SOHC.co.uk Forums > CB750
CR750 Replicas
Phil:
Woodbridge Sprint? Thundersprint? Northwich? Am I missing something? Where will you be on May 10/11th Sam?
Phil
SamCR750:
--- Quote from: Phil on March 04, 2008, 09:24:51 AM ---Thanks again Sam. I will be there if at all possible. Q96 - do you use 31mm or 29mm Keihin CRs? I am told to use 29s as my first engine will use standard con rods and therefore won't be able to rev high enough to enable the 31s to work. This is a "parade" engine - I am planning a Wiseco 836cc kit, Dynoman/ Megacycle cam, stronger valve springs and some mild headwork and the CRs. I am tempted to try a standard'ish F2 head? I have plans for engine 2 which I want to keep 750 with a light crank, Carrillos, Nova box etc. Q95 ...
Cheers
Phil
--- End quote ---
Phil, the 31s work great with stock rods. If you go with Wiseco 836 forged pistons, the Megacycle 125-65 camshaft, and a good port job with decent valves, the motor will make more power than the factory CRs without putting undue stress on the rods as the rev limit will remain stock at 8,500rpm. what you will have is a motor with enough torque to make you think twice about cracking it wide open in the lower gears. ;D ;D ;D ;D ;D ;D
Sam. ;)
SamCR750:
--- Quote from: Phil on March 04, 2008, 10:05:24 AM ---Woodbridge Sprint? Thundersprint? Northwich? Am I missing something? Where will you be on May 10/11th Sam?
Phil
--- End quote ---
The Sprint meeting at Woodbridge is on the 10th and 11th May. We will run on the Saturday and if we have no problems and the bike achieves what we expect from it, we will leave it at that and head home for the Thundersprint at Northwich on the Sunday. If we have any problems we will stay at Woodbridge untill we get the job done.
Sam. ;)
Phil:
Q92 and Q93 (don't want to overload Sam!) - I am hoping to race/ parade this replica in CRMC events and the rules are strict and confusing! I need to get alloy rims put on the standard hubs. Anyone know A) the max rim size that is allowed (and that the swinging arm can accommodate); B) the best tyre size/ make? I am also using the standard stainless discs because I can't find steel replacements (anyone know a supplier?). The s/s discs weigh a ton and say on them that the minimum thickness is a wopping 6mm! My s/s NSR discs say maximum thickness is 3.5mm. Does anyone have experience of machining discs? Does anyone know where I can get the discs drilled? Thanks!
Phil
SamCR750:
Can't help with either there Phil, we stuck with stock rim size (WM2/WM3) and stock brake discs.
Sam. ;)
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