1999 blaster!!!

[Triplecrown421]

1999 blaster!!! Offset sleeve!!

just picked this up the other day, not a bad deal but had to drive almost 5 hours lol oh well.....

as you can see i got a nice fmf pipe ( covered in dirt) and a rigged DG muffler on it. i like the alloy blue shifter (thats going on the 88), the blue bars with mint fly nerf, almost new front tires and the billet oil block off!!!!

The arm is welded which sucks but i will probobly leave because its not hurtin anything. the axle is missing a nut and guy said it was striped, but i gotta axle sittin around after swappin a banshee one in my 88.

The motor was said to need rings and that it just got sleeved with a forged wisceo piston. now before i get into this ill let yea know i failed, i didnt get any pics ATM of the motor. iknow iknow i f@cked up.
BUT taking off the cylinder we did notice the cylinder had been sleeved, There was also a mint looking forged piston with no rings on it (they had been removed).

There was a good and bad with this topend that i dono where we stand on them. the good was the cylinder head was RECHAMBEREDDDDDD!!!!!!!!!!!! kinda sapprised me when i seen it, not a great looking design but the squish and chamber were adj.
The Bad There was a 66mm piston and sleeve which is great first bore BUT the damn cylinder sleeve is Not straight in the cylinder. The sleeve is turned ferther to one side, hanging over on ever port in the cylinder. This thing musta worked like sh*t.

i will be getting more pictures of the loot

 

[Mac_49]

Since you're already unassembled.....might as well just stick a 250 in the frame!!!

 

[007blaster]

How much did you snag that for? Whats your plans for rear brakes?

 

[Triplecrown421]

Since you're already unassembled.....might as well just stick a 250 in the frame!!!

magin not!!

How much did you snag that for? Whats your plans for rear brakes?

bout 6 times as much fuel i spent

 

[best]

I got some pictures of the head and cylinder.
This is kind of interesting. Note the exhaust traces at the top on the painted surface.
Also note the chamber shape and offset burn pattern.
Exhaust (front) is up.

Obviously rechambered, interesting in that the squish is concave to closely match the piston.
The chamber is a larger version of the stock chamber and very nice machine work, looks like CNC stuff.
Anyone recognize this as an aftermarket head or someone's handiwork?

The exhaust burns on the painted surface are from the head missing a nut and it leaking.

The offset burn pattern had me puzzled. What would do that?
It didn't take too long to find out. You will see in the pictures below.
The offset burn would be from badly unbalanced transfer port flow. Really disrupt cylinder clearing.
This would have a bad effect on power production.

So, cylinder pictures below:

Sorry, kind of out of focus, but look at the cylinder skirts, upper left and lower right.
See the offset lip, and none on the other side. Sleeve pressed in twisted to one side.
Better picts:

Wow! Badly offset. Besides the skirt, look at the intake port.
Here it is looking up from the bottom:

Sharp port edges, not deburred. Luckily it didn't mangle the piston too bad.
Looking down from the top of the cylinder:

And a final look into the exhaust port:

Wow! Not only offset to the side, but also badly overhanging top and bottom.
Besides poor flow, this would effect port timing. My guess this cylinder worked terrible. Much less power than stock.
Too bad, considering how much someone paid to get this work done.

I did a few sleeves when I worked as a machinist, but only ever 4 strokes.
I have seen this sort of mess before (even on factory cylinders) but this one is truly the worst I have ever seen.
I know that cleaning up smaller misalignments usually results in big power improvements, so this misalignment must be a killer.

Somewhere along the line we will try running this as is and then clean it up to see the gain.

 

[sporty982000]

Thanks 4 sharing, whats worse, is who ever did it, as not honorable enough to tell the person who owned it. let alone fix it.

Even worse, they tried to run it, like that.

Dont know the kind of deal you got, you were not specific on it, just that it was a 5 hour drive there to get it.

Sporty

 

[Triplecrown421]

thanks for getting those pictures my main focus was on the offset cylinder, wow its bad.... It would take alot of cutting to true that up. Is there a way this could be straightend??

 

[dksix]

Would the burn pattern be because the sleeve was twisted? Maybe that would cause a side turbulence on the fresh charge going into the chamber.

 

[dksix]

thanks for getting those pictures my main focus was on the offset cylinder, wow its bad.... It would take alot of cutting to true that up. Is there a way this could be straightend??

Aluminum expands more than steel, heating the whole cylinder might give you enough room to twist it. I would figure out a way to do the twisting before I did the heating. If possible, heat it in an oven so that everything gets to temperature together.

 

[Triplecrown421]

Aluminum expands more than steel, heating the whole cylinder might give you enough room to twist it. I would figure out a way to do the twisting before I did the heating. If possible, heat it in an oven so that everything gets to temperature together.

best did mention this when we were looking at it. where would be a good spot to give the sleeve a smack?

 

[dksix]

I don't know about smacking it. Honestly, I wouldn't be surprised if it didn't loosen up enough to just turn it. A friend of mine had a cylinder sleeved earlier this year and it twisted while running, due to the machine shop over boring. I'm not sure how hot a Blaster cylinder would get on the inside but I'd suggest heating it to say 200 degrees and checking to see of it loosens up, if not step it up 50 degree's and try again. If it doesn't turn easily before 400 degree's I'd tap where I could and see if it moves. If it's still tight at 400 degree's I'd say it will be ok to run. If it twist under 300 degree's I'd say it's not going to be usable.

 

[best]

Would the burn pattern be because the sleeve was twisted? Maybe that would cause a side turbulence on the fresh charge going into the chamber.

It is exactly because the sleeve is twisted. It would totally mess up the scavenging.
Probably made less hp than stock, no matter what mods.

Steve