What's on your bench today?

[Mesterh]

If you dont mind me asking do you use one of those fancy stihl gadgets that replace the carb to pressure test or just block the carb and exhaust off and pressure through the spark plug hole?

[spudulike]

If you dont mind me asking do you use one of those fancy stihl gadgets that replace the carb to pressure test or just block the carb and exhaust off and pressure through the spark plug hole?

 

To pressure check correctly, you need to blank off the muffler and the join between carb and cylinder. If you blank off the choke side of the carb, you will get some leakage through the carb throttle plate shaft and give you dubious readings - you are checking the crank seals, mating surfaces, inlet boot and impulse line if fitted and not the carb although you can pressure check a carb.

 

I don't use the Stihl unit as I find the price tag a bit high, I have developed my own kit and I do connect through a modified spark plug as it is the most convenient area to do so.

 

Sometimes simple and cheap are the best solutions:thumbup:

[Mesterh]

To pressure check correctly, you need to blank off the muffler and the join between carb and cylinder. If you blank off the choke side of the carb, you will get some leakage through the carb throttle plate shaft and give you dubious readings - you are checking the crank seals, mating surfaces, inlet boot and impulse line if fitted and not the carb although you can pressure check a carb.

 

I don't use the Stihl unit as I find the price tag a bit high, I have developed my own kit and I do connect through a modified spark plug as it is the most convenient area to do so.

 

Sometimes simple and cheap are the best solutions

 

They are always the best.

 

I fashoined up a very simple one that uses the pulse take off on the 020, I jammed a bit of rubber between cylinder and exhaust and between the carb and handle. Worked well enough to see the crank seal leaking.

 

The spark plug one sounds better though and I have a leakdown tester (home made obviously!) so it wouldnt be hard to get that working.

 

 

Cheers for the info.

[spudulike]

Here we go again:001_rolleyes: First picture - carb rebuild on a Stihl 024 - been playing up since I sold it to a local guy so I stripped it down, pulled the welch plug, ultrasonically cleaned it all last evening with a blast of carb cleaner between cleans - refitted the gaskets, needle and plug and gave it a very rough tune but will give it a blast at the weekend.

 

Other pictures - a Husky 268 that hass had a seize, a new ring and the carb has been replaced with a carb probably off an L65 or 280CD as the idle adjustment is from the back of the saw:confused1:

 

Reckon the bore can be cleaned - talking to the owner about a cost effective course of action.

[spudulike]

The 268XP is turning in to an interesting one, I have fitted a second hand piston that is in far better condition and measures 0.08mm larger than the old one - compression is 155psi on a WD40d bore so very good. Pressure and vacuum check 100% fine!

 

The saw has a poor idle and on the last pic, you will find out why, someone has had the welch plug out at some stage and punched a hole through to the venturi and then it has been repaired with some form of epoxy - Mmmm nice:001_rolleyes:

 

Anyone out there got a spare carb for a 266/268XP?

[Jim372xp]

Spud ,just out of interest how did you modify that spark plug you use for testing thinking of making one my self mate.

[combined tree services]

The 268XP is turning in to an interesting one, I have fitted a second hand piston that is in far better condition and measures 0.08mm larger than the old one - compression is 155psi on a WD40d bore so very good. Pressure and vacuum check 100% fine!

 

The saw has a poor idle and on the last pic, you will find out why, someone has had the welch plug out at some stage and punched a hole through to the venturi and then it has been repaired with some form of epoxy - Mmmm nice:001_rolleyes:

 

Anyone out there got a spare carb for a 266/268XP?

 

 

Hi Spud , i have a 266 unit in the workshop somewhere , its yours if you want it , not sure if it runns but your welcome to it PM me if you want it

[spudulike]

Spud ,just out of interest how did you modify that spark plug you use for testing thinking of making one my self mate.

 

You have two options - make one if you are good on the lathe or butcher a plug with a hammer and then mod it with a tube and epoxy - not rocket science just brute force on this one:thumbup:

[spudulike]

Interesting one this one, was given a Zama carb from a Stihl 020T to rebuild, did the normal stuff but noticed this fault - the pumping foil has had holes punctured in the pumping flappers - think I may lightly turn a drill in the holes before reassembly to champfer the edges to stop this happening again

[Goaty]

357xp Sprocket disintegrated going though a pile of wood on oregon easycut sawhorse, doubt that was the cause, its had a hard life. Also snapped needle bearing and lost 1 roller. Fixed now.