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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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  #11  
Old 05-15-2017, 03:09 AM
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Jakobi Jakobi is offline
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Just checked details again, given you've been running a 165 main with the N1EF you'll probably have no issues with a 175 main with the N3, or probably even down as low as a 170... based off your current main being OK.

The H diameter might be a bit rich still though, and especially with a 40 pilot. 38 may be closer.

Waiting on the NEDJ should get you closer quicker, I think.


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  #12  
Old 05-16-2017, 08:14 AM
rossi rossi is offline
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Quote:
Originally Posted by Jakobi View Post
Just checked details again, given you've been running a 165 main with the N1EF you'll probably have no issues with a 175 main with the N3, or probably even down as low as a 170... based off your current main being OK.

The H diameter might be a bit rich still though, and especially with a 40 pilot. 38 may be closer.

Waiting on the NEDJ should get you closer quicker, I think.
Thanks Jakobi. You are a legend.

I'll give it a couple more days for the NEDJ to arrive then use the N3CH if it doesn't. I have mains in 172 and 170, pilots in 42 and 40 so should be able to find something that will be an improvement on the N1EF for the weekend and swap for the NEDJ when it arrives - sods law says this will be the day after the race. I doubt I will be spending much time on WOT, if any, so if the main is a size off optimum I should be OK.
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Old 05-25-2017, 11:05 PM
rossi rossi is offline
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Well the NEDJ arrived before the enduro and I fitted it on #2 with the 42 and 170 but quickly swapped back again. It started fine and the initial throttle opening was crisper but beyond 1/4 throttle the engine would quickly foul the plug and stop running. I didn't have time to play with it but I suspect it wants the needle dropping to the 1st clip and a smaller main.

It seems that my bike needs a leaner jetting. I still have to set the squish, which is probably a bit wide, so I don't know whether this is the reason.
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  #14  
Old Today, 09:43 AM
rossi rossi is offline
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I think I might have just identified my problem. The original owner was insistent that the bike used to run beautifully with the current jetting so I started wondering whether there might be another problem.

It has a new piston, the dents blown out of the exhaust and silencer repacked so that was all ruled out.
I got a bit more analytical about how the bike was running - bogging at low revs but clearing higher up, regardless of throttle opening, suggesting it could be something other than jetting.
I had an idea, did a bit of googling which supported it, then pulled the reeds. Bingo! 2 of the petals are chipped along the edge - just enough to affect the seal and allow a little leakage back to the carb at low air velocity.
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