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High revs

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watty51:
Hi,

Any ideas of what causes this problem I encountered on my CB350F today.

Sunny day took bike out, after about 3 miles of running fine the revs rose to 4000rpm and just stuck there. I pulled over to see if there was issues with cables/throttle etc but everything was working fine. Left bike turned off for about 10 mins. Started the engine and it went straight to 4000 revs again ?

The bike has been starting fine on the choke and had been idling fine when stationery. I must say this is the farthest the bike has travelled so not sure if it was getting to hot. The run was on country roads with no traffic.

Cheers

kevski:
Air leaks between carbs and head head.

Rob62:
What happened next? Did it settle down, could you ride it home? Is it ok now or still the same? We need more info. Sounds to me like something has happened to the throttle control cables, either  snagged or not located properly in the carb or the throttle tube.... were you negotiating a turn have you routed the cables correctly. Apologies if you've  already checked all of this...

Trigger:

--- Quote from: watty51 on September 02, 2017, 08:38:50 PM ---Hi,

Any ideas of what causes this problem I encountered on my CB350F today.

Sunny day took bike out, after about 3 miles of running fine the revs rose to 4000rpm and just stuck there. I pulled over to see if there was issues with cables/throttle etc but everything was working fine. Left bike turned off for about 10 mins. Started the engine and it went straight to 4000 revs again ?

The bike has been starting fine on the choke and had been idling fine when stationery. I must say this is the farthest the bike has travelled so not sure if it was getting to hot. The run was on country roads with no traffic.

Cheers

--- End quote ---

Make sure you have non resistance spark plugs fitted ;)

watty51:
Thanks for the replies.

The bike didnt settle down after the high revs but luckily i wasnt far from home so pushed the bike home. Having checked all the cables they are all new and correctly routed ( on both left and right lock) so don't think that's the problem.

I will check for leaks as suggested, but the post from Trigger is interesting.

I have non standard ignition coils form DS, and I am using NGK D8EA spark plugs. ( are these spark plugs non resistance/ compatible with the coils from DS  ?

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