Hitchcocks Forum

Hi again,

Got a small issue with idleing on my 350.

I've stripped and rebuilt the carb, really good clean, new gaskets and seals throughout. I rejetted it based on Hitchcocks recommendations as I fitted a bell mouth filter and it already had what I think is the Megaphone silencer fitted. So the jetting is now is 105 main, 27.5 pilot and a standard needle. The bike actually accelerates really well and cleanly, pulls strongly etc. The only issue I seem to be having is a getting a good clean idle.

It doesn't smoke particularly badly and it starts up very easily but it seems to have a mind of its own if it idles well or not. It will either idle fine or it will starg idling fast or it will die then I need to either choke it or turn up the idle speed screw to get it to restart. I seem to be constantly tinkering with the idle speed or air screw to get a good idle.

Also I noticed today that it spurted out some fuel from the bottom of the carb about 3 times. Just 3 squirts of fuel then it stopped.

I'm guessing this could be an issue with incorrectly adjusted or stuck float bowl and the pilot jet is rich?

I'm guessing this could be an issue with incorrectly adjusted or stuck float bowl and the pilot jet is rich?



Yes, and or a choke not seating fully, or a leaky seal around the top of the choke shaft..?

Hi Si81

I've a similar set up with a 100 main- which I'm changing up to 105 at the weekend to (hopefully) eliminate the 3/4-WOT misfire.

With the 27.5 pilot, I need to be at least 3 turns out on the mixture to weaken off sufficiently, so I may even go back to trying the 25 and see how I get on.

Float level and needle valve definitely a good place to start.

Another vote for float height.