Welcome to Club SAITO !

Join Date: Oct 2006
Location: Austin,
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Thank you very much!
The sound on the video is off, compared to the actual sound which is waaaayyy more sweeter. hahaha. It sounds like a song that i will listen over and over again. hahaha, sorry i'm just happy with it. Thank you, Jesse, for selling it to me. i love the balloon popping sound at low idle.
The sound on the video is off, compared to the actual sound which is waaaayyy more sweeter. hahaha. It sounds like a song that i will listen over and over again. hahaha, sorry i'm just happy with it. Thank you, Jesse, for selling it to me. i love the balloon popping sound at low idle.

Join Date: Oct 2006
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I have one question, but i will have to make a video i think for you to understand to see if i have a problem or what, so when is running, the right head burnt fuel is coming out of the valve housing tru the top screw, I took the valve cover off and inspect and everything looked fine and tight to me, but i have fuel coming out of there and not the other head and i don't even know what it could be.
Any idea of what it could be, opinions are really appreciated.
Any idea of what it could be, opinions are really appreciated.

I have one question, but i will have to make a video i think for you to understand to see if i have a problem or what, so when is running, the right head burnt fuel is coming out of the valve housing tru the top screw, I took the valve cover off and inspect and everything looked fine and tight to me, but i have fuel coming out of there and not the other head and i don't even know what it could be.
Any idea of what it could be, opinions are really appreciated.
Any idea of what it could be, opinions are really appreciated.
Last edited by Glowgeek; 09-20-2019 at 10:28 AM.


The 100 twin has a check valve controlled, cam driven diaphragm pump. It can develop a good head of pressure if there is a blocked outlet. Under normal conditions, there should be very little leakage at the covers.

Pressure to where? Never owned pumped engine, I assumed the pump pressure went to the fuel tank and the engine was normally vented. No?



Not to tank.Not recalling the routing right now. I don't actually recall if the pressure or intake side went to case. Without venting I suspect blowby on an engine not yet broken in could be considerable as well.
Update,It is in fact pressure fed to case.
Last edited by Jesse Open; 09-20-2019 at 12:04 PM.

Ooooh I see, it's not a boxer style engine. With both pistons traveling in the same direction it sure enough would not develop enough case pressure to evacuate excess burnt fuel/oil from the case. The pump solves that. Very interesting, thanks.

Could it be the pump is dry and needs primed to start working? That happens with some 2 stroke gasser carbs when they're left dry all winter.
EDIT: Nevermind, I forgot it's an air pump.
Maybe one of the pump valves is stuck open or you may have to spin the engine with a starter to feel any pressure out of the vent.
EDIT: Nevermind, I forgot it's an air pump.
Maybe one of the pump valves is stuck open or you may have to spin the engine with a starter to feel any pressure out of the vent.
Last edited by Glowgeek; 09-20-2019 at 01:43 PM.

My Feedback: (1)

try removing the nipple to see if something is blocking the vent hole on the inside of the case,
another thing, you can try priming (with oil) the front of the case thew the vent hole
edit, with all this twin talk I had to get my 100 Twin out and put it on the desk by my monitor
Jim
Last edited by the Wasp; 09-20-2019 at 06:52 PM.

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I wouldn't run it much if you are not getting oil out of the front vent, you do not want to destroy that front bearing and cam. and I am wondering if you are getting more oil in the rocker cover because the oil is not getting to the front, here are a couple things to try,
try removing the nipple to see if something is blocking the vent hole on the inside of the case,
another thing, you can try priming (with oil) the front of the case thew the vent hole
edit, with all this twin talk I had to get my 100 Twin out and put it on the desk by my monitor
Jim
try removing the nipple to see if something is blocking the vent hole on the inside of the case,
another thing, you can try priming (with oil) the front of the case thew the vent hole
edit, with all this twin talk I had to get my 100 Twin out and put it on the desk by my monitor
Jim
Im going to try that

My Feedback: (1)

guys, I think I have decided on a name for my VQ P-40, "Bad Joe", as in G.I. Joe. I was thinking of adding "With a Gun", but I'm not sure on that, it seams a bit too long, so at least it's Bad Joe for sure.
what you think ??
Jim
what you think ??
Jim