Dolmar ps510 Problems

First off hello to everyone, this being my first post. I have been working on a dolmar ps510 for a buddy of mine, i put a carburetor rebuild kit in it and the saw still will not run dont even hit. It has good spark the saw is not very old and hasnt been used much its set more than used. But after a few pulls it smells like its flooded. Does anyone have any suggestions as to whats going on with this thing. Thanks

 

Welcome, stinson. I'd pour a tsp of fuel mix in carb throat and see if it will run for a few seconds. Or if it's already flooded, pull fuel supply line off carb and pull until it clears and look for burp. (May take a dozen pulls to get fuel mix proper). If you can't get any burp, need to check compression. A good gauge is best but holding saw by pull handle and dropping is a ball park check. You want Lug........Lug........Lug. Not Lug.Lug.Lug. And you're sure you have good spark? Pull muffler and look at piston, ring and intake cyl wall.

 

I took the plug out and touched it to the top of the motor while pulling and seen a good spark. What gets me about the saw is it was given to my buddy awhile back brand new in the box, and he only used it twice and then it set for about a year without use so he brought it to me because when he got it out awhile back he couldn't get it started, so i pulled the carb apart and cleaned everything good and when i put it back together it purred like a kitten fired right up. So i took it back to him and it set for two days and he couldn't get it to start and i had no luck with it either, so i went ahead and put a rebuild kit in the carburetor and it will not run at all.

 

1 ) the good spark must be inside the cylinder not outside outside need 800volt for spark but the saw need about 8000 volt
2) if the saw smell like flooding the needle in the carburator stuck this flood the saw no mater how good are you clean the carb check the needle holder and all this system
3) have you check the saw for leaks ?? for example impulse line fuel line e.t.c if no check them
4) low compression and the saw can not start must from 120 and over
5) check for the flywheel key if is ok or if is damaged

good luck

 

Maybe it's flooding but I'd still check compression next. On the carb - maybe needle lever height is too high. Or check valve is damaged. When I've tried 2x with a carb, I give up and get a new carb. But those carbs cost big bucks. You can look your carb over and see if a substitute will work - referring to impluse hole, throttle and choke links. Eg. I've adapted the MS250 carb to work on other saws. It costs $10.

 

Is the plug wet when you remove it after pulling the starter a few times? Try a new plug and pull it over with no choke and throttle wide open. The plug will tell you if it is too much gas or maybe not enough.

I think it might be severely flooded.

 

Ok guys i tried working on the saw again this evening, i put a new spark plug in it and still no start. So i tried pouring a tablespoon of mix gas directly in the carb throat and still no fire, pulled the carb back apart and everything appeared fine. This thing has me stumped ,also i seen no leaks anywhere. Ive tried with choke and without choke with throttle wide open and still nothing not even a burp. Does anyone have any other suggestions.

 

the saw cant start because of the next reasons
1) no good spark
2 no good compression
3 leaks
4 carburator leaks or problems
5 flywheel key

so check again

 

Rule out severe flooding. Pull fuel supply line off carb. With some fuel mix in the crankcase (probably current state), you should get a burp after 10, 20, 30 pulls...IF enough compression and good spark at the right time. A ball park test of timing - pull plug and recoil - rotate flywheel till magnets are in front of coil legs. Piston should be near Top Dead Center.

 

even and with no carb on the saw must burb if you put gas in the cylinder, maybe he have a bad coil

 

True true. If the carb is off, just put tsp of fuel mix into intake throat. Won't be severe flooding then.

 

and also can check the coil if you dont have the tools

 

Now you can repair the saw

 

Was the new plug wet or dry when you pulled it out? That's the only way to tell what's going on inside the motor as far as not getting enough or too much fuel.

Sometimes I have taken a warm plug from another just run motor, seems like they will fire easier.

 

Bull.......... the saw cant start
Dont need to break yours and ours mind
sent it to the dealer SO SIMPLE

 

That approach can get expensive with poor results.

 

Faulty plugs can spark in the open air, sitting on the head, but won't spark at the 100 PSI plus in the combustion chamber. An old Champion spark plug cleaner-tester will check out a plug in a minute, if you can find one. Otherwise get a new plug or pull one out of a saw that runs. Someone who rebuild old cars or tractors may have a tester, as those old girls use plugs that aren't easy to find now, with their oversized threads. A Champion will do 7/8" plugs.

 

if he go to a good dealer or small engines mechanic the results will be perfect