



Not quite sure what you mean by keeping the stroke the same, RD400 rod is 115 mm. I'd use a SIL GP200 crank, they look crap but by all accounts they're very good if you use a Yam rod with a top quality big end bearing (RD500).rocho68 wrote:, oh and by the way if anybody was fitting a jap conrod what crank would they use a maz or mec and what rod as i want to keep the stoke the same .....rd400 rod ?
corrado wrote:Not quite sure what you mean by keeping the stroke the same, RD400 rod is 115 mm. I'd use a SIL GP200 crank, they look crap but by all accounts they're very good if you use a Yam rod with a top quality big end bearing (RD500).rocho68 wrote:, oh and by the way if anybody was fitting a jap conrod what crank would they use a maz or mec and what rod as i want to keep the stoke the same .....rd400 rod ?
surely your port timings are built around the conrod lenght and stroke a longer rod will alter these and even if you use a piston with a lower compression height to compensate you may have add a packer or recess the head and cut the bottom of the piston to suit which to me sounds like a ball ache better to decide what piston stroke rod before tuningrocho68 wrote:you have to see the workmanship in this barrel and casings !!!! the transfer area must be something like 250% bigger and This is only the start , build it up dyno it , run the summer then straight to plan b ...................................... cut through the barrel and wrap 2 auxillary exhaust ports either side of the main one , also jl4 , 7 plate clutch etc , oh and by the way if anybody was fitting a jap conrod what crank would they use a maz or mec and what rod as i want to keep the stoke the same .....rd400 rod ?
micks number is 07802896103 , give him a call if you want the best !!!!!!!
Thank you Lee for the mention, let's hope it goes well and does what it says on the tinrocho68 wrote:hi guys , thought id share a few pictures of the work that mick abbeys being doing for me , absolute genius and his work is not to be underated , ive seen the work of some so called scooter "tuners" were opening up the exhaust port is all they do !!!! anyway back to the imola , welded casings by myself , then hours of sculpting the casings to look original , then off to mick who lowered the porting , opened up the transfers to the max , and adding three boost ports including two that wrap round the barrel the same as the rb !!!! watch out ts1 boys my little imola will eat you for breakfast!!!