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Forum: 50cc - 124cc

09-24-2022, 10:18 PM

Replies: 2

139QMB 80cc BBK Install Issue

Views: 19,779

Posted By jbmsu

After startup and brief break in, the bike won’t...

After startup and brief break in, the bike won’t start without the AF screw being like 5-6 turns out, runs great until 5-6k rpm and turns hesitates and backfires, bogging down and dying at WOT. It...

Forum: 50cc - 124cc

09-24-2022, 10:15 PM

Replies: 2

139QMB 80cc BBK Install Issue

Views: 19,779

Posted By jbmsu

139QMB 80cc BBK Install Issue

I have a basic scooter rig with a 139QMB 4-Stroke. I rebuilt the engine with new gaskets, CVT clutch & band, variation w/ 6.5g roller weights.

I used the ATMT1-008 Glixal 47mm BBK, and added a...

Showing results 1 to 2 of 2

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