Ms200t bogging on full throttle

[Pbtaylor2014]

Hi guys i have a Ms200t was low on compression so iv check everything came down to a piston rings so new ones was put in been using it a while to wear in but when you try to put the throttle full on its bogs but if i pull it slowish it will rev up good compression any idea thanks

[spudulike]

Hi guys i have a Ms200t was low on compression so iv check everything came down to a piston rings so new ones was put in been using it a while to wear in but when you try to put the throttle full on its bogs but if i pull it slowish it will rev up good compression any idea thanks

 

What is the compression measurement? If the original rings were shot, I would have replaced the complete piston as a worn one even with good rings can lose compression.

 

Did you hone/roughen the glaze on the bore when the new rings went in?

 

The bogging you are experiencing may just be poor carb adjustment - try putting the H&L on one turn out unless it has an 020T carb where the adjustment can be more varied.

[Pbtaylor2014]

What is the compression measurement? If the original rings were shot, I would have replaced the complete piston as a worn one even with good rings can lose compression.

 

Did you hone/roughen the glaze on the bore when the new rings went in?

 

The bogging you are experiencing may just be poor carb adjustment - try putting the H&L on one turn out unless it has an 020T carb where the adjustment can be more varied.

 

Hi spud had it check by a dealer all is fine he said the saw use to run fine before new rings when in the dealer said it's a little low on comp so i should put new rings in did that and been using since i have a couple of ms200t this is the one that gets a little bit or hard work will try carb again isnt it normally one turn on l and 3/4 on h your the experts so iwill give both a one turn if no joy will give carb a overhaul

[spudulike]

Hi spud had it check by a dealer all is fine he said the saw use to run fine before new rings when in the dealer said it's a little low on comp so i should put new rings in did that and been using since i have a couple of ms200t this is the one that gets a little bit or hard work will try carb again isnt it normally one turn on l and 3/4 on h your the experts so iwill give both a one turn if no joy will give carb a overhaul

 

You would normally start with one turn out on both the H and L screw, if a saw is bogging at low to mid revs on pickup, sometimes it is just the L screw being a little lean. Be aware that many MS200s still have the carb limit caps fitted and these will stop you changing the H screw by much but that may be a good thing as it should run OK on factory settings.

 

If an 020T carb has been fitted, these often run at settings other than 1&1 as there is only one pick up for fuel to feed both H&L screws meaning if you change the L screw setting, the H screw changes as well so more difficult to dial in.

 

I have never just fitted a ring, worn rings usually mean the piston skirts will have excessive wear or enough wear to warrant a new piston. I have had saws make good compression but have no torque just down to a worn piston.

 

What compression does it make on the first pull?

Edited June 25, 2016 by spudulike

[Pbtaylor2014]

I will check and find out

 

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[Pbtaylor2014]

Hi spud just changed the plug retune like you said it's seem to be back to normal no bogging so been running it this morning and will still get you a comp measure

 

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[spudulike]

Hi spud just changed the plug retune like you said it's seem to be back to normal no bogging so been running it this morning and will still get you a comp measure

 

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OK, must have been a lack of fuel on acceleration caused by the L screw. Typical compression on a good MS200 is 170psi and on a well worked one is 150psi, anything below 150 isn't good and the maximum I have seen is 210psi on a modified saw.

[Pbtaylor2014]

Thanks spud will get a reading for you

 

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