[98Grizzly600]

Hi i picked this up for cheap. Im needing help. The seller said it needs a new one way bearing but to me it sounds like cam chain slap or valves but im not sure. Its only my 2nd cvt quad my first being a vinson 500 which i never had to touch the cvt but i had to rebuild the top end. Any help would be greatly appreciated. Here is a link of sound it makes. https://youtu.be/tt5NB1_W6CI

 

[dezz]

Timing chains will cause a tick like sound.

Does the engine brake work?

 

[ginochip]

Timing chains will cause a tick like sound.

Does the engine brake work?

i have a 700 and it ticks a bit when warm look at the valves and adj them still ticking cam chain is tight doest was told its normal
your bike soundss like piston slap or bottom end how many k are on the bike was it beat ? ever had oil change ?

 

[98Grizzly600]

I only test drove it from trailer to garage so i didnt get to test engine brake, i didnt want to mess it up more. I started tearing into it and man what a laugh i got. Well i pulled chain tensioner to see if i could feel if it had to much slack and the darn thing fell apart inside motor spring and rod fell down behind flywheel lol. Also i pulled head and saw that whoever rebuilt it either forgot or simply didnt put one wrist pin clip in so it was rubbing cylinder wall. Gouged it pretty good. It has 7,xxx miles. Didnt smoke cranked right up. He convinced me it was cvt main bearing but now i think its time for a rebuild. The oil was pretty bad but not as bad as some ive seen. So i plan on buying new cam chain, new guides, new tensioner. Do you guys think i should bore it or just hone it and put new rings? Do yall think this is my iss causing the noise or should i try to service clutch as well?

 

[dezz]

That's definitely your noise.

That gouge is probably deeper than you can over-bore to fix it. A good used cylinder would be a better option in my opinion. Additionally, Grizzly 600's are very hot runners, and they are worse with over-bores.

 

[KArthur]

When I rebuild my 98, I went with 97mm (+2mm) Wisco Piston and rings. Had a local shop bore it for me. No problems doing that. Here is a link to the thread if you want to read it.

Good luck with it.