SOHC.co.uk Forums > CB350/400

Won’t rev above 3k under load

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Golfcarmad:
Hi everyone.
Finally got her out of conservatory onto the road.
She started instantly,revs on stand around the clock.
Off I went up the road and maximum revs is about 3k.
Looking for suggestions on where to start investigating first?
Carbs/timing/?????
Thanks for any and all suggestions
Paul

Johnwebley:


   what colour are the plugs??

   is the aircleaner old and dirty?


   is the auto advance free and working?

Golfcarmad:
No air cleaner.
Not original exhaust silencer.
Just pulling plugs now.
Will advise-thanks.

Golfcarmad:
If you said 1 was lean and 10 was rich with 5 being perfect colour of plugs.
Mine are all 4 very slightly lean.

K2-K6:
It sounds leaner than the plugs suggest. 

If you've not changed anything form standard to run it without filter etc.  Have you got no airbox fitted either?

The running described (full revs no load condition) suggest that ignition is ok or reasonably without problem.

Also suggests that it's just not rich enough to get it to accelerate under loading situation,  try pulling the choke up a little when it reaches 3000 to see if it will get it going further. If it improves that would point to it definitely being lean.

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