Dropped Ms200t about 30% revs on start up

[Johnleddo]

So my ms 200t got dropped from the tree last week about 10ft. Checked it over and it'll start up no problem but once its started it reving at about 30% of full revs. I've had a look in the handle and all the linkages seem to be ok. 

 

Has anyone got any ideas what might be causing it to hold higher revs like this. Could the carb need re tuned? As always any help greatly appreciated.

Thanks

John

Edited January 13, 2018 by Johnleddo

[htb]

take air filter and cover off below it(2x8mm nuts), check the linkages to carb are ok and the throttle butterfly is closing onto the idle screw and opening fully  when opening throttle.

Should not need retuning after a drop, something has come adrift or out of line

[Johnleddo]

Ok will do thanks, I've had the air filter off and the carb cover &all the linkages seem ok and are operating. Didnt check the throttle butterfly tho so will have a look at that tomorrow.

[spudulike]

Was the idle OK directly after the drop? Have you changed the carb settings since dropping it? If you take the air filter off, is the choke fully open with the choke in the OFF position?

[Johnleddo]

Had a better look at the carb this morning and the throttle butterfly is fully closed and seems to be opening correctly when the throttle is operated.

 

The saw started to idle fast immediately after the drop and has done since.

 

Ive not touched the carb settings i figured they might be the last thing to suspect as they were all good before the drop. The choke butterfly is fully open with the choke off.

 

Thanks for all the input 

[Graham]

Maybe, somehow, the drop has jolted the crank and a seal is leaking?

[bmp01]

1 hour ago, Graham said:

Maybe, somehow, the drop has jolted the crank and a seal is leaking?

Or the intake boot thingee (between carb and engine) or impulse line.

Fuel line could have been tugged if the weight of fuel filter got thrown about. ..

 

[spudulike]

6 hours ago, bmp01 said:

Or the intake boot thingee (between carb and engine) or impulse line.

Fuel line could have been tugged if the weight of fuel filter got thrown about. ..

 

And that is why I asked the question - most likely the impulse line has been pulled off (tube just under the air box on the starter side) but is possible you have split or dislodged the manifold. Check it out, don't be tempted to run it, you will kill it!

[Johnleddo]

Thanks for the info I'll take the carb off when i get chance and see if anything has come adrift or damaged.

[spudulike]

You won't see the impulse line from taking the carb off - see my original post .....it is UNDER the air box and comes out of the top cover that is part of the fuel tank and locates to the bottom of the air box.