98 CR80R sprockets

Joined
Mar 23, 2007
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#1
I bought this CR80R a few weeks ago and noticed that the chain was pretty loose but it was still rideable. I went out to some trails this last weekend and on the first day everything went smoothly and I had a lot of fun. On the second day I could tell that the chain was slipping occasionally but I didn't think too much of it because it never fell off and I just wanted to ride. After taking a break I started up the bike but as I was in first gear with the clutch in I could hear/see the chain slip on the sprockets. This continued and I called it a day because my chain adjuster was as far back as possible. There was atleast 4 inches of freeplay with the chain. After further investigation I saw that the roller was really worn along with the sprockets and I'm sure the chain.
So.....I'm planning on ordering a new roller, new sprockets and a chain. For the sprockets right now I'm running a 15/55 ratio. I'm looking at some "Parts Unlimited" sprockets online and because of availability and a desire for more topend I'm looking at going to 14/51, would I notice a dramatic change? There are some big hills around my house that I don't need to fly up but wouldn't want to have the bike not having enough power to make it up these hills without dieing. Also what length of a chain shoudl I go for for a 14/51 ratio?

Also, I'm assuming my clutch is getting bad if the chain was slipping with the clutch in and in first gear, right? Any thoughts on that?
 

Jaybird

Apprentice Goon
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Mar 16, 2001
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#2
You won't notice any change in the gearing, as it is the same ratio with both choices.

Make a decision...more top end, or more torque on the hill. You simply don't get both.
You want more top end, change the rear to a lesser number teeth.
If you want more power for the hill, change the front to a 14 and the rear to more than a 51.

My assumption is that this bike has been run hard and put up wet.
 
Joined
Mar 23, 2007
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#4
well there is far from a ton of torque with my bike but it is fun

the 55 tooth was nice for getting up hills as I didn't need to rev the bike up as much and the bike was definently fast enough for my trailriding anyway

but now I've had a hard time trying to find another 55 tooth sprocket besides through my Honda dealership and they want $120!!!! that's a ton of cash for my 98 CR80 so it looks like instead of goign 15/55 I bought a 14/51 ratio online and we'll see how that goes