Glock, you may check out ebay for a PZ22C carb for your bike(s). Its a clone of the 110's carb, can be had for $20 or so, and will work on any of you bikes 90 or 110 if you decide to swap your carb for any reason (ie carb problem on the bike you want to ride that day, testing purposes, etc). On a stock 90 it may cause the bike to have a barely noticeable decrease in throttle response (mostly off idle and when the throttle is quickly snapped to wide open) but it'll be more lively once rolling and in the upper rpm's since its a bigger carb (22mm vs stock 19mm port size). You could get a replacement PZ19 but it smaller than stock for the 110 (which even if rejetted for that bike would kill its power at the top end thus further disappointing you) and they don't have provisions for hooking up two fuel lines at tge carb.

On the one dubbed Barney try spraying carb n' choke cleaner, Axe, or any other aerosol spray product you have handy, around the manifold where it mates to carb and motor. If you haven't done this already. Any change in engine rpm means vacuum leak and new gaskets are needed. A tiny vacuum leak may cause it to hunt at idle but under load appear to operate normally.

And so you know i plan to show my rebuilt motor no mercy. It won't be babied and if the clicking first gear gives out (or the engine/top end though I doubt I can destroy that part of it), then I'll swap in the lifan 125 I just got off of fleabay. Picked up one with the dress up kits because all the others are now 600 bucks with shipping and this one was still $350 with shipping (50 more than what the regular semi auto kick only 125's were before lifan quit importing them and their price doubled).

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