Lighter chain and sprockets for 750 SF ?

TeddyG

TeddyG

Hero member
Location
Portland Oregon
My existing chain is @ 3/4” wide and sprockets are @1/4” wide, so I’m assuming it’s 630 (only Regina is stamped on the plates.) So what chain will fit 520 or 530, and what other brands of sprockets will fit?
I can order the chain locally.
Thanks
 
Standard fitment for the 750s are 530. If your counter shaft sprocket has 19 teeth it's a 530.
only the 1200s came fitted with a 630. Not sure if all 1200s used 630 but the TS was.
If you want to go with a 520 you'll need to source sprockets. Not sure who supplies 520 sprockets.
My Motodd runs 520. I use an alloy rear sprocket that I turned down in a lathe and the counter shaft sprocket I ground down using a lathe and angle grinder set up on the tool post. You can anneal the front sprocket, turn it down then re harden it but I prefer grinding them.
 
Rob already asnwered your question ... I'll post anyway - had already typed it out!

Can't tell from your figures what you've got, Ted. I'm assuming you have a 530 (5/8x3/8). I've never seen a 630 on a twin. Even owners of later triples that had 630 chains have dumped them - total overkill in this day and age of high quality lightweight chains.

I'm running a 520 DID VX3 on my twin (which has a whole lot more power and torque than a stock twin). You can buy gearbox sprockets in 520 ready to fit (not sure who the suppliers are). I had a 530 in my parts bin and I sliced a sliver off it to get a 520 width using an angle grinder and cutoff wheel mounted in the cross slide of my lathe. Rear sprockets should also be available in 520. If you couldn't be bothered with sourcing 520, just fit a decent 530. I bought a blank in alu and drilled and machined it to fit my non-std (Triumph Legend 900) hub, but I'm sure you can source 520s and 530s to fit straight onto a stock hub.
 
I also fitted a DID 520 VX3. Good chain. It's done 12 track days, roughly 1600 km flat out and only had to adjust it a couple of times.
If still running a Regina chain more than likely it's original if 15000miles is correct.
What are you measuring Teddy?
Sprocket should be 3/8" and rivet to rivet should be 5/8" for a 530
 
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