jetting question on holy moses. ...

[Drew-21]

This past weekend my engine was very slow on the start. Had several people tell me too check the jets. What should the jetting be for a #400 super heavy? I'm asking about both jets too so I can get it right.

Thanks

 

[youngengines]

I would figure .024 , .039 (or .038 high)

 

[flattop1]

That and look for possible blockage

 

[W5R]

Adjust the low speed/pilot jet to help you tune the low end of the power range, and adjust the main to help with the top end of it. I would say .22 low speed jet with a .39 main. I have a holy moses also and it took my engine builder a few tries playing with the jetting to get it figured out where it works best, but you also have to look at what cam/timing you are using when you choose jetting, not just the class your running or engine.

 

[alvin l nunley]

Assuming it was OK before, with the jets you now have, I’m going to guess something else is wrong.
The first thing I would do is check the compression. Then I would do a leak down test. After that, I would go through the clutch.
Now there is the possibility that you have had a big change in air density, so that could throw the mixture off.
Of course I’m just guessing. You didn't say what jets you now have, and knowing that might help.

 

[Yakattack]

Did you check your clutch?

 

[DynoDon]

If you were only have a problem on the start and nothing else, it wasn't your jet. I would be looking at the clutch like Yakattack said