Bummer man 
lucky cylinder
I'm scared of LRB again
lucky cylinder I'm scared of LRB again
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
Help Support Arborist Forum:
I have an oem pin and bearings in my SP81 (LBR piston) with the divided port that was used as an airplane project.
I do remember cleaning the pin and piston with alcohol and a little locktight on the piston surfaces. The pin was extremely tight and squealed in. Ive got over a gallon of mix at least through that saw so maybe I am lucky .
I wish there was an oem Husqvarna or stihl thst would work when vinny sleeves them? That would help tremendously.
I do remember cleaning the pin and piston with alcohol and a little locktight on the piston surfaces. The pin was extremely tight and squealed in. Ive got over a gallon of mix at least through that saw so maybe I am lucky .
I wish there was an oem Husqvarna or stihl thst would work when vinny sleeves them? That would help tremendously.
Boy it would help. Ive had luck with 2 lrb pistons. 82cc and a 70cc. Thats the second piston recently i heard about and saw pictures of that the piston just failed. The other one had the top above the ring break off. Very unfortunate. Lucky it didnt destroy the cylinder though. Id get a oem piston as others have mentioned.
I live right near them. Love the folks. Unless there is a zombie apocalypse, I am out of ammo, arrows, knives, and running chainsaws I will never ever put their stuff in one of my saws.Bummer man
I'm scared of LRB again
gloud
ArboristSite Operative
well I was disappointed to say the least. the pin didn't move and the cylinder just shows marks from the bearing pins on the intake port.. Mark is being gracious and helping me out.
I finally got some imperial hex keys and it seems to be 9/64 for the recoil cover and some 9/64 plus two slotted/torx for the fan housing.
Are there any hidden screws? I have undone the fan housing screws I can see and it doesn't want to come off.
Never mind, I found one hidden at the top behind the starter handle.
Next questions:
Is it possible to replace the ignition lead, ie can it easily be removed at the flywheel end?
Is there any preference of spark plug socket size? I seem to have a mix of 16mm and 19mm...
I ran the 2-10 for about 20 minutes (which was fun!) then it wouldn't restart. I thought I had it tuned OK but after a while it seemed reluctant to calm down at idle. It seems to have no spark now.
North East Tennessee MAC Report
Beautiful day in North East Tennessee today, it was shirt sleeve weather with a slight breeze. Ground was saturated from days of rains so I knew there would be no hauling. Last Tuesday after work, I had scouted 4 trees that I wanted to fall with Brian.
This morning I found just how far I was behind on sharpening chains due to playing with the hexa grind – no sharp chains - so I scrounged through my stock and came up with an odd assembly.
Loaded for bear – PM800 with 33” .404 square ground skip and off-brand 500i with 25” .375 round ground chisel skip.
Brian agreed to meet me at the range. He arrived just in time piloting his side by side. The ground was so slick, my little Deere lost forward progress just sly of the next to last step of the access road. With a long rope putting Brian and his side by side on the step, we were able to get going again. For good measure we kept tethered through the final incline.
Those 4 trees turned into probably 20 trees. We have enough on the ground for many loads if we can just get them out.
One of several “nice” standing dead trees – this one is a red oak.
Brian maintaining his anonymity.
Last Tuesday night, the PM800 took this nice ash. Also felled another good size ash and did a little scouting before dark.
Last Saturday – rain. No cutting. I hauled in a load from the previous Saturday to the woodlot. Later that evening, I went back to the woodlot to fish out the sassafras logs for a contractor to mill for trailer floor boards.
Previous Saturday, access road was dry enough to get the deuce up the hill – so no cutting just hauling. Short day as I had mowing to do. Got 90% of the mowing done and then was rained out. (Due to successive rains, I didn’t get back to mowing until today; my wife helped out so it didn’t take too long.)
First load to the woodlot.
Second load in progress.
Second load ready to go down the access road.
Be safe,
Ron
Beautiful day in North East Tennessee today, it was shirt sleeve weather with a slight breeze. Ground was saturated from days of rains so I knew there would be no hauling. Last Tuesday after work, I had scouted 4 trees that I wanted to fall with Brian.
This morning I found just how far I was behind on sharpening chains due to playing with the hexa grind – no sharp chains - so I scrounged through my stock and came up with an odd assembly.
Loaded for bear – PM800 with 33” .404 square ground skip and off-brand 500i with 25” .375 round ground chisel skip.
Brian agreed to meet me at the range. He arrived just in time piloting his side by side. The ground was so slick, my little Deere lost forward progress just sly of the next to last step of the access road. With a long rope putting Brian and his side by side on the step, we were able to get going again. For good measure we kept tethered through the final incline.
Those 4 trees turned into probably 20 trees. We have enough on the ground for many loads if we can just get them out.
One of several “nice” standing dead trees – this one is a red oak.
Brian maintaining his anonymity.
Last Tuesday night, the PM800 took this nice ash. Also felled another good size ash and did a little scouting before dark.
Last Saturday – rain. No cutting. I hauled in a load from the previous Saturday to the woodlot. Later that evening, I went back to the woodlot to fish out the sassafras logs for a contractor to mill for trailer floor boards.
Previous Saturday, access road was dry enough to get the deuce up the hill – so no cutting just hauling. Short day as I had mowing to do. Got 90% of the mowing done and then was rained out. (Due to successive rains, I didn’t get back to mowing until today; my wife helped out so it didn’t take too long.)
First load to the woodlot.
Second load in progress.
Second load ready to go down the access road.
Be safe,
Ron
Man that log hauler is the berries!!!
Jethro - On most McCulloch branded points and electronic coils the wire basically "unscrews" from the coil. Of course, they often twist off in the pocket of the coil but I've found a hollow left handed drill bit that is intended for removing stripped wood screws that will dig our the wire remnants if you work slowly and carefully.
