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Thumper · 07-30-2022, 09:46 PM

Sometime in mid-June the lower sprocket cover bolt brought ~3-4mm of threads with it when I removed it to inspect the size/spec of the front sprocket:
https://www.chinariders.net/showpost...32&postcount=3

I finally dug into this. It turns out that the sprocket cover bolts were just too short. Here is the one that brought out the threads with it (lower bolt). I discovered that there was 6-7mm of GOOD threads in the block. A 40mm new 6M bolt fixed it! I mean, it was a relief that I did not have to helicoil or something:

The upper bolt was also undersized. I replaced the original ~25mm bolt with a 30mm bolt. The sprocket cover is reinstalled over a new JTR 270-14T. I also replace the rear sprocket with a 39T sprocket. The bike easily gets past 60mph on the road now.

07-30-2022, 09:46 PM	#446
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,404	stripped threads on sprocket cover fixed Sometime in mid-June the lower sprocket cover bolt brought ~3-4mm of threads with it when I removed it to inspect the size/spec of the front sprocket: https://www.chinariders.net/showpost...32&postcount=3 I finally dug into this. It turns out that the sprocket cover bolts were just too short. Here is the one that brought out the threads with it (lower bolt). I discovered that there was 6-7mm of GOOD threads in the block. A 40mm new 6M bolt fixed it! I mean, it was a relief that I did not have to helicoil or something: The upper bolt was also undersized. I replaced the original ~25mm bolt with a 30mm bolt. The sprocket cover is reinstalled over a new JTR 270-14T. I also replace the rear sprocket with a 39T sprocket. The bike easily gets past 60mph on the road now. Last edited by Thumper; 07-31-2022 at 09:15 AM.
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