Ok so I picked up the bike Friday found out it wasnt a Ex yosh bike but it was a Cycle World cover bike. Can anyone look at it and see if they have a bike magazine laying around from a 1986 87 see if this bike is familiar? Anyways its F_cking beast to say the least. Its has a 1255 motor built from RPM Rohm Performance machine. Some of the specs in the motor.
web cams new billet
385 lift 246 duration degreeded to 105 centerline intake and exhaust.
new suzuki rockers welded and hard faced by megacycles cams in San Rafael
Pistons coated gas ported
1mm oversize intake valves
race intake and exhasust valves
complete vavle job 85 degree radias intake seats
head ported for street
gsxr 750 starter clutch
back cut transmission gears new bearings
valves adjusted to 005 006
msd ignition
38 mm mikuni carbs.
All reciepts came out to over 6000.00
Heres some pictures of the beast. I plan to paint the body work like the number 5 bike. Its a 81 rg 500 but I like that paint scheme. Also you can see it has yosh pipe Dymag wheels brand new tires.
Sweet bike . As for the 1255cc pistons in a stock 1052 block , I've got the same thing with my gsxr 1100 where the engine builder used the 1052 block and punched it out and the sleeves that were used were .070" wall thickness where they go into the engine cases and .090" in the block . Thats way too thin . I've tore the engine down and will use a 1200 Bandit block and thicker sleeves to help deal with the heat and there will be more material to make sure the bores stay round . I will also use a bigger 91 1100 curved oil cooler .
My 01 1200 Bandit with the 1216 kit put out some decent heat with the small B12 oil cooler so I bet a 1255 engine would be a bit worse .
Any idea on what that 1255 engine puts out for HP ?
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I want to depart this world the same way I arrived; screaming and covered in someone else's blood
that would not be my ideal choice of displacement.
it will run hot
I agree, will be too hot on the track. My guess is you will lose 30+ HP from start to finish of say a 10 lap event. You will need to add at least a second oil cooler. Replacing the original straight cooler with a curved one as well as adding the largest second cooler you can fit will help and would be a good idea even for street use.
Javadog can confirm but, I think the Yosh superbikes used to run 3 coolers to try to keep the temps down and still gave HP away from start to finish.
Nice score, any idea what month Cycle World or colors of bike? It wasn't just black and red was it? I have some old mags from mostly 87 but a few from 86. Will let you know if I find a cover bike w/ an 86 1100 on it. I know I have mags w/ stock 86 1100's on the cover but not sure if any others. I have a couple w/ Yoshimura Toranodoes etc inside but not on cover. Who was the PO back in 86?
I got a Hayabusa oil cooler that I could put on it in the rear maybe? I just sold a curved one! Damn it. Ok so 2 oil coolers will help me make this bike not get hot at track days? The motor i has only 5000 miles on it. Im looking at the parts list it say Je pistons and Je 3.450 sleeves. Labor includes Deck cylinder sleeves, deck head work.
Nice score, any idea what month Cycle World or colors of bike? It wasn't just black and red was it? I have some old mags from mostly 87 but a few from 86. Will let you know if I find a cover bike w/ an 86 1100 on it. I know I have mags w/ stock 86 1100's on the cover but not sure if any others. I have a couple w/ Yoshimura Toranodoes etc inside but not on cover. Who was the PO back in 86?
I d say any Cycle World magazine with this bike with yosh rear sets and FCR 39 carbs on it. They were taking off the bike. The Dymags wheels are a give away too. Can you post picture of the red and black bike?
I got a Hayabusa oil cooler that I could put on it in the rear maybe? I just sold a curved one! Damn it. Ok so 2 oil coolers will help me make this bike not get hot at track days? The motor i has only 5000 miles on it. Im looking at the parts list it say Je pistons and Je 3.450 sleeves. Labor includes Deck cylinder sleeves, deck head work.
i run sandwich of two eom curved cooler
(head cooler with mod.oem line from rr89
never see 90-95 degree
Motorcycle: 05 B12 Daily, 05 Zuma PitBk, 91 1100 resting, 89 7/11 WERA V6HW Racebikes X2... parts and pieces to a few more...
Posts: 2,690
Re: Got my new track weapon. Old school Power!
Nice find! I remember a V/H bike that was mainly white with red/black stripes. I'd put an oil temp gauge on it for sure if you're going to run it on the track. Any idea what the compression is on it?
Nice find! I remember a V/H bike that was mainly white with red/black stripes. I'd put an oil temp gauge on it for sure if you're going to run it on the track. Any idea what the compression is on it?
There were 3 covers to my recollection, which showed several incarnations of the V&H bike(s). One cover had a small inset of the 1st gen 750, 2nd cover showed the 1st gen 1100, and then there was a rearview/lean shot of a 1st gen 750 on a third cover.
FWIW - in my opinion... I don't believe the bike in question is any of those three.
. As for the 1255cc pistons in a stock 1052 block , I've got the same thing with my gsxr 1100 where the engine builder used the 1052 block and punched it out and the sleeves that were used were .070" wall thickness where they go into the engine cases and .090" in the block 
. Thats way too thin . I've tore the engine down and will use a 1200 Bandit block and thicker sleeves to help deal with the heat and there will be more material to make sure the bores stay round . I will also use a bigger 91 1100 curved oil cooler . 
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