my buddy has a yz 125 and the cylnder has 20 mins on it but it wont hit powerband , but we have it runin rich!

Question

so is that bad i here he shouldnt get on it for 10 hours is that true!!! but sum gears hit power band.... shouldnt it be fine after 1 tank..??

Answer 1

Lean your pilot and main jets now. It is a 2-stroke so you dont need to be all worried about revs once it is broken in a bit. The proper break in is to heat cycle it several times...ride around at varying speeds no more than half throttle until the engine is in its normal temp range..ride it for 6-8 minutes like that then shut it down and let it cool down at least 30 degrees. Repeat this drill 2 more times and on the final 6-8 minute ride crack it open a few times..3/4 to wide open and after that you can beat the snot out of it. Before you do this put a fresh plug in and I would also recommend a synthetic 2-stroke oil for pre-mix as it lubricates better and burns cleaner.

Answer 2

I have bought a couple of late-model 2-strokes and they all had stupidly rich stock jetting. I had to lean-out both the main and the pilot by two sizes. You should not change the jetting by more than one jet size at a time. There could be piston damage if the carb is leaned-out too much.

Answer 3

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Answer 4

To start with the engines a taken up to full revs at the factory before they go into the frame,so don' t worry about it,secondly why are you running it rich?.

Answer 5

The rings and valves aren't seated, the bearings are stiff and the tolerances are too tight for proper oil flow in a brand new engine. There's a reason for breaking an engine in. At least 500 miles till it's right.
If you started redlining it as soon as it was assembled, you've just cut the engine's lifespan by half.

Answer 6

Check the spark plug. After running it so rich, the plug is probably semi-fouled.

Answer 7

You need to re-jet the carburetor. While you're at it get a dictionary.