What's on your bench today?

[wyk]

On my bench right now is a Proto compression tester. I must just be hell on them as this is the second compression tester I have managed to injure. The valve died on the last one on it's way north of 180psi. So, I find a hell of a deal on a Proto and it is working just lovely until I hit the pressure release and it actually broke! The nut that used to hold it to the quick release is now free-wheelin. I am in the middle of nowhere Ireland, so this is just a bit inconvenient. How does one go about replacing this thing? I doubt Woodies have it, and Ireland is not like the US as far as having a pneumatic shop around the corner... Looks like another trip to ebay if I can;t find it in Caulfields...

[wisecobandit]

That sucks mate. You can get a new valve for your other tester through snap on tho.

I need to order 1 for mine as I blew it on a 260 im playing with at the mo.

Seems we all go thru spates at similar times when it comes to blowing valves on testers.

[wyk]

That sucks mate. You can get a new valve for your other tester through snap on tho.

I need to order 1 for mine as I blew it on a 260 im playing with at the mo.

Seems we all go thru spates at similar times when it comes to blowing valves on testers.

 

There's a Bergen on EBay for cheap delivered to Ireland. It has a pressure relase on the quick connect part. At least this way I will have yet another gauge as back up if I scavenge it. This will be three now. My old Mercury outboard gauge only goes to 160 now. Ported Jonsered 77cc with pop up piston? 160psi! Ported MS361 with lathe work that has already yanked the started out of my hand - 160psi! Thank you Mercury - that gauge was 50 bucks.

[swinny]

Bloody 200t

 

Still giving jip. Its been high idling and messing about... checked impulse boot and pipe all ok. Changed carb was ok.

 

Only seem to get problems when it warms up. Good compression 155 psi. Now it runs then idles and then after awhile stalls....

Seems a shame to get shut of it but if it keeps playing up its going.

 

Any suggestions? Will have to get my other saw out now.

[Ray1]

Rich had a problem like this a while back, I think it turned out to be lightly seized.

[wisecobandit]

Bloody 200t

 

Still giving jip. Its been high idling and messing about... checked impulse boot and pipe all ok. Changed carb was ok.

 

Only seem to get problems when it warms up. Good compression 155 psi. Now it runs then idles and then after awhile stalls....

Seems a shame to get shut of it but if it keeps playing up its going.

 

Any suggestions? Will have to get my other saw out now.

Done a pressure test on the main seals?

Assume you have tried it with the filler cap loose as sounds a bit like a fuel tank breather issue.

[Rich2484]

Rich had a problem like this a while back, I think it turned out to be lightly seized.

 

You got a good memory.

 

Done a pressure test on the main seals?

Assume you have tried it with the filler cap loose as sounds a bit like a fuel tank breather issue.

 

Maybe try the fuel tank vent.

 

But the one I had was actually worn rings. They hadn't scored the pot, and there was no sign of a seize.

 

I had to measure the width of the rings around, start at one of the open ends and work your way round using calipers or micrometer.

 

Same symptoms and had me in circles. Let me know what the measurements are, there is no book talk to say how wide they should be, I had to measure some new ones.

 

Edit. And the compression was a good reading aswell. Just shut down when it got a bit warm.

[spudulike]

If the saw runs fine on a different carb with no sign of the issue then it is the carb that is the issue.

 

You then need to work out if the issue is on the high speed circuit or low speed and then work on that part of the carb....or fit a new/known good one.

 

If it won't run on a known good carb then I do a pressure/vac test, check the piston/pot and then rebuild knowing the base machinne is in good order.

 

Common faults on these carbs are check valves, accelerator pumps and leaking welch plug.

[Ray1]

Does it get problems with both carbs?

[wisecobandit]

Does it get problems with both carbs?

They are prone to accelerator pump problems on the carbs on these.

Most either block the the accelerator pump side of the carb off or use a carb from an 020t which didn't have the accelerator pump.