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86-89 750/700F/F2 front sprocket


keny

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So I had to change chain &sprockets even old set did not look old as I got my 1986 VFR750F as chain stretched like a rubber band. Was first to just change chain as sprockets looked like new, but decided to change all anyway, always best so. My bike had JT sprockets, new ones was to. Then I noticed the one I did take off was a JTF339, the new one JTF333! A little research tell JT list the 339 for the US 86 750F as 86-87 700 F/F2, while the 333 for the rest of world 86-89 (90-97 to) 750F! The difference between the to front sprockets is a thickness off 2,2 mm at the axle. So chain line difference is about 1 mm. Now the strange thing Honda lists just one front sprocket 23800-ML7-000 for all 86-89 VFR700/750F/F2! 

JTF339.png

9817862.jpg

I just suspect the chain on the set that was on bike when I buoght it was runed becorce of wrong chain line, at least it looks like chain has been running hot

33359172_599304777103556_745195114256243

 

33304798_599304803770220_339249155353555

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the problem with non-OEM front sprockets is noise and vibration.  stock piece has rubber dampers for reducing both.

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  • Member Contributer

Honestly I don't think that less than .010" is going to ruin the chain, as long as it was wasn't the actual thickness of the tooth

portion of the sprocket. I replaced my chain/sprocket and there was easily that much movement in the sprocket on the spline.

As long as the sprocket hasn't worn into the splines, it will kind of self-align and the sprocket will run true.

 

I certainly wouldn't want a lot of movement on the countershaft, but I don't think .010" will really hurt anything.

 

That red just looks like rust. Perhaps the OP was using a solvent to clean his chain at some time and it dissolved the grease

that's supposed to lube the links. Or he used a car wash or pressure washer to clean the bike, both bad ideas BTW. I'd lube

the splines good with anti-seize when I put it back together, metal-to-metal movement is rarely a good thing.

 

FWIW I replaced the OEM countershaft sprocket with an AFAM with no rubber piece and never noticed any

increase in noise or vibration. But that's me.

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  • 2 weeks later...

I have never had a issue whit the noise, but then again never ridden a RC24 whit a OEM front sprocket. And JT now maker a front sprocket whit a damper like the OEM, so might try that one some day, now I already got a "basic" JT front sprocket.

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