Ms200t bogs when warm

[deanopolini]

Bought a seized ms 200t fitted a new cylinder piston gaskets ect it started straight away revs out fully until hot then decides to bog and die have replaced plug, fuel lines, implulse line also check its not nipped , tryed two diffrent carbs that have both been checked and cleaned out well saw was running fine before seizing really am stumped doin my head in all a can think of now is bad oil or blocked tank vent ? I have just took muffler off as heard they fill with carbon and causes bogging this one has no arrstor screen so ive split it and goin to clean it out aee if that works also could be crank seals but heard its rare for them sorry for long story haha thanks in advance 

[felixthelogchopper]

Have you checked the compression on it? It may be getting low enough when hot to cause the problem.

[EricBradley]

Why did saw seize in first place has that problem been cured, you need to pressure test the crank seals ideally. Most likely be the coil breaking down when warm, quite common fault.

[spudulike]

Either both carbs are faulty or you have HT issues. The crank seals may be leaking but these tend to give idle issues and don't tend to leak that much.

The HT lead can breakdown where it goes under the pump, seen that before. Only seen one coil go, tend to be pretty reliable. You can test the lead with a spark tester. Jumping the spark over the testers bigger gap shows any insulation breakdown in the HT lead. Worth changing the plug and checking the tank breather as they can get partially blocked. 

Carbs can give issues and these C1q carbs need a few specific tests to ensure they work well and not just a new kit fitted.

 

[billpierce]

Was it a decent cylinder and piston fitted? My money is on a crappy cylinder and piston which looses compression when warm or hot

[bmp01]

4 hours ago, billpierce said:

Was it a decent cylinder and piston fitted? My money is on a crappy cylinder and piston which looses compression when warm or hot

You'd struggle to start the engine in that case. ..... the man says "it bogs" so presumably it does run when hot just badly.

 

Deano,

Wind the  low speed mixture screw out a 1/8 turn then another 1/8 turn. ... Oh you've done that already?

 

Can the engine be persuaded to higher speed when hot, if you accelerate it gently? 

 

If it were only the one carb I'd say damned accelerator pump (in the carb) but tried two carbs so I'd say damned accelerator pumps  Unless one or both carbs have been tested on another saw and proven to be good, I'd say they are still suspect.

 

Good luck,  make sure you find why it seized in the first place or is going to happen again. 

[EricBradley]

27 minutes ago, bmp01 said:

You'd struggle to start the engine in that case. ..... the man says "it bogs" so presumably it does run when hot just badly.

 

 

Says it bogs and dies so could be lack of compression. I'm still going with the coil especially if its one with a brown back rather than the ever reliable blue backed ones.

[spudulike]

Can we confirm that it has a new OEM kit on it or some other Chinese poop and it is also worth making sure the piston was fitted the correct way round!

[deanopolini]

On 01/10/2017 at 12:02, billpierce said:

Was it a decent cylinder and piston fitted? My money is on a crappy cylinder and piston which looses compression when warm or hot

Tbh mate the first cylinder was a cheapo which plug threaded straight away then got a better one cant remeber name jus not stihl 

[deanopolini]

On 01/10/2017 at 16:33, bmp01 said:

You'd struggle to start the engine in that case. ..... the man says "it bogs" so presumably it does run when hot just badly.

 

Deano,

Wind the  low speed mixture screw out a 1/8 turn then another 1/8 turn. ... Oh you've done that already?

 

Can the engine be persuaded to higher speed when hot, if you accelerate it gently? 

 

If it were only the one carb I'd say damned accelerator pump (in the carb) but tried two carbs so I'd say damned accelerator pumps  Unless one or both carbs have been tested on another saw and proven to be good, I'd say they are still suspect.

 

Good luck,  make sure you find why it seized in the first place or is going to happen again. 

Have fiddled with screws mate and it havent really tried featherin throttle tbh ts fires straight back up one gone off but bogs straights away again might have alook at the carbs pal thanks