dry siesed??

[4cfed]

so redline redneck ( has the kxt250 blaster) bought a stock blaster.. rode it for 20 min and it lost compression

pulled the top end off and it looks as though the rings folded over, but heres the issue

the cylinder walls were DRY!! like dry dry as in brake cleaner and a rag clean NO oil film or anyhting on them, was perfectly dry..


it smoked at start up, and untell it was warmed up, it had klotz snow mobile techniplate in it ( same stuff i always ran in my blaster)

i personnaly filled the oil tank and cleaned the cap orr before adding oil..


only thing i can think of was this was arare case where the injection actually failed since it was running fine for the 2 days before this happend,

what do you guys think?

 

[JonS]

sounds like you have it figured out. probably just failed injection.

 

[4cfed]

sounds like you have it figured out. probably just failed injection.

i dont like to lay blame on something thats been used for ever and a day but thats the only logical reason i can think of, machine wasnt jump no wheelies, it stayed level ground and was smokin just fine for 2 days before hand than this out of no where

 

[sicivicdude]

Pull the injection pump apart and confirm that the injection pump failured.

Then order a block-off kit and pre-mix from now on.

 

[UncagedShadow]

oil injections for the blaster are as notorious for failure as the tors system. For some it might work fine and for others it just quits. I like to be safer than sorry so I blocked mine off as soon as possible.

 

[blasterboy91]

5 years strong on my oil pump...anyways, did you catch it in time without needing to do a full tear down???

 

[sicivicdude]

Some people report running oil injection pumps for many years with no problems and I have never actually SEEN a failed blaster oil injection pump (which is why I'm goading 4cdfed) because most people attribute a failed top end to a failed injector pump without investigating further and tearing the pump apart to find out if the pump actually failed.

 

[4cfed]

Some people report running oil injection pumps for many years with no problems and I have never actually SEEN a failed blaster oil injection pump (which is why I'm goading 4cdfed) because most people attribute a failed top end to a failed injector pump without investigating further and tearing the pump apart to find out if the pump actually failed.

i wasnt laying blame on it, i filled the rezzie up with klots, i cleaned the top of the tank and cap before opening it, to make sure nothing got into the tank,

iv never seen a failed injector ether, seeing my 89 still had the oil injection on it when i got it and i ran 3 tanks more threw it with the injection before i removed it and premixed,

yes it whipped out the top end, ring failure, loooks like a hone may take core of the minimal damage as it died and didnt try to refire it, i pushed the kicker over by hand and said 'its toast'


the rebuild before was done by someone from a local shop, so my buddy may just send the top end off to oconnor and have the hone/bore and porting done so we know its done right

 

[Larry's Shee]

If you can , posts some pics. I'd like to compar to damage from my son's engine stopping. Was jetting for about 20*f and he took it out on lake about 0*f. Don't know if it was too lean, pump quit or oil was to thick.

 

[99LRDblaster]

While I don't have my oil injection unit anymore and it ran fine before, I took it off simply because I didn't want to deal with the maintenance and I wanted to run my own pre mix mixture.

I find it rather hard to believe a PROPERLY set up oil injection unit will fail by it's self. It's possible to get a clot or air run in the oil line, but the oil pump itself is pretty stout outside the plasticky/delrinish plastic clear which some say wears down and fails(I would be surprised). It's usually a line failure or a clot/air bubble in the oil line.

While I doubt it's the case, it's not unheard of for the engine to run some damn hot it straight up burns off the oil in the cylinder from a catastrophic air leak. How did the cylinder look under where the rings touch the cylinder at BDC? Any oil film there?

Shouldn't matter at this point as you are getting the motor worked. I:I

 

[Paulie B]

While I don't have my oil injection unit anymore and it ran fine before, I took it off simply because I didn't want to deal with the maintenance and I wanted to run my own pre mix mixture.

I find it rather hard to believe a PROPERLY set up oil injection unit will fail by it's self. It's possible to get a clot or air run in the oil line, but the oil pump itself is pretty stout outside the plasticky/delrinish plastic clear which some say wears down and fails(I would be surprised). It's usually a line failure or a clot/air bubble in the oil line.

While I doubt it's the case, it's not unheard of for the engine to run some damn hot it straight up burns off the oil in the cylinder from a catastrophic air leak. How did the cylinder look under where the rings touch the cylinder at BDC? Any oil film there?

Shouldn't matter at this point as you are getting the motor worked. I:I

You find it hard to believe a plastic gear can fail after 10-20 years?

 

[4cfed]

the cyl was dry all the way down, and the damage was just about the ports, but off to the sides,

 

[98blaster+4]

when i had just bought my last blaster it had the oil injection hooked up and working. ran it a little while before going too far away form home and all was good, then about 5 miles out the gear sh*t the bed and the oil didnt get into the cylinder at all and it just quit same as you describe. and the plastic gear didnt wear down it split in a few places and shattered . sucked cleaning all that crap out

 

[Paulie B]

That's what they do. Neoprene gets brittle over time and after many heat cycles. Ford used to use Neoprene to make timing gears in alot of cars and trucks in the late 70's-80's.
I've personally replace a shattered neopreme timing gear (with a metal set). It's a PITA
If your not thorough the remnants will clog the oil pump screen and lead to your entire motor failing.

Yamaha's design is good. It's meant to keep kids from seizing up the motor.
It's also an expensive system to replace and Blasters aren't getting any younger.....
We might be jumping the gun here maybe that's not even the problem haha

 

[99LRDblaster]

You find it hard to believe a plastic gear can fail after 10-20 years?

No I said it's pretty stout outside of the plastic or delrin gear. I would still be pretty impressed by the plastic or whatever it is made out of gear shearing down from wear. I had the cover off one time while it was running and it doesn't really spin that fast and it's on there pretty good. Mine wasn't the least bit worn when I took it off.

Speaking of which, did anybody ever make a metal replacement for it? I would think there would be a market for that......something Vito's would sell or something.

 

[darederek]

The previous owner of mine said that the one on this failed cuz the oil got too thick in the cold. Idk wat oil he ran or anything i just know it failed and need a hone and some rings

 

[Larry's Shee]

Metal waterpump gear is a popular mod for the Banshee. Odds are if someone had marketed a gear for Blasters 20+ years ago most would still be using oil injection.

 

[Paulie B]

If someone is dead set on the oil injection just change the gear out every 5 years or so no bigie.
For me I always have mixed gas around so you know which way I'd go...