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bultaco

Carb tweeking after Hot Cam install?

6 posts in this topic

I installed an autodecompression exhaust cam in my 1999 WR 400F. Easy now to push starter down...just that the prior carb settings are not quite right...Could the new piston pressure/air/fuel mixture while starting require new settings? It takes about 30-40 kicks to get it started...same once warm and trying to start again after shut down. A remote fuel screw was installed on the carb at the same time...not sure if it is seated exactly as the prior screw.:crazy:

Thanks for any help.

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If the problem does not care if the bike is warm or cold, I suggest first confirming valve clearances are correct. Confirm them, do not assume.

Then, I'd confirm the spring/washer and oring are on the fuel screw, then I'd try the original one.

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I didn't have to make any jetting changes when I went to the hot cams auto decomp cam on my 426. Agree with William1, check the clearence. Hard starting as you describe is usually a valves hangin open a bit issue...

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Far as I know, that screw is supposed to be OK. I'll ask a dumb question that has to be asked. When you took your old screw out, you removed the spring/washer/oring, put them on the new screw, right. I ask because sometimes they fall off and guys neglect to have them, in other instances, the oring has remained behind up in the hole and a second one ended up being installed.

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