It is a stock cylinder head. I found 246cm3 on the bottom of it. What is wrong woth a 295cc? Do I need to run racing fuel? Or will pump gas with Trick be fine?

 

Im a professinal[img]i/expressions/face-icon-small-wink.gif[/img] no, alot of people take a stock jug and put a 295 sleeve it in, then they have to run a cool head with it, so chances are its a 295. Take a compression tester and see how much compression it has. If it has more than 190 you will need race fuel (100-105 octang)

 

OK, thanks I'll do that this week. Since I'm going out this weekend. Now to do a compression test properly it needs to be warmed up first then pull the plug and hook up the tester right? Or can it be done cold? The guy I bought it from ran pump gas with Trick, but he said it was a 330 and Duncan said that would require racing fuel. So I've ran about 3 tanks of racing fuel through it. If the compression is below 190 would it mess anything up to go back to pump gas and Trick? Are there any problems with the 295 that you know of?

 

here is how to check your plug i would not recommend running 1/2 or 3/4 of a mile at full throttle if you are lean (you wont have a chance to check your plug before you motor burns up)

Replace the spark plug with a new one. Ride the bike for five to eight minutes at a moderate pace, vary the rpm and shift up and down the gears. Once the engine is up to operating temperature you can make a jetting pass. Start in second gear and ride at full throttle through fourth gear, fully revving out fourth gear. With the throttle wide open in fourth hold the kill button down, pull in the clutch and stop. This is called a "plug chop"

Read the spark plug. With a pocket flashlight and a magnifying glass look at the porcelain part of the plug only, as you view the plug from the center electrode look down the length of the porcelain to its base at this point there should be a light brown smoke ring. There was not sufficient time to thoroughly color the whole plug, so the nose of the insulator may still be white.

if the smoke ring is dark you are rich if is very light or not there you are lean

 

Duncan recommends race fuel in stock 2 strokes as well. its in there tip section on their site so that doesnt say much.

but if the guy went through the trouble of 295 and a cool head, chances are it is around or above 200psi.

never done a compression test. no help here.

 

do it when its warm then just kick it 4 or 5 times & check it. curious what PSI you have so post it up

 

Can I get a tester at pep boys or kragen? Or do I have to go through a bike shop? I'll try to get a teaster tomorrow, but I wont be able to check it till Tuesday.

 

i got mine at sears

 

Thanks. got one of those in town also.

 

NO post I decided to put as anew topic.