you can do it yourself. It's pretty easy actually. You're just going to need some kind of angle grinder or dremel tool to cut through the old chain.
The sprockets are both eays to replace. For the front, you'll need to remove the front sprocket cover to get it off (loosening bolts). To replace the rear sprocket, you'll need to take the back tire off.
It may sound difficult, but it's not as hard as it sounds. Although, a local shop could do the whole job for a decent price.
I just replaced it all myself and it only took about an hour and a half. Although, I've already taken off the rear wheel before and replaced my front sprocket, so I knew completely what I was doing. If it's all foreign to you and you don't have a rear stand, I would probably just buy the chain and sprockets and take it to a shop.
You'll need at least a rear stand to do it yourself though. I have an '07 and the 88-07's come equipped with a centerstand that lifts the rear wheel off the ground making the job a lot easier. If you can get a rearstand for pretty cheap, or borrow one from a friend, then attempt to do it youself. See if you can find a step-by-step guide online somewhere. Makes things so much easier.
Before you replace the chain, I would try cleaning it with kerosene, letting that dry, and then giving it a good lube. Do that twice within 1,000 miles and see if it is still stiff. If it is, then you just need a new chain. Proper chain maintenance extends the life of the chain tremendously, just as poor (or lack of) maintenance shorterns the lifespan of the chain considerably.
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