SOHC.co.uk Forums > CB500/550
is it possible to restrict an f2 to 33hp
MIKE550/4:
been taking lessons on a 125 ,if i pass my module 2 , i have this f2 ready to go
i also have a 125 but would like to take the 550 out every now and again just to get some experience on it
purely asking to see if it possible
SteveD CB500K0:
In theory you can restrict anything by merely restricting the amount of air that flows through the inlet.
As the 550 only made 50bhp when it was new, restricting to 33 should be fairly easy.
Easy that is if you have access to metal fabricators. You'd need restrictor plates for the carb inlets.
Then you'd need a "certificate" from a dyno to prove the output.
Then you'd need to convince your insurance company that it is kosher.
Is it 33 at the rear wheel? It's probably not far off that now!
MIKE550/4:
well no access to metal fabricators, a forum member on here has told me a dealer could possibly use a "kit" to restrict the carbs
and i take it you would then get a print out as evidence to prove this ? ie dyno results
SteveD CB500K0:
These "kits" didn't exist 30 years ago and I don't suppose anyone has made model specific kits foir these bikes. Hence the DIY approach.
K2-K6:
Just make a throttle cable with a longer inner cable so the carbs won't open all the way, put it on a dyno to get it checked for output and bosh, Bob's your restrictor.
In all seriousness if "a kit" consisted of a purpose made cable to restrict the maximum output to the legal limit and could not be bypassed in normal use plus a verified output map, then it should conform and not require a whole setup of jets etc to run properly.
Just a latteral thought.
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