Ol Sled Knocked in the Head

UpstateDoubleD

UpstateDoubleD

New member
Joined
Sep 24, 2013
Messages
21
Age
60
Location
Upstate NY
Hello TY,Newbie here,,, awesome site...
Picked up 3 used V-Max sleds a few weeks back.
A pair of 1996 V-Max 600, One runs great other parts sled (owner crashed it).

Seller resurrected a 1994 V-Max 600, sold it for $200 more if I get all three sleds on the same deal.... Hell yea,,, 3 sleds for $1K... I'll take 'em....

1994 V-Max was real noisy on the top end running in the garage.
I pulled off the Y pipe and found a little scaring on one of the pistons.
So I torn the top end down and here is what I found....

pistons.jpg



A Small scratch in the cylinder, below the exhaust port, just nuff to catch a finger nail,, not too deep.
cylinder.jpg
[/IMG]

My ? is what are the specs for the cylinder and pistons? I have searched here 1st but not much luck on the 600. Gonna take the cylinders down to the local NAPA as I heard he can guage the bore and see where we are.

I'm hoping I can scotch bright the cylinder and maybe new pistons/rings? Sled will be wife's sled, no need for super powers but reliable...

What is the wear spec for the 600 anyone ?

Thanks !

Double D
 

wear limit for cylinder :74.9mm
taper: +/- .05mm
out of round:+/-.01mm
piston standard size: 74.702-74.721
*be sure to measure 15 mm up from bottom of piston skirt
 
roudyroy1 said:
wear limit for cylinder :74.9mm
taper: +/- .05mm
out of round:+/-.01mm
piston standard size: 74.702-74.721
*be sure to measure 15 mm up from bottom of piston skirt
Click to expand...

Thanks for the info RR1 !
An Dang it I knew it would be a quest, I like T Molly ....


http://www.ebay.com/itm/290928796863?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

t-moly.jpg


But the description is;
T-Moly Series Piston Kit - Standard Bore 74.80mm

Details:

BRAND: Sports Parts
Manufacturer's Part Number (MPN): 09-826

Found at ;
http://www.ebay.com/itm/290928796863?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

Or the
2 SPI Piston Kits Yamaha V-Max 600 Standard Bore 74.8mm

http://www.ebay.com/itm/380597163418?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

I never made it to NAPA for measurements...
We have got to start there,, got a dirt bike buddy at work that can hook me up with some dimentions
 
what did you end up doing for the scratch in the bore below the exhaust port? were these jugs nikasil/chrome plated or just cross hatch on steel?
 
Make sure the oil pump is functioning, common problem on these twins. The small "flat head" looking tab on the end of the pump rounds off and you will never know its not turning, until you seize the motor that it.
 
biglsells said:
Make sure the oil pump is functioning, common problem on these twins. The small "flat head" looking tab on the end of the pump rounds off and you will never know its not turning, until you seize the motor that it.
Click to expand...

Thanks biglsells !
& Haa crap I got to check that ! :eek:
You must be talking about the 'Regulator' part the cable goes to?

Oil Pump PDF

I took a tip from you guys and I'm running Pre-Mix in it now.. :sled1:
When cleaning the carbs there was like no way any oil would mix in there for 5 min or so.
Bonus was, I think I smoked ever single bug out of the garage !

Lookin' Pretty good, Got some detailing done tonight, will upload pics soon....
 
Backwoods M Max said:
what did you end up doing for the scratch in the bore below the exhaust port? were these jugs nikasil/chrome plated or just cross hatch on steel?
Click to expand...

Hey thanks Backwoods for sticking with me on this long thread !

Answer : Honed the Pi$$ out of them both.
Answer 2: Gonna have to go with Nagasaki Chrome on this one, super hard with a shiny, (light) spiderweb of cross hatching.


Went with the SPC Pistons kit,the stockers were killed..
http://www.ebay.com/itm/380597163418?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

The scratch never really went away but faded and was smooth again.
No catch 'ems around the port....New pistons fix sooo much better....

The thing I keep reminding my self is...
Put it back together, break it in and RUN IT !
It's a used 2 Stroke and I'm gonna be running the CRAP out of this thing...


:sled2:
 
biglsells said:
It's hard to tell from that pdf schematic but looks like a very similar pump. See my thread here where I posted pics of what the bad pump tab looks like vs a good pump tab. If yours is bad and you stop running that pre mix, it will go boom again ;)

http://www.totallyamaha.net/forums/showthread.php?t=84887&page=4&pp=10
Click to expand...


Hole Lee crap, thanks biglsells !
I will pull that bugger out ASAP and check it.
I could be just like this unlucky guy that cooked the same motor several times.....Ohh wait that was YOU biglsells!




biglsells 1st then mine...PTO side gettin' a bit toasty...

That might have actually been the start of this whole tread with the oil pump not running (very well at least) started to fry the pistons.

What a bummer to get the wife on her new (to her) sled and hear that "Do you smell something hot? It's not running very good and just died"
#$%&* (That's when you try not to swear too much 'round the kids.)#$%&*
"I just rebuilt this thing now what,,, ohh no,, won't turn over :whine: Ugggg"

It really is so great having friends in the know. TY forums are awesome !
 
You can see the oil pump right there on the left.....
At least I think that is it,,, is where the cable goes to from the throttle ?
 
UpstateDoubleD said:
You can see the oil pump right there on the left.....
At least I think that is it,,, is where the cable goes to from the throttle ?
Click to expand...
Yup that's it and boy the oil level didn't seem to go down much..ummmmm
I bet I should replace that crusty A.. filter while I'm in there...
'Nother part number search....... ;):D
 
F.Y.I

-T.S.S. Maintenance
On most every used T.S.S. sled I've bought the Knuckles and steel bushing are frozen and completely locked up and pivoting on the bolts ! I've bought sleds that the locked up joints won't even allow the springs to return let, alone the struts to work when hitting a bump. The T.S.S sleds have always gotten a bad rap for slop developing when the ungreased steel bushing's freeze up they grind away on the nylon washers ! I have sleds that are 15+ years old that have never had a bushing kit and are almost as tight as new. Just take the knuckles and the ski mounts apart every other year and grease !
http://www.ebay.com/itm/Suspension-Shim ... f3&vxp=mtr
http://www.ebay.com/itm/Yamaha-TSS-Fron ... 84&vxp=mtr
Shim Kits http://s15106.50belowcommerce.com/produ ... oducts=tss
http://www.mfgsupply.com/m/c/100-650.html
 
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