LT-A50/KFX50 top end replacement difficulty?
#1
LT-A50/KFX50 top end replacement difficulty?
So I picked up a 2006 KFX50, did the typical restrictor removal (exhaust, piggy back, intake, 67.5 main, air box). Still been somewhat difficult to start, and very little bottom end power, still sputters on the top end. But as I started it today, I could see smoke come out of the head gasket, and also some almost foam. I assume my head gasket is toast. I can have the head shaved down .045, I don’t really fear taking the head off, but if I’m going that far, should I go all the way and pull the cylinder off? I’ve got to say, the piston didn’t look the greatest when I had the flashlight in there doing the exhaust.
Is this essentially a beginner job? Do I need to pull the whole engine? I believe I understand the basics, but the last time o touched a piston was small engines class in 98 and I was probably high.
thanks for the advice
Is this essentially a beginner job? Do I need to pull the whole engine? I believe I understand the basics, but the last time o touched a piston was small engines class in 98 and I was probably high.
thanks for the advice
#3
#4
To check if the head is warped, and also flatten it if it isn't too bad, I get an old sheet of glass, rub some coarse grinding pate on it and slide the head about on that. Where the paste is taking metal off, the surface takes on a dull grey/white appearance, if this shows a low spot, continue until it disappears. You will get fed up of doing this before you take too much metal off. You can do the same with the cylinder top surface if you think it is warped. Clean all traces of grinding paste off with solvent before re-assembly. If you do take the cylinder off, I would get it and the rings checked for wear. The rings may have a right way and wrong way up, and there will be a peg in each ring groove that the ring gap has to sit against, as two stroke rings must not move round on the piston.
#5
I can say, it’s incredible that this forum goes back to the years before during and after the LTA50. Lots of information stored in there.
i got the .045 number from those archived posts. I’m under the belief at the moment that the head may have a slight warp. I could see the exhaust when cold, seemed to get better when warm. I’m going to take the head to a very experienced shop. I can probe and see what they think.
www.billbune.com
the goal is to have it back together and relatively functional in 2 weeks for the kids birthday, after that I can go deeper if needed. I have to draw the line somewhere I guess. I want the quad to have enough power to move on a limited throttle, and run good enough for the wife or grandma to start.
i got the .045 number from those archived posts. I’m under the belief at the moment that the head may have a slight warp. I could see the exhaust when cold, seemed to get better when warm. I’m going to take the head to a very experienced shop. I can probe and see what they think.
www.billbune.com
the goal is to have it back together and relatively functional in 2 weeks for the kids birthday, after that I can go deeper if needed. I have to draw the line somewhere I guess. I want the quad to have enough power to move on a limited throttle, and run good enough for the wife or grandma to start.
#6
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#8
I can certainly put a little more effort into checking it. Looking down the pipe when I was checking for that exhaust restrictor looked clear. Exhaust does flow out the muffler, but it certainly could be a little restricted. There was a lot of carbon built up on the combustion chamber.
When I bought the quad and brought it home to go through it good, the spark plug wasn't even tight. just black from soot. cant believe it started and ran.
When I bought the quad and brought it home to go through it good, the spark plug wasn't even tight. just black from soot. cant believe it started and ran.
#10