newbury
Super Star Member
- Joined
- Jan 8, 2009
- Messages
- 14,169
- Location
- From Vt, in Va, retiring to MS
- Tractor
- Kubota's - B7610, M4700
Your 372XP is 71CC, are you saying it cuts faster than a 60 to 50CC Stihl? or did you mean 10-20 cc bigger Stihl?I致e used both and I prefer Husqvarna. I think most Stihl people are wearing blinders. I致e had multiple people that wouldn稚 acknowledge my 372XP cuts faster than their 10-20 cc less Stihl saw.
I used to do a bit of chain saw milling (CSM) with both my Stihl 660's (one at a time). Cutting 20" wide logs 12' long into 1 to 2 inch slices heats a saw up.That's a good possibility. Breaking down under heat is a common failure mode for the ignition module, only to have it work just fine when it cools back off.
Another possibility is vapor lock: if it is exposed to too much heat, the fuel vaporizes in the fuel line (or some other place where it's supposed to still be liquid). Often, this won't happen while the saw is running, since the constant flow of fuel brings in fresh, cooler fuel to the area before it has a chance to warm up and vaporize. When you shut down a saw that has been working hard, the heat can soak into parts of the fuel line, vaporizing it and making the saw hard to start.
One thing you can try to help vapor lock: after working the saw hard, try letting it idle a bit, or run under light loads before shutting down. This will allow the saw to cool a bit before shutting down & stopping the flow of fresh fuel to hot areas.
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Never had a problem starting them back up after a break but always let them idle down a bit after i pulled them out of a cut. I try and do that with all my petrol engines.
My first Stihl was an 021, it replaced a buck saw. I read the manual for starting it, full choke, pull till it pops (usually 2 to 4 pulls unless it's been sitting for months), half choke and it fires. It's been that way since about 1990 when I bought it. So I always treated my 660's and 088 the same way.
The only time I had a "major" starting problem was back about 2010. I was laid up with a back injury and the saws set with ethanol ladened gas for about 6 months before I could get to them. All my saws (2 Stihls, an Efco and a JD) were non-starters. I added Sea Foam to fresh fuel and let it work through, giving each saw several pulls a day. It took a while but it cleaned out all the fuel lines and they have all run well since. I probably should replace all the fuel lines, but Sea Foam has been easier.