antonyp

Member
Jun 20, 2002
53
0
Pafos
Just bought a Yamaha YZ125 '00 model and I am sure that the ignition timing is heavily moded by the previous owner. Bike does not perform at all at low RPM and goes like a top at high, meaning that ignition is probably retarted quite a long way! Can anyone explain to me how to make sure I set it back to the factory default setting? Any help or replies would be much appreciated.
 

yz250flash

~SPONSOR~
Aug 8, 2003
150
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If I remember correctly their are two lines that you line up. Remove the cover and their are three phillips screws you loosen to align the marks. I will double check this in my manual for you and post again shortly.
 

yz250flash

~SPONSOR~
Aug 8, 2003
150
0
I reviewed the manual and it states that if the marks are aligned then it should be set correct to the factory specs. Have you removed the left side cover and check to see if the marks are aligned? It should be two lines, I believe one is on the case and the other is on the top portion of the stator (at about the 12 o'clock position).
 

Rich Rohrich

Moderator / BioHazard
LIFETIME SPONSOR
Jul 27, 1999
22,835
16,901
Chicago
Originally posted by antonyp
Just bought a Yamaha YZ125 '00 model and I am sure that the ignition timing is heavily moded by the previous owner. Bike does not perform at all at low RPM and goes like a top at high, meaning that ignition is probably retarted quite a long way!

It sounds more like the powervalve is stuck open.
 

SterlingYZ

Member
Mar 19, 2003
86
0
You know Rich, you MAY have hit it on the head, that's a good one... Unless you know FOR SURE the guy modded the ignition, maybe he didn't, many people look other places for mods first, or he would tell you how he changed things. The powervalve is a very possible cause of this... Let us know what you find.
 

Dino Y

Member
Sep 17, 2003
64
0
I check the power valve and i works just fine i moved the ignition timing but still the bike has a dead low mid power incontrast when it revs up high goes pretty well.
 

antont

Member
Jun 25, 2003
7
0
Having had the 2000 model and then '02 and '03, I remember that the '00 model had a problem with fuel starvation. The float level was very sensitive and the only mod was to add extra breather pipes. Also, check and see if the exhaust port height has been altered. And then, check whether cdi is stock.
Regards
Anton
 

Dino Y

Member
Sep 17, 2003
64
0
I've set the stock settings and the bike gained most of it's power the rest of power loss should be due to the piston, nead a new piston. Thanks guys.
 

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