Possible bad stator.?

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JZ05220r
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Re: Possible bad stator.?

Post by JZ05220r »

SS109 wrote: 06:35 am Sep 19 2022 Normally I would just swap in a known good ignition coil and test it. That said, aftermarket ones are not expensive at all so totally up to you over OEM.

I would do the leakdown first, then test the ignition and source coils. test both coils cold and then run it until it starts messing up then immediately retest them.
I did the leakdown test and the results were good (i think) so onto the next thing I guess. Thanks
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Re: Possible bad stator.?

Post by JZ05220r »

JZ05220r wrote: 08:13 pm Sep 22 2022 :lol:
Slick_Nick wrote: 09:32 am Sep 22 2022
JZ05220r wrote: 05:36 pm Sep 21 2022

I ordered one last night. I’ll see it goes. I can turn my air screw in all the way and the idle still goes up then eventually back down then up again. I can’t see how an electrical problem could cause that idle issue but I can see how it could cause issues while riding in gear. Leak down test is tomorrow while I wait for the new ignition coil
Well you may have some jetting issues going on as well, but best to just tackle one thing at a time and see what does what.
For the leakdown test I positioned the piston at BDC and pressurized to 6psi. After 6 minutes it had only lost 1 psi. I think that’s an acceptable loss. Going to try swapping the ignition coil first and after I am going to triple check the carb. One thought that came to mind is my current set up. FRP porting, RB head, 35mm carb along with a full fmf system (rev). I had the RB head done before and other engine or carb modification. Could my setup be causing the engine to run rough suddenly while riding? ( maybe overhearing, detonating?) Thanks
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Re: Possible bad stator.?

Post by SS109 »

Your 1 psi loss is acceptable. However, I have heard that the piston should be at TDC but I honestly don't know why on a 2T. It should make no difference. As to your basic setup,there's nothing there that should cause an issue as long as you're running 91+ octane gasoline.
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JZ05220r
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Re: Possible bad stator.?

Post by JZ05220r »

SS109 wrote: 04:08 pm Sep 24 2022 Your 1 psi loss is acceptable. However, I have heard that the piston should be at TDC but I honestly don't know why on a 2T. It should make no difference. As to your basic setup,there's nothing there that should cause an issue as long as you're running 91+ octane gasoline.
Thanks . I’m waiting on an ignition coil. I’ll report back if it works.
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Re: Possible bad stator.?

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SS109 wrote: 04:08 pm Sep 24 2022 Your 1 psi loss is acceptable. However, I have heard that the piston should be at TDC but I honestly don't know why on a 2T. It should make no difference. As to your basic setup,there's nothing there that should cause an issue as long as you're running 91+ octane gasoline.
When inspecting the cylinder through the exhaust port I found these marks. Not sure if that is a sign of something bad.
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Re: Possible bad stator.?

Post by JZ05220r »

D73DE153-6522-4BAD-B238-F6937E5A8DD5.jpeg
D73DE153-6522-4BAD-B238-F6937E5A8DD5.jpeg (2.32 MiB) Viewed 1124 times
JZ05220r wrote: 05:57 pm Sep 24 2022
SS109 wrote: 04:08 pm Sep 24 2022 Your 1 psi loss is acceptable. However, I have heard that the piston should be at TDC but I honestly don't know why on a 2T. It should make no difference. As to your basic setup,there's nothing there that should cause an issue as long as you're running 91+ octane gasoline.
When inspecting the cylinder through the exhaust port I found these vertical marks. Not sure if that is a sign of something bad.
Last edited by JZ05220r on 07:36 pm Sep 24 2022, edited 2 times in total.
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Re: Possible bad stator.?

Post by KDXGarage »

Check out my signature for how to upload pictures.
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Re: Possible bad stator.?

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KDXGarage wrote: 07:31 pm Sep 24 2022 Check out my signature for how to upload pictures.
I figured that out thank you for the help. I just took the bike out for a ride. The idle got higher as it warmed up. The rpms were hanging when I pulled the clutch in. I had to turn the idle down. Once I started to turn it down the idle actually was getting higher until I kept going.
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Re: Possible bad stator.?

Post by KDXGarage »

Did you have it replated?? Are those the scratches you are referring to? (cross hatching)
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Re: Possible bad stator.?

Post by JZ05220r »

KDXGarage wrote: 11:24 pm Sep 24 2022 Did you have it replated?? Are those the scratches you are referring to? (cross hatching)
I was referring to the vertical mark toward the right of the visible plating. Not the crosshatching
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Re: Possible bad stator.?

Post by KDXGarage »

Slight piston smear? Tiny four corner seizure mark?
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Re: Possible bad stator.?

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KDXGarage wrote: 03:40 pm Sep 25 2022 Slight piston smear? Tiny four corner seizure mark?
Those things crossed my mind. I wanted to mention I did another leakdown (6psi lost 1 psi in 8 minutes) and checked the float height again after reading a post of someone mentioning to get the float close to level with the gasket surface. I went in and although my float height was at 17mm I moved it to about 15 mm took it for a ride and the rpms no longer “hung up”. (The manual mentions 17mm +\- 2mm). I roomed if for a woods ride and it ran a lot smoother and faster. I noticed more control in tight woods corners now that the low rpm throttle response was back and the bike seemed much more playful.
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Re: Possible bad stator.?

Post by JZ05220r »

My concerns: As soon as I got to the open field at the end of my ride I banged through the gears a few times and the exhaust note changed (got louder and raspier) and it started to consistently run bad again. I think the problem gets worse the harder I ride because the few times I got on it in the woods it started its raspy tone coming off the pipe. DO I NEED HIGHER OCTANE RACE GAS????? I have never experienced detonation but it’s definitely a metallic as I described raspy note. If it was fully warmed up the idle would drop very low and come back to where I have it set after alittle bit of throttle. The marks in the cylinder! .....Not sure how serious I should take any of these remaining issues but I am an idealist. Should I have the cylinder repaired and start over? I think I’m getting somewhere at least. I know this is so much info, I apologize if the lengthiness is too much. Thanks
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Re: Possible bad stator.?

Post by John_S »

You described the raspy sound coming off of the pipe. If you get it out again try a short burst on the pipe, let off and then as the bike slows down go to mid throttle right away and hold it for a few seconds. The only time my bike has sounded raspy, or tinny coming off the pipe is when I had the needle clip set too lean. Could be the main is lean also though. I don’t remember if you posted jetting or how you got to the jetting you’re running. Did you start rich and work your way down?
One time I started at clip 4 and went all the way to clip 1 with about 5 minutes at each setting. A lean needle sounds like crap (raspy, hollow, tinny) but it’s a good to be able to recognize. If your bike has the right needle in it you should be able to go from stuttering rich, slightly rich, just right, and then lean with the clip settings. The correct clip setting is usually easiest to tell by sound (and feel of course, but mostly sound) once you’ve heard it clearly rich and clearly lean.
Im glad to hear the idle is getting better and interested to find out what finally fixes your bike.
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