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Workshop => Carburetor, Intake, and Exhaust => Topic started by: hondaman77 on August 12, 2013, 10:56:43 PM

Title: whats next after break-in jetting?
Post by: hondaman77 on August 12, 2013, 10:56:43 PM

Guys,

i have a 38mm A/S on a ported OEM cylinder. i just finished my break-in period. bike runs pretty good but i can tell its rich due to the sponge on the silencer (Allen from CT set it up and said it would be a little fat). what are my next steps/sizes to test this weekend?

currently: DGJ (third clip), 50 Main, 175 Pilot. riding at sea level.

Thanks.

Title: whats next after break-in jetting?
Post by: atv fan 28 on August 12, 2013, 11:05:46 PM

i would do some plug chops... And go from there

Title: whats next after break-in jetting?
Post by: hondaman77 on August 12, 2013, 11:13:42 PM

wasn't sure if i should make an adjustment/change something then do a plug chop since i know it was setup rich???

Title: whats next after break-in jetting?
Post by: fearlessfred on August 13, 2013, 12:10:33 AM

I would only trust the plug to tell me what jetting I needed on a fresh motor

Title: whats next after break-in jetting?
Post by: jcs003 on August 13, 2013, 07:31:16 AM

do you have a temp gauge?  a temp gauge will help with tuning too.

john

Title: whats next after break-in jetting?
Post by: Pumashine on August 13, 2013, 08:29:50 AM

Quote from: hondaman77;8317

wasn't sure if i should make an adjustment/change something then do a plug chop since i know it was setup rich???

Rich won't hurt your cylinder. Running lean will seize the piston. If it is obviously too rich with the plug check then you can go down a jet size on the main. Better safe than sorry. Alot depends on the pipe you are using. I fried my piston with a 175 main jet using a PT race pipe on a OEM ported cylinder.

Title: whats next after break-in jetting?
Post by: GO OVRIT on August 13, 2013, 09:38:40 AM

How does it feel?  Does ot start easy and idle good? Any flat spots or sputtering?   Your plug tells a lot, but the feel and sound is important too.  If you do start changing anything, do one thing at a time.