Dolmar 133

[Richsark]

Hi everyone

I got my 133 out today to log up a biggish tree this morning, it started perfect but it seem to have lost power and its not running high enough revs.

It also seems to be hunting abit, I cut through the trunk three times ( 36" diameter ) but it was slow and struggling it got worse with each cut,

I've misplaced my manual got from a online site so I can't trouble shoot it.

Can anyone help please:001_smile:

Regards Rich

[spudulike]

Hi everyone

I got my 133 out today to log up a biggish tree this morning, it started perfect but it seem to have lost power and its not running high enough revs.

It also seems to be hunting abit, I cut through the trunk three times ( 36" diameter ) but it was slow and struggling it got worse with each cut,

I've misplaced my manual got from a online site so I can't trouble shoot it.

Can anyone help please:001_smile:

Regards Rich

 

Hopefully, you used new fuel in the saw otherwise you may have had a small seize.

 

Other than that check the fuel filter us clean, the fuel line is OK and the gauze filter in the carb (other side of the carb from the diaphragm) is clear of woodchip.

 

The carb may just need tuning.

[Richsark]

Thanks I will try those things, I've been meaning to change the filter for some time.

I would live to retune the carb but I've misplaced the manual it was cd copy found the case.

If anyone knows the spec it has three screws.

Thanks,Richard

[spudulike]

Thanks I will try those things, I've been meaning to change the filter for some time.

I would live to retune the carb but I've misplaced the manual it was cd copy found the case.

If anyone knows the spec it has three screws.

Thanks,Richard

 

OK, one screw is the idle - this has a conical end and DOES'NT go in to the carb body.

 

You will have two other screws, the one nearest the cylinder is the low speed screw "L" screw - try turning it out one turn after screwing it fully in... to start with.

 

The other is the H screw, give it two full turns out from fully in, start the saw. When revved flat out, it will probably smoke like hell and be pretty flubby on the top end - turn the screw in bit by bit until it sounds a little flubby on the top end but doesn't scream.

 

Most saws run both screws 1 turn out on the H and L screw but it isn't a definite as there are one or two exceptions.

 

If the H screw is wound too far in, the saw will lean seize due to lack of fuel/oil mix so it is also worth checking the colour of the spark plug after cutting a couple of rings.

 

Light tan colour is good - see below, far left is good, the other two came from seized engines:thumbdown: I did fix them though:thumbup:

[Richsark]

Thanks spud I've just ordered some fual filters when they arrive I will give it good clean change the filter and tune the carb. I will let you know how it goes, many thanks