Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/14/2018 8:33 AM

The stator is From Ricky Stator and is new. The two CDI units I have are the original one from the YZ and a used one from a running bike, same as mine. Both the CDI’s have been used and they make no difference.

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/13/2018 4:49 PM

I’ll check. Here’s the thing. My son and I did a partial restoration on it. It was running fine before the stator meltdown. So, I’ve made no changes to the carb settings since then. I would think it would run the same now that it has a new stator. Thanks ... more »

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/13/2018 2:31 PM

Correct me if I’m wrong, but when you roll on the throttle from an idle, the pilot jet kicks in, right? I thought it might be clogged, but it’s not. One of you suggested the new stator might be bad, but all it does is generate voltage and send a signal ... more »

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/13/2018 1:43 PM

I pulled the carb and checked the float level. It checks out. Also cleaned some crud from the carb and blew all the jets and passages with compressed air. I reset the timing and it’s still doing the same thing. Also pulled the reed block and the fiber ... more »

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/13/2018 11:21 AM

The ohm readings look good on it. Plus it starts and idles fine. Just when I crack the throttle open, it huffs and dies. I’m going to recheck the timing and check the pilot jet on it.

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/12/2018 5:37 PM

Oh, and the timing should be fine, as I set it to the factory specs with a dial gauge.

Added reply in a thread 1981 YZ125H backfires and dies right off of idle. 10/12/2018 5:31 PM

I just restored the bike. New top end, fiber reeds, etc. The first time out, the stator melted down. A dumb assembly issue, so I put in a brand new stator. All was good, before the stator meltdown. Not sure what the issue could be. I guess the fiber ... more »

Started new thread 1981 YZ125H backfires and dies right off of idle. 10/12/2018 5:05 PM

Just put a new stator on my 1981 YZ125H and it starts and idles fine, but when I begin to open the throttle it backfires and dies. It was running fine a month ago, before the stator meltdown episode. Iv’e tried two different CDI units on it with the ... more »

This forum thread has 17 replies

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/11/2018 5:55 PM

Got it running again!!!

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/11/2018 10:12 AM

Talked to the Ricky Stator people. Turns out I have the stator coils in upside down. That is why it’s 4 stroking.

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/11/2018 6:36 AM

Yeah, this is a motion pro gauge, but I’ll bet it was made in China.

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/11/2018 6:32 AM

I own a dial indicator for setting timing. I am going to check it and make sure it’s correct. If it is, I’m going to try retarding it a bit more and see if that helps.

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/10/2018 8:00 PM

Yes, stock jets. It was running fine before, but I replaced the stator and flywheel, so I’m beginning to think I need to retard the timing a bit.

Added reply in a thread 1981 YZ125 4 Stroking at Idle 10/10/2018 6:09 PM

Started new thread 1981 YZ125 4 Stroking at Idle 10/10/2018 6:08 PM

Ok, so I recently replaced my stator with a new one from Ricky Stator, following a complete stator melt down. When I start my YZ it is firing on every other stroke, at idle. I’ve read that they call this 4 stroking. Anyway, I replaced the CDI with another ... more »

This forum thread has 11 replies

Added reply in a thread 1981 YZ125H Electrical Question 9/14/2018 7:46 PM

Here’s

the flywheel pic.
Added reply in a thread 1981 YZ125H Electrical Question 9/14/2018 7:44 PM

OK, did some thinking and reconstructing of events and have pretty much figured out why this happened. When My son and I installed the flywheel, then went to set the timing, we had to rotate the stator plate all the way, full lock, to the right to get ... more »

Added reply in a thread Spark Arrestors and YZ125 9/13/2018 6:20 AM

Thanks! That’s good input.

Started new thread Spark Arrestors and YZ125 9/12/2018 5:03 PM

A local state park requires spark arrestors on any motorized vehicle and I was wondering how much of a performance loss are we talking about if I install an FMF spark arrestor. I have a restored 1981 YZ125H.

This forum thread has 3 replies

Added bike check 1981 YZ125H 9/10/2018 10:12 PM
1981 YZ125H