Topic: Will a JTF338 16t front sprocket work on K7 750

[seanbarney41]

the reason you need a sprocket with one flat and one shouldered side is not for chain alignment...it is because a sprocket with both sides shouldered is overall too thick for the retaining bolt to tighten up on the shaft correctly.

[madmtnmotors]

the reason you need a sprocket with one flat and one shouldered side is not for chain alignment...it is because a sprocket with both sides shouldered is overall too thick for the retaining bolt to tighten up on the shaft correctly.

This is also true. I have used an early 530 sprocket with the double shoulder and had issues with the retaining bolt coming loose. The washers under the head nuts are 2mm thick and I was able to use one of them behind the retaining bolt to fill the 2mm void to mitigate that problem, but the single shoulder 650 sprocket is a better solution IMHO. 

Wilbur, you are correct: the flat side faces out. I checked my original K7 sprocket and it's also stamped on the flat side. I measured both ways and compared to my K1 to verify. Perhaps the shoulder side faces out when installed on a 650?

That's part what makes this forum such a valuable resource. Many of us have experienced one or more of the issues presented and hopefully as a collective can sort things out, even if it takes a couple of tries!