't flat it out yet ;) When I use the supercharger in draw thru application the boost will variate depending of the throttle position. I think something around 0,7 bar i max boost without lowering compression. What turbo do you use? Where have you take out the pressured oil line to feed oil to the turbo? Do you run the turbo in blow thru or draw thru? If you run blow thru what fuel pump do you use to get the fuel in the carbs pressured? My next project will be an 1979 CB250N with turbo.

@@bolarsson2385 Sorry for late reply, i used kp35 turbo from fiat 1,3jtd, vz21 would be much better (especially if you want to turbo 250cc) but it's more expensive. I run blow through setup with original carbs and i use boost referenced fuel pressure regulator and pump from chinese gy6 fuel iniected scooter. I took pressurized oil line from where oil pressure sensor originally was. The only problem that i had was that oil is heated too much by turbo and i had to install oil cooler but in 250 this problem may not occur.

I think that the Nighthawk and the CB250/400N is very similar, I think that the bottom part of the engine is much the same it's just difference in bore and stroke between thoose bikes. I had some thougts to put cylinder, pistons, cylinderhead and chamshaft from a CB400N to this engine but it will only give me about 50 cc extra volume and it semmes not worth all the work for that when I had to mill of the cylinder to fit the shorter stroke on CB250 chrankshaft.

@@bolarsson2385 I believe the nighthawk is a variation of the cb400t hawk, which I imagine is very similar to a cb400n, which I'm not sure if we got that in the states. I have since looked at my bike since watching this video and the engines are pretty close. shortstroke -big bore parallel twin would be super cool though. Greetings from Kentucky!

Tackar, men finns en hel del att kvar att göra för att den ska blir riktigt bra både maskinellt och utseendemässigt.

Inspelat igår 11/5, varit en jäkla vår då mesta snön tinade bort i slutet av mars och sen blev det kallt så det som blev kvar inte tinat bort. Hoppas det vänder och blir varmt nu.

The problem with the other carbs was that the engine leans out under acceleration, you have to open the throttle very precisely to not lean out the engine so is dies and it still runs very lean, I think the HSR42 and FCR37 is way to big for this bike and mabye a smaller pumper carb like a Mikuni TM32 could help this lean out. The CR33 is the best throttle carb so far and I have orderd a new needle jet so I will give the CR33 a second chance when I got the new jet. I still think I the 29 mm CV carb is the best choise for this bike and I will give some more work it to see if I could get it run better.

@@bolarsson2385 a good solid airbox would probably help?

@@obbezwiers I don't think an airbox will make a big difference to the other throttle carbs, I was worried to not use an airbox or velocity stack to the CV carb but it works with out airbox. I think I got stronger vaccum with the supercharger draw thru the carb than the stock engine sucking thru the carb. I will test to weight the throttle with led to get a little slower raise of the throttle I think that will help to get the engine a little bit richer under acceleration.

@@bolarsson2385 awesome, I hope you figure it out!

Den har orolig tomgång nu efter att insuget blivit tätt, kallas tydligen för blower surge. Ska se om jag kan minska ner den med att justera luftskruven, bestycka om förgasaren. Lacken är en VW färg med dekaler dom jag desingat själv och låtit trycka hos den lokala reklambyrån.

Thanks. This is very cool, I noticed that you've been working on it for a long time. I'm waiting for more videos with this cool motorcycle. I live in Russia and have been looking for something similar to your project (Supercharger) . Good luck to you