View Full Version : Honda 200s jetting with 10.25:1 piston
PAPA250r
06-23-2013, 05:35 PM
Would like to know if jetting is required with a 10.25:1 piston stock exhaust. It runs great but i am rebuilding the carb and jets are not marked so would need to know what size jets to get i have the stock specks from the manual . Thanks
barnett468
06-23-2013, 06:54 PM
Would like to know if jetting is required with a 10.25:1 piston stock exhaust. It runs great but i am rebuilding the carb and jets are not marked so would need to know what size jets to get i have the stock specks from the manual . Thanks
Hello
Did you bore it out to do this?
If so, how much over stock is it?
Either way I would go up 2 sizes from stock on the main and 1 on the pilot. A few reasons are that a newly bored cylinder runs a little hotter than one that is the same size bore but has been broken in. A cylinder that has been farther than a comparable broken in one will run hotter still. A cylinder that has been freshly bored with a high compression piston will run the hottest. It will run slightly cooler with more fuel.
Listen carefully for a slight "pinging" sound under acceleration. If you hear one you may need to reduce ignition timing by around 4 degrees if possible and/or run race gas. Leaving the ignition timing as is and running race gas to cure detonation will provide the most poser but cost the most.
PAPA250r
06-23-2013, 07:03 PM
I believe it was bored 30 over from the previous engine owner it is well broken in lol been running it a few years but i never had the carb apart until now
I def do not hear any pinging i am familior with the sound its pretty quiet with the stock exhaist
barnett468
06-23-2013, 07:05 PM
Hello
I would also install a new spark plug.
Clean air filter.
Make sure air box lid is on.
Break in properly, don't get too anxious.
Check spark plug color after 1 hour of time on it.
Lite gray = lean
Lite tan = good
Dark tan = slightly rich
Dry black = too rich
Moist after sitting 5 minutes irregardless of color = burning oil
barnett468
06-23-2013, 07:08 PM
Hello
Post correction The word "poser" in post 2 should be "power".
I have no edit button.
barnett468
06-23-2013, 07:12 PM
I believe it was bored 30 over from the previous engine owner it is well broken in lol been running it a few years but i never had the carb apart until now
I def do not hear any pinging i am familior with the sound its pretty quiet with the stock exhaist
Hello
So the 10.25:1 piston has been in there a long time?
You did not just put a 10.25:1 piston in the existing .030 bore?
If this is the case and you hsave been riding it this way for a longt time and it runs fine then why are you now asking about the jetting?
barnett468
06-23-2013, 07:15 PM
Hello
Post correction, "hsave" should be "have" and "longt" should be "long" in the post above.
barnett468
06-23-2013, 07:16 PM
I have no edit button.
PAPA250r
06-23-2013, 07:53 PM
Rebuilding the carb after it started to recently leak and run like crap amd the jets arent marked.
I refuse to put another POS moose rebuild kit in it so i buying OEM parts to rebuild it
Scootertrash
06-23-2013, 09:54 PM
Find your manual here, then download it to your computer. You'll always have one then. ;)
http://www.oscarmayer.net/atc/manuals/
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