Kovechkin450
New Member
Hey guys, I need some help! Ill try to keep this as short as possible. I have a 97 GS 717cc single carb. I've had this machine for 5 years now. The compression when I bought it was 120 and 118 psi. The machine was very quick and snappy for the first 2 summers that I had it but it has been steadily declining in it's performance. Last fall it spun a crank bearing so this Spring I rebuilt the entire engine from the bottom up with a new crankshaft. The engine is now bored 2 sizes over to 82.50mm After adhering to a strict break in procedure doing exactly as directed I noticed it still wasnt as peppy as I thought it should be. So i checked the compression, each cylinder is 125, not exactly what i was hoping for out of a new rebuild, however I don't think the compression is the issue since it was faster and had amazing acceleration a couple years ago with only 120 and 118 compression.
It doesn't bog down, and it doesn't seem like it's "slipping" or cavitating. It just doesn't "get up and go" like it used too. I checked the clearance between the impeller and the wear ring with a feeler gauge and it is well within spec. Also the impeller looks good upon visual inspection, ie. no breaks, bends, or otherwise visible damage.
When I'm messing around doing power turns and hammering on the throttle it just doesnt have that crisp snappy response that it should have. It doesn't rev right up really fast, it just gradually increases in rpm's and eventually it will "kick in" and start to accelerate faster. I drove a buddies seadoo this weekend to compare, he has an 800gsx. I know that machine has a quite a bit more power but even still it made mine seem like a childs toy.
I destinctly remember my machine performing much better in the past. So I was just wondering if anyone could suggest something or have an idea of what might need to be addressed.
Also worth noting: the carburator was cleaned last spring and all the fuel lines were replaced with new ones.
Thanks guys, hope someone can shed some light on this situation!
It doesn't bog down, and it doesn't seem like it's "slipping" or cavitating. It just doesn't "get up and go" like it used too. I checked the clearance between the impeller and the wear ring with a feeler gauge and it is well within spec. Also the impeller looks good upon visual inspection, ie. no breaks, bends, or otherwise visible damage.
When I'm messing around doing power turns and hammering on the throttle it just doesnt have that crisp snappy response that it should have. It doesn't rev right up really fast, it just gradually increases in rpm's and eventually it will "kick in" and start to accelerate faster. I drove a buddies seadoo this weekend to compare, he has an 800gsx. I know that machine has a quite a bit more power but even still it made mine seem like a childs toy.
I destinctly remember my machine performing much better in the past. So I was just wondering if anyone could suggest something or have an idea of what might need to be addressed.
Also worth noting: the carburator was cleaned last spring and all the fuel lines were replaced with new ones.
Thanks guys, hope someone can shed some light on this situation!
