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Old 04-01-2018, 09:52 AM   #21
FoxRider
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Tire out of true? Did the bead seat correctly all the way around?

I didn't hear any backfiring but maybe a crackle or two. Did you check the valves, spark plug, and carb before-hand? Sometimes the wrong exhaust can cause odd running issues, too. Compare the mufflers inner diameter to other 125s to be sure you're close enough. A muffler too big will remove necessary backpressure. The quick fix is a db restricter/ silencer/ spark arrestor. The header looks fine.
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Old 04-01-2018, 11:31 AM   #22
Chris_5.0
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It had some crazy backfire.
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Old 04-02-2018, 11:08 PM   #23
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I've had off throttle back fire from a plugged pilot jet. Also the hesitation in throttle response could be another sign of plugged pilot / initial lean condition in first part of throttle range. Having improvement from moving up the needle suggests was lean condition even after initial pilot circuit part of throttle. You may want to check for air leak (air sneaking in without being accompanied by fuel), orings gaskets between carb and cylinder mounting could be areas to check. I notice you said carbs been cleaned in the build portion of this thread. Were you able to verify the pilot circuit by spraying through the little hole up into carb body abive the pilot jet. Not really knowing the history of all the parts that went into what you have you may want to pick up a carb kit that way you can start with fresh jets, new orings, and a fresh needle (somtimes they can wear from rattling around) and then go from there.
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Old 04-14-2018, 07:28 PM   #24
BuckNut
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Well, the old fat man got licensed today and “tried” riding the XR-125.

Morning conditions included thunder, lightening and hail. With a damp track and avoiding puddles the practice pace was very moderate. This was the first time riding the bike and as I slowly gained pace the chain broke.

Well my crewchief (nephew) failed to install the new chain I’d purchased earlier so he got assigned the task. I jumped on my sons bike (Parker) and enjoyed playing with the high HP bikes on a wet track. I must say his little bike is set up well and rails very predictably through the corners.

Once the XR-125 got sorted (thanks Everett for the fine tech inspection and help) I was less than impressed with the bikes cornering performance. Corner after corner the bike tried to throw itself down. Exiting from the apex under moderate power was an absolute disaster. The front kept sliding with moderate throttle. Added frustration was a odd sensation going down the front stretch in full throttle.

I’m thinking to myself, no way can I let my nephew ride this bike tomorrow much less myself entering in the dinosaur race. After counsuting with Everett and a few others in the pits we notice the rear shock was really soft. Then wear marks of the tire hitting the front swing arm was noticed.



My nephew suggested that we go back to the stock swing arm to remedy the tire rubbing.



Well, we ended up taking a few links out of the chain (bike got shorter) and the shock suddenly became stiffer. distance increased between tire and swing arm.





We also notice the rear height seemed to of increased making the bike look more balanced.



Well, the new bike setting were not tested because of the endurance race. That means we will have to evaluate in the morning.

Stay tuned...
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Old 04-15-2018, 01:15 PM   #25
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looks better with the stock swing arm.
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Old 04-15-2018, 09:04 PM   #26
BuckNut
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The good:

1. Successfully completed a couple races.
2. Bike no longer trying to throw itself down on corner exits.
3. Got to race against my kids.

The bad:

1. Hard as trying to start a corner.

2. Won’t hold a tight line. (Found myself dive bombing from the outside into the apex in order to get any type of corner speed.)

3. My kids are faster than I at the moment.

4. Developed some type of oil leak. This was found on the last corner of the track. The rear end started comming around on me, and before I thought to myself that this bike couldn’t possibly make enough power to highside much less spin the rear—— I’m sliding on my back with the bike stopping in the middle of the track. Apparently oil on the rear tire is not good for corner exits.

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Old 04-15-2018, 11:14 PM   #27
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Nice upgraded parts. I knew there was a good reason to turn Everett down on the china bike...it had a better life planned!

Popping on decel is leanness...more likely a bad carb boot, o-ring leak, or if it won't idle a clogged idle jet. I'd start at the cylinder and work backwards.
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