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8E main Jet

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8E main Jet

Post  kerabo on Sun Dec 04, 2016 5:26 pm

Has anyone that has an 8E engine with the S25 carb fitted know what size main jet they have fitted. I am building an engine that has a 120 fitted. This looks a very large hole so just asking as I go.

Thanks Ken
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main jet

Post  piston 197 on Sun Dec 04, 2016 6:04 pm

Yes 120 is correct for a Villiers 8E whether fitted with a S24 or S25, if the hole looks bigger, maybe someone has drilled it out ?
JH
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8E Jet

Post  kerabo on Sun Dec 04, 2016 6:37 pm

Cheers John
I will replace with the same or very close just to be sure
Regards Ken
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Re: 8E main Jet

Post  Brentis1 on Sun Dec 04, 2016 11:07 pm

Hi Ken,

I just checked my S25 on an 8E and it definitly has a 120 main jet.

Cheers

Brent

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Main Jet

Post  kerabo on Mon Dec 05, 2016 8:52 am

Thanks to all
Will order one.
Regards Ken
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Piston 97 new Logo

Post  peter@dunfordconstruction on Mon Dec 05, 2016 9:27 am

Hi John.

Is that a new bike Fulmar trials???

Peter

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Re: 8E main Jet

Post  Andrewwoey on Thu Dec 08, 2016 8:35 pm

Mine seems very boggy with the 120 in it. I will do some experimenting with the jetting, in the summer.

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Main Jet

Post  piston 197 on Thu Dec 08, 2016 8:41 pm

Andrew it is unlikely to be the size of the main jet, the full diameter of the main jet is not utilised until 3/4 to full throttle opening, pick up from tick over to 1/4 throttle is controlled by the pilot jet, slide cut away and the taper of the throttle needle. so if it is bogging down it is very unlikely to be influenced by the main jet size. If it is not revving out cleanly from 3/4 to full throttle opening then you main jet may well be the culprit

JH
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Re: 8E main Jet

Post  Andrewwoey on Thu Dec 08, 2016 8:52 pm

piston 197 wrote:Andrew it is unlikely to be the size of the main jet, the full diameter of the main jet is not utilised until 3/4 to full throttle opening, pick up from tick over to 1/4 throttle is controlled by the pilot jet, slide cut away and the taper of the throttle needle. so if it is bogging down it is very unlikely to be influenced by the main jet size. If it is not revving out cleanly from 3/4 to full throttle opening then you main jet may well be the culprit

Thanks Piston. Yes, i understand the way the carburetor works.
I need to go through every thing. Need to check the timing aswell as going through the carb. I enjoy modifying and setting up 2 strokes. First one i tuned and set up was when i was 15. Now 46 and still learning. This is my first british bike and got more to learn Very Happy


JH

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Re: 8E main Jet

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