Revving a standard bike that hard will inevitably result in issues, unfortunately. Despite being a 2-stroke the 400 is a long stroke engine that doesn’t like to be revved above 8500 RPM and as the power tends to taper off before that anyway, it’s better to change up before that sort of figure anyway.
TZ crank bearings are roller instead of balls as the straight cut primary gears don’t cause a lot of side to side movement. Don’t think TZ pistons were forged from the factory. My 400 uses TZ 700 pistons in a English Fahron water cooled cylinder/head. Rods are similar to stock. Piston speed is important as much over 8000 is going to be a problem. I used Erv Kanemoto design chambers, bike was geared for 140mph. TZ front end, tz350 clutch, cr gears, straight cut primary, Brembo calipers, motoplat ign.
TZ bearings are ball bearings not roller bearings. (TZ350). The big end bearings use a light weight silver plated cage which has advantages over the standard RD big end bearings.
Not many RD owners didn't become weekend motorcycle mechanics. I ended up rebuilding top ends before dinner time then off to run it in over the weekend..
Late model RD400 cranks were made with suspect materials, I broke one in half as well, just pulling away from a stop at low rpm. Dont think the bearings ave anything to do wit it
The 2-stroke engine is alive & well in snowmobiles. Check out the Rotax ETEC voice coil direct fuel injection engine that Skidoo has been using to power their snowmobiles for more than a decade.
I hope there wasn't any damage to the cylinders. I have my grandfather's RD400 76 too. Me and my dad are rebuilding it. My dad likes your vids, your bike is awesome.
I had a 1974 RD 350 many years ago and did the unthinkable and ran it out of injector oil and while passing a car doing approx. 70 at first I thought I had run out of fuel and reached over to turn it to reserve and the back wheel started to lock up . yanked the clutch in and coasted to the side of the road . I forgot to check the oil tank the night before because I got home late. lesson learned
Yup I did the exact same thing on my RD400 on the freeway, the upside is that I learned how to tear down a 2 stroke and rebuild it after getting a new crankshaft. I put one of the oil seals in backwards so I had to do it all over again, lol
Believe it or not all it did was Score the hell out of the one piston and the Bore slightly. replaced the piston got it running (not running the greatest ) and used it as a trade in on a 1979 Kawasaki KZ650 my son has a 1989 rz350 (water cooled ) which is torn down now for a rebuild. it brings me back when I ride his bike .
The stock bearings were good till about 8000 rpm. To beat on these bikes, you had to use the tz250 rods and bearings with forged pistons, Like in my rd400
@@pauloconnor7951 they were made with recesses on the thrust portion of the rod bearing and worked together with the tz250 rod bearing with had a high nickel(?) content. The thrust washers were a silver color as opposed to the stock thrust washers being bronze colored.
@@pauloconnor7951 if you mean the wrist pin, the stickers were ok for street use. They used to put the Kawasaki wrist pin bearings in the RDs. The thrust bearings are on the big end.
I had a crankshaft on a 1979 RD400F Daytona Special break in half, during normal operation. found a used one from California, ran good for a decade after that, still got the broken parts around here somewhere .......nice road you live on by the way...............wb
I've heard the '79 cranks had problems but the earlier ones normally don't. Anyway, I have a new one and some new pistons. It will be running again shortly.
I had a RD 350, that had a crank seal fail at about 100 mph, = lean condition= holed a piston = Instant 175cc. Race like conditions begat race like failures. Went to litre bikes after that!
Not sure what you mean. The RD400 is air cooled and the Banshee is water cooled. 400cc vs. 350cc. Same bore and piston but the 400 has a longer stroke. Banshee makes more power than a stock 400 motor.
Red or green were the 1976 US colours. In Canada our 1976 RD400s came with “Low Gloss Black” paint. Most of us waxed them until they shone. That’s the past tense of shine, intransitive, like “The Sun shone.”. Shined is the past, transitive, like “I shined my shoes.” To avoid any confusion.
![สั่งทอง.. จาก temu ของจริงป่ะ? ( part : 1/2 ) [โกงไหมครับ ep.94 ] | DOM](http://i.ytimg.com/vi/2tYS1qTMB78/mqdefault.jpg)
Revving a standard bike that hard will inevitably result in issues, unfortunately. Despite being a 2-stroke the 400 is a long stroke engine that doesn’t like to be revved above 8500 RPM and as the power tends to taper off before that anyway, it’s better to change up before that sort of figure anyway.
TZ crank bearings are roller instead of balls as the straight cut primary gears don’t cause a lot of side to side movement. Don’t think TZ pistons were forged from the factory. My 400 uses TZ 700 pistons in a English Fahron water cooled cylinder/head. Rods are similar to stock. Piston speed is important as much over 8000 is going to be a problem. I used Erv Kanemoto design chambers, bike was geared for 140mph. TZ front end, tz350 clutch, cr gears, straight cut primary, Brembo calipers, motoplat ign.
TZ bearings are ball bearings not roller bearings. (TZ350). The big end bearings use a light weight silver plated cage which has advantages over the standard RD big end bearings.
So that's what the red line is for !
They weld the crank pins on High Performance RD's and RZ's plenty of aftermarket crank shafts out there for Banshee's
Not many RD owners didn't become weekend motorcycle mechanics. I ended up rebuilding top ends before dinner time then off to run it in over the weekend..
