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Old 08-21-2008, 03:40 AM
wildemere wildemere is offline
Motorized Bicycle Elite Member
Join Date: Feb 2008
Location: Newcastle
Posts: 269
Default Re: Need advice tuning PHBG carby

I am also trying to tune one of these to a 70cc HT.

I still have some way to go yet. It runs with a .60, but rough and rich.

I think I still need a smaller idle jet as the screw has little effect.

Also part #3 needs to be a "2 stroke" atomizer, the copies are usually fitted with the wrong 4 stroke part.

see the dellorto documentation for more info.

it is possible to solder up the holes in the wrong part though.

Also watch the engine end of the carb. the idle circuit vents there and can also suck air if not sealed with a rubber boot. Additionally its easy to block this outlet when fitting the carby on the manifold too far.
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