carb tunning

[FullRace808]

how do u know if ur main and pilot jet are to big or small?

[evilone]

Plug chop, running condition, cylinder head temps.................

[Mystic]

depending on what size your setup is i would start with a good sized pilot and leave the main jet out once you have a good steady idle and throttle response up to 3/4th then put the main jet in. start bigger than you think you need and decrease until you have a good strong steady throttle response from idle to full then do a plug chop as well as constant monitoring of temperatures. if you get sputter in the midrange of hte throttle but a good full then adjust the clip position on hte needle

[Bear45-70]

Plug chop and then read the plug (see Wikispreedia for instructions.

Plug readings;

[FullRace808]

Wat is plug chop?
and I will try to adjust the clip. Kuz I have a little sputter from idle to 3/4.but to full its good

[Mystic]

what size bore, exhaust, and carb are you running? also what size pilot and main are you using now and what oil mixture and air filter? all these things are a factor for jetting

[Bear45-70]

Wat is plug chop?
and I will try to adjust the clip. Kuz I have a little sputter from idle to 3/4.but to full its good

What part of this did you not understand?

Plug chop and then read the plug (see Wikispreedia for instructions).

[FullRace808]

Not to sure wat size.but my bore and crank(50mm fully counter) equals to a 107cc.
1st gen pg long
30 oko(142 main, 58 pilot)

[Bear45-70]

Not to sure wat size.but my bore and crank(50mm fully counter) equals to a 107cc.
1st gen pg long
30 oko(142 main, 58 pilot)

If you do not know what the measurements are how the * do you know what the cc's are?

[FullRace808]

Kuz my frend is the guy who built the motor.and he said its a 107cc

[bakaracer]

depending on what size your setup is i would start with a good sized pilot and leave the main jet out once you have a good steady idle and throttle response up to 3/4th then put the main jet in. start bigger than you think you need and decrease until you have a good strong steady throttle response from idle to full then do a plug chop as well as constant monitoring of temperatures. if you get sputter in the midrange of hte throttle but a good full then adjust the clip position on hte needle

you better go back to reading on how carbs work. there will ALWAYS have a overlap at some point. the main jet starts to over lap before 3/4 throttle.

[Bear45-70]

depending on what size your setup is i would start with a good sized pilot and leave the main jet out once you have a good steady idle and throttle response up to 3/4th then put the main jet in. start bigger than you think you need and decrease until you have a good strong steady throttle response from idle to full then do a plug chop as well as constant monitoring of temperatures. if you get sputter in the midrange of hte throttle but a good full then adjust the clip position on hte needle

you better go back to reading on how carbs work. there will ALWAYS have a overlap at some point. the main jet starts to over lap before 3/4 throttle.

[ottoman]

Plug chop and then read the plug (see Wikispreedia for instructions.

Plug readings;

The above chart is good but not the best way to read plugs.
I was taught how to read plugs by one of the Champion Spark plug tuners. Back in the day the company sent a tuner to all the big races to help teams get the tuning right.
Its really an art and I only know the basics any more but what your really looking for is the soot ring at the base of the porcelain. Looking the the tip of the porcelain can lead you wrong! You should have a plug reader, a magnifying flashlight tool made to look in at the base.
The size of the soot ring will tell you your mixture at WOT... the tip of the porcelain will tell about the heat range too hot/too cold... detonation and other things.

[Bear45-70]

True, but most guys will never disassemble a plug to read the properly or get a real and proper plug reading tool.

http://www.ebay.com/itm/Nitrous-Outlet- ... _504wt_952

Here is a more reasonable one like I used back in the dark ages.

http://compare.ebay.com/like/1406646479 ... si=y&cbt=y

[Mystic]

While I understand that baka, it would take more than a paragraph to fully explain