Late model RD400 cranks were made with suspect materials, I broke one in half as well, just pulling away from a stop at low rpm. Dont think the bearings ave anything to do wit it
I love this motorcycle, Its such a shame that there is no new two strokes
We all do but let’s be honest 8mpg isn’t that great
@@charlesmeyer7021 Fun > fuel consumption - my humble opinion :-)
The 2-stroke engine is alive & well in snowmobiles. Check out the Rotax ETEC voice coil direct fuel injection engine that Skidoo has been using to power their snowmobiles for more than a decade.
Why Not buy a Jawa 350 twin as they are still being made?
That has a crankshaft that won't break but about 80mph is flat out
I've vapor blasted quite a few of these RD cases. I love these old two strokes.
I hope there wasn't any damage to the cylinders. I have my grandfather's RD400 76 too. Me and my dad are rebuilding it. My dad likes your vids, your bike is awesome.
No other damage and my bike is all fixed. I'll try to make some more vids. Grandfather's RD? I bought mine in 1976 and now you make me feel old :-)
I had a 1974 RD 350 many years ago and did the unthinkable and ran it out of injector oil and while passing a car doing approx. 70 at first I thought I had run out of fuel and reached over to turn it to reserve and the back wheel started to lock up . yanked the clutch in and coasted to the side of the road . I forgot to check the oil tank the night before because I got home late. lesson learned
Yup I did the exact same thing on my RD400 on the freeway, the upside is that I learned how to tear down a 2 stroke and rebuild it after getting a new crankshaft. I put one of the oil seals in backwards so I had to do it all over again, lol
Believe it or not all it did was Score the hell out of the one piston and the Bore slightly. replaced the piston got it running (not running the greatest ) and used it as a trade in on a 1979 Kawasaki KZ650 my son has a 1989 rz350 (water cooled ) which is torn down now for a rebuild. it brings me back when I ride his bike .
The stock bearings were good till about 8000 rpm. To beat on these bikes, you had to use the tz250 rods and bearings with forged pistons, Like in my rd400
What's so hot about TZ250 rods please ?.
@@pauloconnor7951 they were made with recesses on the thrust portion of the rod bearing and worked together with the tz250 rod bearing with had a high nickel(?) content. The thrust washers were a silver color as opposed to the stock thrust washers being bronze colored.
@@genegeneish hmmm interesting, good to know. Vitos sell silver small end bearings. Additional roller and lighter too. :)
@@pauloconnor7951 if you mean the wrist pin, the stickers were ok for street use. They used to put the Kawasaki wrist pin bearings in the RDs. The thrust bearings are on the big end.
@@pauloconnor7951 Well, they were made for a dedicated race bike with double the power.
Zero mechanical sympathy deserves no human sympathy
He'll learn the hard way if he keeps doung it.
You did bury that rev counter into the red quite a bit lol
Respect tho
I had a crankshaft on a 1979 RD400F Daytona Special break in half, during normal operation. found a used one from California, ran good for a decade after that, still got the broken parts around here somewhere .......nice road you live on by the way...............wb
I've heard the '79 cranks had problems but the earlier ones normally don't. Anyway, I have a new one and some new pistons. It will be running again shortly.
Willard Brown , I wish I my motorcycle driver's license back in my Senior year High school.
Thrashed the guts out of it..
Too many revs....
Those 400's were torque but not revs.....
I had a '76 RD-400 Green same color as yours I don't remember the yellow though .. I have one photo some where I need to dig up
ouch! the tacho was pegged bro!
Nuts!!
I am currently building a Rd400c 'custom'
What sprockets front and rear do you use?
It pulls nicely
16/38 sprockets
Ah can you tell me how many miles it had on it?
Honestly I've never heard of anything like that happening before. wow
It's not common. I guess because it's old and stressed from racing and high rpm use.
Lead balance weight fall out and jam the crank, see the round hole at the 10 o.clock position, should be a round lead weight in there.
@@richardblencowe3924 Ding ding ding. Cranks don't fail like that without gross battering.
Reving it to 10,000 probably did the damage...
A sound known to all two stroke owners at some time expensive silence?
I had a RD 350, that had a crank seal fail at about 100 mph, = lean condition= holed a piston = Instant 175cc. Race like conditions begat race like failures. Went to litre bikes after that!
How does this engine compare to the Banshee??
Not sure what you mean. The RD400 is air cooled and the Banshee is water cooled. 400cc vs. 350cc. Same bore and piston but the 400 has a longer stroke. Banshee makes more power than a stock 400 motor.
I dont recognise that color...my was red, i know silver and white but green? what year?
In 1976 they came in red or green
Red or green were the 1976 US colours. In Canada our 1976 RD400s came with “Low Gloss Black” paint. Most of us waxed them until they shone. That’s the past tense of shine, intransitive, like “The Sun shone.”. Shined is the past, transitive, like “I shined my shoes.” To avoid any confusion.
I dig the green. It's a fantastic look.
Revving way past the power band is not fast and may result in catastrophic damage 😅
Did result in catastrophic damage.
I know the Banshee has problems with the crankshaft. Most who raced them would have the crank trued and welded to prevent failure.
Atleast it wouldn't have damaged the bores etc !
breaks in half or seized a rod?
I just broke in half, the rods are ok
May I ask where you got the new crank from?
oh that poor RD :( there for show not go at that age
This one is for go.
Just had same trouble with my RS200 😩
Craig Newman is it bajaj rs 200?
That's one of those fancy 2 piece cranks huh ;-) At least you didn't have to push it far..lol.
poor Geneva Green
It will be fixed, it will be better :-)
WoW...Dats Nice....🤬
20
shit that sucks
К.вал как на яве.