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92 xr600r Strange Countershaft

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I'm changing the front sprocket on my bike (see topic) and the countershaft is strange...has half as splines as the new sprocket. Every picture I see online has double the amount as well...not sure why. Anyone have ideas? Did they change countershaft types at some point? Is my engine older than '92?

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Yep. Suck a mile. Bike was sold to me as a '92...I hate getting screwed. Recourse? Probably nothing. Due diligence...must be paid.

Thanks for your help.

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Other than the rear brakes, there isn't much to differentiate a 92 from an 88-90. You have magnesium engine side covers and a rear drum brake I take it? It's a real drag when someone mis-represents an item they're selling like this but it happens frequently with older bikes for some reason . Don't sweat it-- if the bike is in good working order you'll love it just the same. Take it from the proud owner of an '88.

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Thanks, I appreciate the words of encouragement. Interesting...rear disc brakes. Me thinks the engine must have been replaced. It runs good, just miffed on the misrepresentation and the fact that I've ordered a new sprocket chain set from Amazon and the front sprocket doesn't fit. So now I have too spend $18+ for another one.

Is there a reason Honda changed countershafts? Does it provide any advantage?

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If is a 88-90 engine, they have a Nikasil lined cylinder, magnesium side covers (lighter than aluminum and so is the cylinder because it's all aluminum, no cast iron liner) and I think the transmission and small primary gear are lighter because they are drilled whereas the new ones are solid. If it had the 88-90 header, that would be sweet because they were a two piece and stainless steel.

 

It pretty much has to be an 88-90, because 87 and back had dual carbs, unless someone switched the head. I'd love to have a good running 88-90 engine.

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Thanks, I feel better now. Single,XRs Only flat side carb. I think I'll be alright...just need to get that new front sprocket and I should be good to go. Getting the rear shock rebuilt, New rotors and pads, sprockets and chain, foot pegs, mirror for inspections and I'll be ready to roll.

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I think the change in spline count was an attempt to increase the wear surface thus making the splines last longer. Did it work? There are a LOT of newer shafts that shed their splines so I am not convinced. BTW... I have a 1993  XRL engine that has a pre-91 countershaft in it. I am crash testing the notion that the larger splines on the old shafts might just be more durable than the more plentiful, but thiner splines on the new shafts.

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