Honda BF40 Not idling right Cleaned carbs 3xs

[streethacker]

I cleaned the carbs 3times, replaced piolt jet, synchronized carbs, and replaced all intake gasket.. It still has rough idle. I am suspecting a air leak by throtle body but I am unsure anyone else have this issue or may know what it could be? Thanks!

 

[Tig]

Re: Honda BF40 Not idling right Cleaned carbs 3xs

What is your idle set at? It should be 950 RPM.
If you suspect an air leak, spray ether (quick start) in short shots at suspected leaks. If it gets sucked in, the engine will rev up.

 

[streethacker]

Re: Honda BF40 Not idling right Cleaned carbs 3xs

I already check vacume balance tubes, and suspect throttle valve. RPM increased with carb cleaner when i tried to spray the throttle valve but it is very hard to spray it because of tight space ...Was wondering if anyone else ran into this I have never seen it on a honda b4. and the RPM are set at 900-1000..Any other ideas?? Thanks!!

 

[Tig]

Re: Honda BF40 Not idling right Cleaned carbs 3xs

I've heard the idle circuit passages are very fine and block easily. How did you clean your carbs? Spray? Soak? Ultrasonic?
Mine idles and starts OK, but I think it could be better. I plan on disassembling them and using an ultrasonic cleaner next winter. Then I'll redo the set up and balance.

 

[streethacker]

Re: Honda BF40 Not idling right Cleaned carbs 3xs

Hehe I have tried all of the above it is definitely a air leak I think in the throttle valve but its just very strange I have never seen that b4 on this model,.. I have another boat that just came in same motor with good carbs I will be trying those out and Ill let you know!!