Recent content by need2understand

I read somewhere that you should never pull and replace plugs hot. It may cause the plug to seize.

Ok, I got to work. Used lye on the exhaust and for good measure, put a torch to it: it's clear. Took engine apart and cross hatched cylindar, new rings. Getting compression of 135. Bike still runs like crap. Took a look at the spark and when I expected to see a bright blue spark, I saw a...

oh, it took several kicks to get to 120. If we were to base it on just 2 kicks, it'd be much lower.

My book says the bore is 70mm and rings are .2-.5 mm. Guessing wear and that it might have been rebored would make me have to remeasure. If you can provide the contact info where i can get parts, that would be great. I checked for leaks on the carb side by spraying wd40 around the carb when the...

Oh, i tested for vacuum leaks but seems clear.

Seems the compression is low. Not sure how accurate my testing was as i was not able to screw the tester in all the way because of the angle but it was reading at 120 range. Checked with my local shop and was told that it might be hard to find replacement rings for this model. He gave me a...

Awesome advice guys. I bought a compression tester and will be checking vacuum leaks and doing a throrough cleaning of the exhaust. I tried googling exhaust pressure leaks but it's not really clear to me what i'd need to do to check that. Am I looking for holes?

I checked the rings with a feeler guage only. The guy I bought it from said he did a top end rebuild but who knows. It past the thumb check but I guess i'll need to break down and buy a compression tester. I'll need to read up on timing but would a timing issue cause slow power loss over time...

Hi, Been trouble shooting this power loss and learning as I go. It's been fun to learn but i'm getting frustrated and need ideas as to where to go from here. 1979 yamaha dt250. Been losing power most of last season and it's been getting worse as I've been riding. Carb settings don't make...