142-F clutch catching and ringing at idle

Otto Neumann

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Make sure you take it easy on it till you get the a/f mix nailed down. Don't want to see it die before you have some fun.
Oh yeah! I personally found the screw to actually be quite sensitive, I once hit the sweet spot with like one tenth of a turn, before screwing it up during an erroneous diagnostic: I'll work my way out through quarters of turns, until it's still a tad rich.

I've been looking forward to replace the stock carb with a Dell'Orto PHBG 14mm carburetor to let this little engine breathe a little better, NT carbs are the equivalent of a Dell'Orto SHA 12/12, but the PHBG has a much more generous finesse degree in matter of tuning than the SHA and the NT themselves.

If I knew about the length of the carburetor stud interaxis, I'd braze a manifold myself.
 

DieselTech

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Oh yeah! I personally found the screw to actually be quite sensitive, I once hit the sweet spot with like one tenth of a turn, before screwing it up during an erroneous diagnostic: I'll work my way out through quarters of turns, until it's still a tad rich.

I've been looking forward to replace the stock carb with a Dell'Orto PHBG 14mm carburetor to let this little engine breathe a little better, NT carbs are the equivalent of a Dell'Orto SHA 12/12, but the PHBG has a much more generous finesse degree in matter of tuning than the SHA and the NT themselves.

If I knew about the length of the carburetor stud interaxis, I'd braze a manifold myself.
I got a dellorto 15/15 on my 49cc hausheng, runs great with a 71 jet. What measurement you need?
 

Otto Neumann

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I got a dellorto 15/15 on my 49cc hausheng, runs great with a 71 jet. What measurement you need?
MAN, I can't believe it! I wouldn't ever expected to find somebody using that combination, especially with a 15mm Dell'Orto!
Is it an SHA model right? Only SHAs has the 15/15 nomenclature, whereas PHBGs has only one number; I do believe:

That 15/15 has a considerably larger airflow than the stock carburetor or the NT carb, it must be a very responsive engine!

I required to know the spacing between the carburetor studs, I'm aware which the right stud is approximately 3 degrees lower than the left one, using the middle of the interaxis as reference; I took the opportunity to ask because we are in the thematics, despite I could take the carb off myself: The house and the parents are taking away all of my freetime, and for my dearly sanity, I'd better not go fiddle in the garage this weekend.
 

Otto Neumann

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Well get him that too. lol. He probably asked about the offset to in the post.
The right stud is about 3 degrees lower than the left one, assuming that the bolts are M8 sized, I could compensate a certain margin of error by drilling 8,5mm holes and countersink them, having a 3D printer, I can quickly produce non functional mockups to test things out before moving on aluminium, OxyPropane torch and filler metal.
 

Karl Snarl

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The right stud is about 3 degrees lower than the left one, assuming that the bolts are M8 sized, I could compensate a certain margin of error by drilling 8,5mm holes and countersink them, having a 3D printer, I can quickly produce non functional mockups to test things out before moving on aluminium, OxyPropane torch and filler metal.
Just trace the gasket on a fender washer, cut it out, and slap on the tube or whatever you are making the manifold like. Saves ya a shoot to of time
 
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