ms250 rpms

[Subieman406]

what are the rpms for the ms250 idle and top free load rpms and load rpms

 

[fixit1960]

It shows 12,500 on the top, 2800 idle I would suspect. Just below clutch moving the chain.

 

[Subieman406]

ok i got a ms250 reaching 14500rpms limiter caps still in place and completly stock will idle right around 2800-3000 and die on (intermittent) from time to time when saw gets hot but is not consistent so i think i have a leak somwhere

 

[blsnelling]

There is no load RPM. That number will vary greatly.

 

[watsonr]

Remove the limiters and retune. If you can get the numbers down with a small adjustment, might not mean you have an air leak.

 

[Subieman406]

i am about to pull the limiters and we will go from there and see

 

[blsnelling]

Do you even have an adjustable H needle?

 

[Subieman406]

yes its a full needle and it had the limiter on the h jet but not on the low and the peak free rpms is 14670 +- 20 rpms and the saw will run fine one day then the next day once hot it will idle for about 2 minutes and then it will die. rpms is thru the roof on this saw at wide open throttle and ive checked all the hoses and they are good ive checked the carburetor and nothing clean as can be. also the fuel thru it is 50-1 96 octane and eth free. throwing me for a stump have to vac and pressure test next if this readjusting after the cap is off dosnt work

 

[blsnelling]

I don't see where the confusion is. The saw has an adjustable carb, it's tuned lean, and running too fast. If the piston isn't fried, re-tune and be done with it. It's not uncommon at all for a saw to be lean from the factory. Did you just buy the Tach and find out how lean it was?

 

[watsonr]

I've seen the tune move based on weather. Really simple and if it doesn't work, then a vacuum and pressure test would be in order. @14,500 that saw won't last long.

 

[Subieman406]

ok well I tested the saw and the pressure and vac test passed, and the rpms are still hitting 14600 ruffly and I have had this tach a while and the saw belongs to a friend said he was having a issue I told he to let me look at it and this is what im finding there is no leak in the saw and the fuel lines and the gaskets are all new as of last night and the carb was reset to factory and then adjusted from there to richin it up a bit and the rpms are droping down to 13000+- 500 but will jump every 1-2 minutes up to 14000 or more and then back down at wide open throttle to 13000 or a little more I know this is a leak but im having a issue finding it and its only intermittent when hot im not a stihl guy anyone have any ideas that I might just be over looking and would a bearing failure cause this

 

[Subieman406]

found the leak it was on the carburetor bottom side of it and was a little pinhole leak tested it twice cold nothing get the carb warmed up by running saw and then pulled the carb really qwick and what do u know tinny tinny little leak on the gasket I can really see any problems on the gasket but it was there and I got a new gasket in it and its seems to like it a lot runs right at 13200 and holds steady and idles right as well

 

[Deets066]

The ms 250 that I worked on did have an h, an l, and a low idle adjustment. The hole for the l adjustment is not in the plastic filter cover, but in the handle itself which is black and hard to notice. Why they put it there is beyond me but it should have one.

 

[AKDoug]

The ms 250 that I worked on did have an h, an l, and a low idle adjustment. The hole for the l adjustment is not in the plastic filter cover, but in the handle itself which is black and hard to notice. Why they put it there is beyond me but it should have one.

They put it there because it has to line up with the carb...not much choice in where to put it