SOHC.co.uk Forums > CB350/400

High revs

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Trigger:
The plugs are non resistance but, have not got a clue about the Sliver coils . You will have to check for leaks .

watty51:
What is the best way of checking for air leaks between carbs and head as suggested.
I've had a good look and everything still looks secure.

hairygit:
Spray some carb cleaner or easy start or even wd40 around all the joints from carbs to engine while its running, if there's a leak, it will get sucked in and the revs will increase slightly for a moment. If it's only happening when hot, it could be the o rings in the alloy intake stacks where they bolt to the head, the leak being caused by hardened o rings not taking up the expansion of the metal.

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watty51:
I sprayed some wd40 around all the carb joints as suggested, but the engine revs didnt increase.

The idle was around 1200 which is what it should be so could be the o rings when the engine is hot as suggested by Hairygit.
Will give that a go next weekend.

Does the fuel/air mixture setting have any reference to the idle ? also my Clymer Manual is saying 1.5 turns to 2 turns out, seems a lot ?

Decided to get the ultra reliable  1996 VFR750 out for a Sunday ride. Lovely

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