600 triple engine what mileage to open top end

helix

helix

Member
Joined
Nov 24, 2006
Messages
106
Location
QC, Canada
Hi,I have 5500 miles on the Venom engine. Should the top end be looked at now or is it safe to go a couple thousand more?
 
I would not touch it yet. I got 6000 miles on my 600 and 700. they both run better every year.... :2strokes:

Just make sure to do your regular maintenance... :rulez:

Nick
 
Awesome

Thanks for the input fellas, great news as I just spent a pile of time and $$ on a new track & studs,every bearing in the machine,wheels,slides,brake pads,welded both running board heat exchangers(leaking under rear mount)ETC.
 
Just to be a devil's advocate here... but some say to do the rings around 3,000 miles. I just did my rings at 5,000. I had to take the bottom end apart to replace the PTO side bearing and replace the seals. Since it was all apart anyway, I figured I might as well do the rings. Remember if the rings get too worn they can lead to broken piston skirts. And that can get expensive when you have some of the junk get into a crank bearing and reek havok.

All that being said, I probably wouldn't done the rings yet, but since I was in there... I'm just saying... peace of mind is a good thing when it's -10 outside and you're 10 or more miles from the nearest shelter.
 
I think the crank seal was starting go bad on that side... I was waterskipping and sank it... I didn't get all the water out before it sat for the summer and the next season. Middle of January, I heard strange ringing sound from the PTO side, I thought it was ice in the primary or something because it went away after it warmed up. I thought nothing of it again until a month later I was having Clutch issues and pulled the primary and to my surprise there were only 3 balls left in the outside bearing!! It was the second season I owned the sled so I don't know for sure what kind of maintenance was done to it before I owned it.

Anyway, the reason I think the crank seal was starting to go is that I kept having trouble with plugs on the PTO cyl. They fouled alot. But since rebuilding it, I haven't fouled a plug yet, even when I had my jets pig rich, because I was tuning my pipes new to me triple pipes.
 
If you went by the 3k rule I would have had to do mine part way through the first winter and part way through the second winter and then 3 more times after that.Over 15k on it now,so if I was going to do it I'd have to do the pistons and crank anyway.So what would I have saved/prevented by tearing it apart every 3k.My compression(when I quit riding this year) was 115 pto 123 center 123 mag with no visible marks on the piston skirts or blowby below rings(on the exh side anyways)and still gets to 100 mph pretty quick.These aren't Suzuki motors were talking about they're Yamaha and I think that they're a lot better built then some give them credit for.I've said it before and I'll stand by it.............I think people tear into to these motors way too premarturely.Just look after them in the spring and fall and then ride the crap out of them(I doubt there are many out there that have been ridden harder than mine except for the mountain guys).JMHO.
 
Go by leakdown test readings. Take them at the end of every year
and write them down. Once your motor reads over 10% I would
start looking at a rebuild. The rings are what you are checking and
while your in there check everything else. Compression test is not an
accurate reading of your rings sealing ability.
 
I say dont bother until you are having issues. even dynotech did a dyno test of a 600 doo witht he flaking rings. had LOTS of leakdown (something like 50-70% or something) and after the new rings and pistons were installed it only gained minimal power. I thought it was something like 1.5 hp after the rebuild. I know everybody has what works for them, and this is what has worked for me. hell, my crank went bad before my rings. all original with 9k miles. only died because of rust on the crank
 
thats the best part about the yamaha triple, you wont find a more dependable machine. Mine has never been touched. My buddies has 16,000kms on it and he has never even cleaned the carbs (untel I did it for him this year) and has never blown a single belt, I blelieve he is one his second belt and thats just maintaince.
 
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