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Is it smoking blue smoke? When you let off the throttle, decelerate and roll the throttle back on worn rings will give you a puff of blue smoke. Worn valve guides will give you a more constant stream of smoke.
If you need a rebuild just the pistons and rings will cost you $300. 16 valves at $20-25 each, guides $16. Gaskets and you're at $1000 just for parts. Then you've gotta bore the cylinders. Who knows what else is worn out inside. So you gotta get a manual and mike out all the clearances. A rebuild might cost you $2K in parts by the time you are done. If you have a shop do it that's another $2K for labor. Easily more than the bike is worth.
How's the tranny? Better check it too. Trannies have been getting weaker in the quest to keep weight down.
Myself, I've given up on trying to resurrect late model Japanese bikes. Parts prices are insane. Sportbikes are simply throwaway items these days.
Since you already bought it it might be worth it to tear the top end down and check all the clearances. It the cams and valves are still okay and the rod play is still good then it might be worth it to do a bore job, new pistons/rings and just run it 'til it blows up. Then throw it away. Depends on how much you paid for it. Hope it wasn't much.
If you need a rebuild just the pistons and rings will cost you $300. 16 valves at $20-25 each, guides $16. Gaskets and you're at $1000 just for parts. Then you've gotta bore the cylinders. Who knows what else is worn out inside. So you gotta get a manual and mike out all the clearances. A rebuild might cost you $2K in parts by the time you are done. If you have a shop do it that's another $2K for labor. Easily more than the bike is worth.
How's the tranny? Better check it too. Trannies have been getting weaker in the quest to keep weight down.
Myself, I've given up on trying to resurrect late model Japanese bikes. Parts prices are insane. Sportbikes are simply throwaway items these days.
Since you already bought it it might be worth it to tear the top end down and check all the clearances. It the cams and valves are still okay and the rod play is still good then it might be worth it to do a bore job, new pistons/rings and just run it 'til it blows up. Then throw it away. Depends on how much you paid for it. Hope it wasn't much.
