I have an LT500 some idiot cut the exhaust port to high, is there something i can put in there to lower it. Or should it be welded, or replace the sleeve. thanks

Jay

 

The only way to repair is to resleeve. You can't really weld it, and the only other product that may work is JB weld, but chances are because of the high heat and stress pt on the sleeve, it would crack and ruin even more of your motor.

 

I'd shave the bottom of the cylinder.

 

I also thought of both these ideas, JB i just don't trust it either. But to shave the cylinder was a thought but my piston already comes out of the top of the sleeze .035 now this would make it worse [img]i/expressions/face-icon-small-sad.gif[/img] or am i alrite to go ahead an do that an have someone rec-shape the head for me thanks guys.

Jay

 

JB weld will definitely break and shaving the bottom of the cylinder will lower not only your exhaust port but all the other ports as well. Time for a new jug, Chilli.

 

OK thanks, now if i have my jug resleeved can i fill in the void with JB weld once i set my new ex-port height, that should be ok do u think.

Jay

 

If youd shave the bottom, yes it will effect the transfer height, but that can be easily fixxed.But your only going to shave it,,30-50 thousandths??!! Yes you would probobly need to have the head re-shaped, or not. How much clearence do you have now.How high is the compression now.
As far as I'm concerned, JBweld and cylinder shouldn't be in the same sentence. [img]i/expressions/face-icon-small-smile.gif[/img]
Just how far up is the exhaust port? (degrees from TDC or in thousandths)

 

I measured the compression last nite fresh-top end no hours on it yet, i poured roughly 1/2 oz of oil in the plug hole. kicked it over WOT it reached 165lbs, that in itself sounds kinda high to me, but maybe. i want to set my ex port at 188degree- i would settle for 190 i checked mine i have 191 with no base gasket calculated into the factor an i used a .030 wire which has not been calculated in either i'm guessing here purely i'll have to do the maths, but 195 degrees should be close, my piston's deck height is .038 again with no base gasket figured in. My ex-port to deck height is not quite but really close to 43mm. I ran out of time last nite to check my squish clearance i will do that tonite an post it later on, i just wanna just to be sure but to calculate my compression i would use
pi(D)2xs CV+CCV
---------- =CV then ---------------- = UCCR -is this correct an if i wanted to figure my corrected ratio
4000 CCV would i use my export height instead of the stroke on the
first equation correct or ??? thanks

Jay

 

Ok i have my measurements, my squish is currently at-.045 or 1.147, base gasket is-.015 or .381 my squish seems alittle tight 1.2 would be better but i'm close. I ran the engine twice in sequence to torque my nuts&bults a few times, double checked my compression warm looks like 135psi is the number, that sounds more like to me, my goal here is to get my compression upwards of 160-170psi if i figured correctly i could get close with my ex-port being lowered it currently stands at 42.5mm tall i would like it in the range of 39.5-40.5mm but thats a big drop thanks for the info.

Jay