Does this look to lean

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dave411
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Mon Apr 17, 2017 5:15 pm

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Its a 198 Mugello,26mm Delly,GP 50 pipe.
Main 100
Atomizer AV266
Needle x7
Slide 45
Timing 23 static,Varitronic fitted.

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garry inglis
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Mon Apr 17, 2017 5:48 pm

how many miles on that plug it looks bran new or very lean

dave411
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Mon Apr 17, 2017 6:08 pm

garry inglis wrote:how many miles on that plug it looks bran new or very lean
Hi Gary,its done about 80 miles.


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garry inglis
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Mon Apr 17, 2017 6:13 pm

ive just been in my shed to look at my book and ive got this main 118 /120 av266 2nd clip x7 pilot 50/55 slide 40 choke 70 i think you want try one change at a time and keep doing plug chops but better to be rich than lean

dave411
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Mon Apr 17, 2017 6:48 pm

garry inglis wrote:ive just been in my shed to look at my book and ive got this main 118 /120 av266 2nd clip x7 pilot 50/55 slide 40 choke 70 i think you want try one change at a time and keep doing plug chops but better to be rich than lean



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dave411
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Mon Apr 17, 2017 6:49 pm

Thanks Gary.Will try a 120 main first.Will report back in a few days.
Thank you.


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mick1
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Mon Apr 17, 2017 7:10 pm

Try putting an older plug in (oily....ish) and see if it changes colour.

If your running in are you marking throttle positions and doing plug chops at different throttle positions ? If your running-in you might not be coming onto the main jet and you could be lean elsewhere (pilot, needle, etc).

dave411
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Mon Apr 17, 2017 7:43 pm

mick1 wrote:Try putting an older plug in (oily....ish) and see if it changes colour.

If your running in are you marking throttle positions and doing plug chops at different throttle positions ? If your running-in you might not be coming onto the main jet and you could be lean elsewhere (pilot, needle, etc).
Thanks Mick.Yes,I am running in,but have more oil in the mix.25:1.
It is stuttering mid range,but when it gets the revs up it flies.Havent done many plug chops to be honest,will just try a bigger main and see what happens.


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mick1
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Mon Apr 17, 2017 7:54 pm

get some masking tape and mark your throttle 1/8. 1/4. 1/2. 3/4

Run about a mile holding at the position then cut the engine and check the plug.

This will help identify if your, pilot, needle (+ clip position), slide, atomizer and main jet are ok

dave411
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Mon Apr 17, 2017 7:56 pm

mick1 wrote:get some masking tape and mark your throttle 1/8. 1/4. 1/2. 3/4

Run about a mile holding at the position then cut the engine and check the plug.

This will help identify if your, pilot, needle (+ clip position), slide, atomizer and main jet are ok
Ok,will give that a go.
Thank you.


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