I have the PCP bare head on it. I finally got a chance to fire it up yesterday (I wanted to take it to the dunes this weekend but will be doing so today it looks like.) As I cleaned the carb after adding my new power jet kit I discovered the Pilot air screw was missing the oring and the little washer that rests against the oring. I made a washer to fit but had to go to four different places before I found such a special o-ring to fit down in there. I do not think it even had it when I tore it apart butI could have missed it and not seen it fly out when using compressed air to assure clean passages. Its got it now and that what matters. I ran it yesterday without the seat and safety harness out of it so I could get to things and see better. It was just the initial heat the piston cycle. After that I let it completely cool and the compression test (throttle jacked wide open) revealed a solid 160 PSI. I ran out of gas so I am gettign ready to go now and get some more for it. SO far it seems good and the plug looks better than it ever did before so I am hoping.
One thing that may be normal or not. I have a large clear fuel filter going to the carb (see pic below) When the thing is running it seems the fuel pump can barely keep any fuel in it at all. Easily less than a 1/3rd full all the time. (My lean out condtion??) The only time the filter gains volume in it is when the
motor ((
Internal Combustion Engine ? )) is shut off then the trickle down effect fills it some. I would think the fuel pump would fill it easy as the overflow tube up top is (I thought anyways) there to take excess fuel back to the tank. But it should be filled almost up to the return tube?? I checked the fuel pump once before and am going to recheck it according to the book. Hoser if you have a better way to test these pumps I would be willing to test it that way too. Bear in mind that I of course did not rev the motor (( Internal Combustion Engine ? )) to much (nearly none. Just a couple blips here and there to vary Engine speed a little. Very little idling. Usually above idle a little) That said the pump might pump a lil more with more rpms more the carbs gonna go thru a lot more. (I am not convinced of this as the pulses will be faster but not as "pronounced" thus giving less input to the pumps diaphram? Or am I wrong about this?) I was worried as I have heard that the paper filter would not allow the gas through it with gravity feed but the first fuel into it went right thru till the carb got a drink and the Engine fired. Bill
Oh yeah. One other thing that delayed me a little was I had to get a reed spacer and install it. (Yah I retested for vacuum and positive pressure in the crank after I changed it) When I was modding the carb for the power jet kit I noticed the bottom of the FRONT of float bowl when the choke circuit is was wearing from rubbing on the starter. It was not a problem with the stock manifold but with the new larger CR250 manifold that Hoser guided me to for easier fitting of the larger 41mm carb. The new manifold is a straight shot into the reed cage but it does hold the carb a little closer to the cylinder and thus the carbs fuel bowl was bumping the starter with motor (( Internal Combustion Engine ? )) vibration. There was enough wear that had the motor (( Internal Combustion Engine ? )) not had another issue that cause me to go into it again it might have worn through with a couple hours running. Thanx Bill