Replaced the Carb on the PK 1620 M20 engine

[MNGB]

The carb float has been sticking on the M20 for the last couple of years, engine starts right up but runs out of gas in about a minute so I use a small hammer, wrench or what ever I find handy and tap on the intake manifold and then it starts after getting fuel back in the carb and runs like a champ. I tried putting some 2 stroke oil in the gas and that seemed to help last winter and this past summer but this fall that stopped working. So yesterday and today I removed the carb and installed a new aftermarket carb I bought a couple of years ago, of course the China carbs are a bit different but I got it modified and installed and tuned, it was starting good and running good this afternoon but I couldn't get the max R's to go past 3300 which will work but would like to have gotten 35/3600. I will disassemble the OEM carb clean it and check it out to see what I can find with it

 

[4getgto]

Gary you think you could get the extra rpm with a little governor linkage adjustment somehow ? Or you think the carburetor just doesn't have what's needed ?

 

[Lily'sDad]

I have an Ingersol with the M14 engine When I got it, it had the original Walbro carb which has no high speed screw. I switched it for an original Kohler carb.

 

[4getgto]

I have an Ingersol with the M14 engine When I got it, it had the original Walbro carb which has no high speed screw. I switched it for an original Kohler carb.

So is that hi speed screw is used for adjusting rpm or fuel mixture ?

 

[MNGB]

Gary you think you could get the extra rpm with a little governor linkage adjustment somehow ? Or you think the carburetor just doesn't have what's needed ?

The carb is fine what I think is the problem is the throttle arm on the carb butterfly is shorter than the OEM carb so its not getting the travel needed,, I thought about making a new link from the governor arm to the carb but decided I see how it works as is

 

[MNGB]

So is that hi speed screw is used for adjusting rpm or fuel mixture ?

The high speed screw adjusts the mixture and fuel flow

 

[4getgto]

The high speed screw adjusts the mixture and fuel flow

I kinda figured.

 

[MNGB]

Went into the shop this morning and the M20 started right up but it has to be at about 1/4 throttle until it warms up or it wants to die, otherwise it good so far

 

[4getgto]

Went into the shop this morning and the M20 starter right up but it has to be at about 1/4 throttle until it warms up or it wants to die, otherwise it good so far

Assuming there's no low fuel mixture screw ? Seems like it wants to be a little richer.