There is a thin stud like a wood screw in the coil that the wire threads on to. Lately I have been using Liquid Tape to seal the wire when installing a new one but I've used different silicone RTV products in the past with good success.
Mark
There is a thin stud like a wood screw in the coil that the wire threads on to. Lately I have been using Liquid Tape to seal the wire when installing a new one but I've used different silicone RTV products in the past with good success.
Mark
I get confused sometimes.
Mark
Mark
My name is Mark too so that makes things even more confusing. 
The ignition lead unscrewed easily exactly as (other) Mark described and here you can see the "screw" he mentioned:
Mark
The ignition lead unscrewed easily exactly as (other) Mark described and here you can see the "screw" he mentioned:
Mark
More pictures from Saturday's Miss adventures of Ron and Brian and Blind Squirrel Felling.
A tree that I fell with the PM10-10S
Another tree fell with the PM10-10S
The mighty machines used in our adventure today
I had the PM800 with me today but it seen no action.
This is what happens when you let Ron loose with a chainsaw.
In this picture you can see a half circle. This is what Ron encountered on one of the trees he fell. It created a very dangerous situation. It was hidden by the bark of the tree without any of it showing on the outside of the tree. Ron put a wedge their to wedge the tree over, the piece of the tree popped out causing the tree to fall in the wrong direction. It caused a very dangerous situation that could of taken Ron out.
This is where the piece came out of. Notice that the piece that flew out is completely concealed in the bark of the tree without any visible indication that it existed under the bark.
Continued
Brian
A tree that I fell with the PM10-10S
Another tree fell with the PM10-10S
The mighty machines used in our adventure today
I had the PM800 with me today but it seen no action.
This is what happens when you let Ron loose with a chainsaw.
In this picture you can see a half circle. This is what Ron encountered on one of the trees he fell. It created a very dangerous situation. It was hidden by the bark of the tree without any of it showing on the outside of the tree. Ron put a wedge their to wedge the tree over, the piece of the tree popped out causing the tree to fall in the wrong direction. It caused a very dangerous situation that could of taken Ron out.
This is where the piece came out of. Notice that the piece that flew out is completely concealed in the bark of the tree without any visible indication that it existed under the bark.
Continued
Brian
Attachments
More pictures
Ron's mighty PM800 with a 33 inch bar, 404 chain.
Ron cutting down the boob tree a live oak snag with his PM800
Ron notching a ash tree with his PM800
Carnage of the front bumper of the side X side. You know that Ron and I cannot cut a day without tearing up something.
Ron notching another dead ash. Notice the nice chips flying out from the saw. A nice sharp chain.
Ron completing the notch.
And now the back cut.
And now the tree on the ground. Right where he wanted it to fall. Ron is pretty good at felling and putting it where he wants it.
All in all a very good day of felling. A good workout for the McCullough saws. Many trees on the ground and ready to be hauled to the wood lot for processing.
Brian
Ron's mighty PM800 with a 33 inch bar, 404 chain.
Ron cutting down the boob tree a live oak snag with his PM800
Ron notching a ash tree with his PM800
Carnage of the front bumper of the side X side. You know that Ron and I cannot cut a day without tearing up something.
Ron notching another dead ash. Notice the nice chips flying out from the saw. A nice sharp chain.
Ron completing the notch.
And now the back cut.
And now the tree on the ground. Right where he wanted it to fall. Ron is pretty good at felling and putting it where he wants it.
All in all a very good day of felling. A good workout for the McCullough saws. Many trees on the ground and ready to be hauled to the wood lot for processing.
Brian
Reassembled the 55 yesterday. All it needs now is for the paint to be finished and cure on the recoil, and clutch cover. I would have been done except I have got pretty picky on this one and have reworked the recoil and clutch cover paint twice lol. Still not going to be perfect paint on this one. But it's going to be my best paint job ever. The bar cleaned up interesting. I might buff, polish, stencil it and the clear coat. It should look good like that, and since this saw will not be working it will not get worn off lol. 
Well done, sir. Well done.
I took some of my big boys out for a workout yesterday.I had the SP81,the DE80,& the SP125.The SP81 runs great & I love the power to weigh ratio.I don't think it can be beat.The SP125 was used with a very poor chain & didn't last long.We had a huge maple on the ground that my friend pulled over with his truck last yr.At first I used the SP81 to remove the "limbs".Then I used a Homie XP-1000 with a 30 in.bar with .404 chain (this saw is an absolute workhorse).Lastly I used the SP125 till the chain pooped out.I was really impressed with it's power.I've got a new .404 Sandvik chain on it now ready to return next weekend to finish off that maple.The DE80 was used to fell an ash & I was not impressed with it at all.The power to weight ratio basically sucks compared to the SP81.It may be OK for bucking,but not for felling when I had to hold it almost chest high,just too heavy for me.I'll see about getting some pics of the giant maple on here next week.I'm wondering if I'll be able to cut through from both sides with a 36 in.bar.We started out on this tree back in 2013.At that time my biggest saw was a Timber Bear with a 20 in.bar & my only Mac.
Has it started since? Vapor lock, maybe? Outta gas? (It happens!)
I'd be leaning toward an air leak that got worse as you ran the saw. You may still have spark, just way too much air getting in somewhere -- like a totally failed oil seal. Worse case could be a scored piston (due to the possible leak) with stuck rings and no longer enough compression to fire, though I imagine you'd recognize the decrease in compression rather quickly.
Check spark. Check compression. Check intake integrity for tight fasteners, etc. Check piston if compression is low. Do a vac/pressure test to check case and seal integrity.
Similar threads
Want to Buy
McCulloch Super 250
