Why does it run great only without filter?

Barry (Bob) Brown /

Hobbit, stock PA50II carb/intake - In trying to tune, I down jetted from 90 to 86, which helped but it still 4strokes a bit till it gets hot after few miles. I thought i'd look at the filter box but it looked ok. I dont have the snorkel in cause its a PA50I, but I took it for a ride without the filter box and it ran awesome, great power and hit 45 immediately? I took some pantyhose and threw it over the carb intake to avoid sucking anything into it as a test and it runs great - what do you think is going on?

Re: Why does it run great only without filter?

Too rich or clogged filter

Re: Why does it run great only without filter?

Down jet more?

Re: Why does it run great only without filter?

45 on a pa50I, uggggh..... bs.

Re: Why does it run great only without filter?

> pat splat Wrote:

> -------------------------------------------------------

> 45 on a pa50I, uggggh..... bs.

It's a kitted pa50I with a pa50ii intake, TJT, new bearings and seals. It's not BS, it's just barely a pa50I now haha

Re: Why does it run great only without filter?

i see, check that your choke aint hung up on your wires fuel line

Re: Why does it run great only without filter?

I tend to ditch the stock 40 year old dense ass rotting foam and cut a piece of uni foam for the filter box, oil it and viola

Re: Why does it run great only without filter?

Needs to be cleaned and made less restrictive. Insufficient air flow is hindering the pressure drop, thus intake of the carb. Down jetting likely allowed you to suck proportionally limited mix with the limited air, and allowed for combustion; I wouldn't run that for too too long. With the right amount of air, you may be a touch lean.

But this happens; little soap and elbow grease on the filter, add some new oil after - good to go. Or just get new foam. Either way.

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