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There is another problem you could have that you need to check if your tear the engine down and that is the valves themselves to insure they are not sticking and slide freely. To do this you need to remove the valve springs. the valves should not have to be pushed in and out they should fall...

I service a lot of mowers and have had to replace several cams. If it had no valve gap meaning the valves were being held open, it should have turned over easy. The less gap you have the easier it should turn over. That being said which from your description it sounds like at some point someone...

I have seen one that smoked on start up after setting a while. It turned out to be fuel smoke because it was carb leaking slowly into the intake. It was a light blueish smoke.

Easy way to check to see if it is a fueling problem or ignition problem is to take some starting fluid and when mower quits on you spray some into the carb if it fires off for a few seconds then quits it is a fuel problem if it doesn't start for a few seconds then you have an ignition problem...

There is another possibility. A sticky valve, it may be opening and closing but may be slightly sticky and not closing fast enough. I had this on a Vtwin and it would backfire at certain RPMs especially lower RPMs or when decreasing PRM. Had to remove the head to clean valve stims (build up of...

I have done this several times and it is not very hard. First off There is two ways I have done this. I remove the pin from the piston and only one ring from the pin. I put the piston back in using a ring compressor then push it to the bottom of the cyinder just enough for the pin to go back in...

Placing an rpm guage will allow you to run the engine at max rpm (this has to checked using a mechanical rpm gauge to insure the new guage is set and reading correctly) . This will give you more power and if it starts to bog down you can increase throttle for short period. This means it will be...

I live in Mississippi. I think there is more to this than just ethanol causing the problems. I work on small engines all the time. I have customers that use only nonethanol fuel and if the engine sets up for say 4 or 5 months they have problems with the carburetors so not so sure the problem is...

Did you use a ring grove cleaning tool to clean the ring groves before installing the rings? If you did not it may be the rings to tight after sitting overnight. Carbon build up in the groove will cause the ring not to compress all the way. The cylinder is not perfect, it will have areas the...

I purchased most of the bearings I replace from a Bearing supply store that is near me. They are a little higher quality and a little more exspensive and I have not had any issues(industrial bearings). They are mostly Timken bearings. Beware of bearings made in China and though Japan has gotten...

MS fuel also sucks.

Everytime I have seen a needle/seat problem has been that either it flooded the engine causing it to smoke white exuast or go into the oil and not run smooth or you get no fuel. I have found most of the time the needle/seat will not cut off the fuel flow if the needle/seat is bad and there by...

Tom I work on a lot of mowers during the summer. I have not had an instance of the needle and seat causing this but I have had a float that caused the carb to be overfilled by being set to high. This caused a higher fuel consumption.On this occasion no one had been in the carb so all I can...

I have found that in most cases of the needle and seat gone bad or sticking that it is either not going to get fuel or it is going to flood out. The way he stated his problem is not indictive of a needle seat problem because if it is even slightly seating open it will cause flooding that will...

Troubleshooting To troubleshoot you need to have a procedure. This procedure is setup so you can use all the information to determine what the actual problem is. Below is my trouble shooting procedure. I use this on any device I work on. I repair electronics, electrical, industrial machinery...

From your statement. You said exaust smells rich. That indicates to rich of a air/fuel mixture caused by carburetor misadjusted or need cleaning.The carburetor could just need a good cleaning, if the air ports that control the air fuel mixture is clogged they will cause it to run rich because it...