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CB500 Four 1976- some issues!

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exelbyt:
Hello all i need your advice.

I have a 1976 Honda CB500 Four. I bought it three or so years ago from a fellow member of this forum called steve. I have got the bike through a mot after being sorn and been sculpting it into what i want it to be. (See photos). The main change is that the tank, seat and handlebar set are new and i have fitted yamaha xj550 maxim wheels and sprocket (which is noticeable larger than the original 34t Honda one)

Here are some issues i am now encountering;

1. The worst bit- the engine revs uncontrollably. At first it would only do this in neutral but recently these revs are actually driving the bike.  This makes cornering difficult.  I have checked the carbs and the idle screw.  I think air must be getting in somewhere between the carb exit and the valve. Thoughts?

2.  The large sprocket from the xj550 is too big for the engine and gearing. It accelerates but has not top end.  Does anyone know of a sprocket which would fit the wheels (xj550 maxim) 5 bolts but be closer to 34t?

3. In braking the front forks are compressing (as usual) however the front wheel is turning to the right (sligt feeling) . (Disc and caliper are on the left) what does this mean?

All any any advice are very welcome!

Regards


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Chris400F:

--- Quote from: exelbyt on April 24, 2016, 07:16:40 PM ---2.  The large sprocket from the xj550 is too big for the engine and gearing. It accelerates but has not top end.  Does anyone know of a sprocket which would fit the wheels (xj550 maxim) 5 bolts but be closer to 34t?

--- End quote ---
Increasing the front sprocket size would have the same effect as reducing the rear and may be easier to achieve, assuming no problems with clearance in the casing.

K2-K6:
For the front wheel turning right under breaking I'd first look at the pinch bolts of the top and bottom fork yokes to make sure they are tightened properly, then also how the spindle is clamped to the forks. Many spindle clamps go on one way only to make them secure when tightened.

Aly-b:
1.Could the throttle cables be fouling under the tank?

florence:
With regard, to the front forks flexing I notice you do not have a mudguard so there's no fork brace.  I don't know how much difference it makes because I haven't ridden one without a mudguard.

Also, if you are using that wheel, is it possible that the disk is out of alignment with the caliper?

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