What's on your bench today?

[Rich2484]

Did I ever mention I love the 200t saw.

 

This running problem could also be nothing to do with the carb.

 

Remember my episode with one. Done everything expet measure the rings. It would run ok but the moment it got any heat round it it would stop. Replaced the piston and rings and its still going strong.

 

His comp test was 158 cold. Another test and its below 150, pushing into the low comp range.

[Matthew Arnold]

Got a KM100 R on the bench to be drained of fuel, flushed thru and have a look at the piston. It was smoking like a gooden today. We have put the fuel into the contaminated container which was contaminated with about 3 litres of Diesel. Although it doesn't sound like much combined with the two stroke oil it was too oily for our machines.

 

The smoke was blue on full throttle, white/grey on run down and black on pick up. The compression seems OK but fingers crossed the oil rich mix hasn't caused any damage as the engine was bogging down constantly.

[spudulike]

The problems on most saws are normally simple, yet we get carried away into believing the worst.

 

I had a 200t today that was running poorly and changing its state of tune when put into work. Classic symptoms of a split inlet manifold. All you need to do to change the manifold is to undo the rear AV mount and remove the carb. The handle can be lifted sufficiently to remove the manifold. This one was split and so was replaced.

 

There is always a risk that the saw has had prolonged use with a split and has run weak resulting in the bore picking up and a subsequent loss of compression, so I always do a comp test, its quick and informative. This one was 150psi, so good to go.

 

It is also likely that the user has tried to tune out the problem before giving in and getting it repaired, so its best to check the carb screws. These were both 1 turn out, so good to go.

 

4 pulls got it going, it sounded quite good at revs, but died on releasing the throttle. The LA screw would not turn in any more. Strange, so fiddled the L screw, but to no avail.

 

I was now it bit baffled, there should not be more than one problem, so quickly popped on a known good carb. Perfect.

 

So stripped, cleaned and refurbished the original carb (an 020 type S16A carb), put it back on but still no tick over. Really baffled now, but turned my attention back to the idle speed LA screw.

 

This screw would go no further in, but rather than being in all the way, was in fact all the way out, but cross threaded. A clean up of the threads and it was moving freely again and I was able to adjust the tick over.

 

Sometimes it is easy to miss the obvious.

 

Agree Barrie, had one in that was stalling on idle and generally playing up....broken clutch spring:001_rolleyes:

[spudulike]

Took apart. Cleaned everything. All looks fine. Comp test 150psi

 

Ran for a while reved ok... left running.... then reved full on and it struggled at top end a little reved but stuttered once or twice. Then went down to a fast idle when i let go...

 

Checked warm temp comp and it was 140psi...

 

Time for a piston and carb?

 

Zama carb on

 

Trying to see if its worth me bothering with or spares or repairs.

 

Cheers

 

The drop of compression when warm is normal and 150psi cold is also pretty normal for a used saw. 150psi cold and fuelled is a pretty standard reading.

 

The symptoms on not revving out sound like an air leak that is leaning down the saw too much so it can't rev out - possible manifold or even a scored piston - it is possible to get good compression on a lightly seized piston.

 

The symptoms of holding on to revs when the throttle is closed sound like a crank seal letting air when the crank case is under vacuum - increased when the throttle is closed! the extra air tends to make the saw hold on to the revs when it should snap down to idle.

 

Don't change anything - you have three toppers - swap a good carb and try again, prove it is either the carb or something else on the saw before spending out further on it.

[spudulike]

Did I ever mention I love the 200t saw.

 

.

 

No Rich, I thought you were a Husqvarna man:lol:

[Rich2484]

No Rich, I thought you were a Husqvarna man:lol:

 

Didn't you know

 

I'm a ryobi man

[spudulike]

Didn't you know

 

I'm a ryobi man

 

Well, you can tell by the way I use my walk,

I'm a Ryobi man, no time to talk.

Oiler knackered and bar warm.

Its been kicked around since it was bought.

 

or

 

Comin' to ya on a dusty road

Good logs I got a truck load

And when you service it you got something

So don't worry cause I'm coming

I'm a Ryobi man

I'm a Ryobi man

[peatff]

Didn't you know

 

I'm a ryobi man

 

Were they the missing link between Neanderthals and Homo Erectus ?

[Peter]

Anyone got the IPL for one of these?

[Rich2484]

Randy will Peter. :lol: