Jules083
ArboristSite Operative
Trying to come up with a plan for my 372XP. Here's what I have:
Bought the saw used from a logger for $300. Didn't quite run right, figured the price was right and I could work out the bugs. Used it for a winter a little, probably 3-5 cords. Kind of used it as a novelty but still grabbed the old one when it came time to do the work, which was not my intention at all.
What I know is that I was told the saw has a big bore kit, and the PO ported and polished the cylinder. Also I know that it has a lot of hours on it, and I think he put one tooth bigger chain sprocket on it but I haven't been able to confirm that. I think stock is a 7 tooth, I guess I need to pull the chain and count them.
What the saw does is run awesome when wide open and screaming. At every other condition it runs poorly. It seems once you get below a certain RPM it just falls on its face and bogs out. If you start to bog it down too far it'll pull less than my 55 Rancher, but wide open and close to redline it cuts twice as fast. I hope that made sense. Also throttle response is terrible, and the idle 'hangs'. Compression feels a bit less than my Stihl 041, I'll check it with a tester in the morning to verify.
I think getting rid of the amateur porting and polishing that was done would probably be an improvement. He said himself that he didn't know what he was doing, just copied what he saw was done to other cylinders. Remember that he did log with this saw, on his porting, so it can't be all bad. Also worth noting that he buys a new 372 every 6-8 months, and had 2 more after this one and gave up on them all together. He used to go with a ported 372 and a stock 390. Now he carries 2 390's, one of which sits in the skidder.
My idea is to buy a new cylinder kit, regardless of the compression readings. Once that is done I could start tuning the carb and see where I'm at. I want the bottom end power, if I lose the over-rev that's ok. I'm here to cut a pile of firewood, not win a race.
Thoughts?
Sorry for the rambling, I may be drinking beer. I'm trying hard to be clear and concise, not sure if it's working......
Bought the saw used from a logger for $300. Didn't quite run right, figured the price was right and I could work out the bugs. Used it for a winter a little, probably 3-5 cords. Kind of used it as a novelty but still grabbed the old one when it came time to do the work, which was not my intention at all.
What I know is that I was told the saw has a big bore kit, and the PO ported and polished the cylinder. Also I know that it has a lot of hours on it, and I think he put one tooth bigger chain sprocket on it but I haven't been able to confirm that. I think stock is a 7 tooth, I guess I need to pull the chain and count them.
What the saw does is run awesome when wide open and screaming. At every other condition it runs poorly. It seems once you get below a certain RPM it just falls on its face and bogs out. If you start to bog it down too far it'll pull less than my 55 Rancher, but wide open and close to redline it cuts twice as fast. I hope that made sense. Also throttle response is terrible, and the idle 'hangs'. Compression feels a bit less than my Stihl 041, I'll check it with a tester in the morning to verify.
I think getting rid of the amateur porting and polishing that was done would probably be an improvement. He said himself that he didn't know what he was doing, just copied what he saw was done to other cylinders. Remember that he did log with this saw, on his porting, so it can't be all bad. Also worth noting that he buys a new 372 every 6-8 months, and had 2 more after this one and gave up on them all together. He used to go with a ported 372 and a stock 390. Now he carries 2 390's, one of which sits in the skidder.
My idea is to buy a new cylinder kit, regardless of the compression readings. Once that is done I could start tuning the carb and see where I'm at. I want the bottom end power, if I lose the over-rev that's ok. I'm here to cut a pile of firewood, not win a race.
Thoughts?
Sorry for the rambling, I may be drinking beer. I'm trying hard to be clear and concise, not sure if it's working......
