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What compression shoulld I expect

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Bill

02-10-2001 06:39:33




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Have two Sears chain saws. One runs fine, one won't pull gas from tank. One suggestion was to check compression, but no one mentioned what compression should be. I checked the saw that wouldn't pull gas about 60psi, checked the saw that runs fine, it also was about 60psi. So I would assume this pressure is okay, or should it be different? Also does anyone know of any good service maunals for 2 cycle engines and where to get them?

Thanks..
Bill

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walt

02-10-2001 08:21:22




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 Re: What compression shoulld I expect in reply to Bill, 02-10-2001 06:39:33  
If its been sitting, then guess it would gummed up.ie gas turned to varnish in the carb. Remove and soak in carb cleaner. Lots of little openings, best blow out with compressed air.



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Al English

02-10-2001 07:21:55




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 Re: What compression shoulld I expect in reply to Bill, 02-10-2001 06:39:33  
Hi Bill, I used to hop-up 2-cycle road bikes when there was such an animal. Although I've never done a compression test on a saw, 60PSI sounds low. That could be due to how fast you pulled the rope, but you have one that runs fine at 60PSI, and even if this is low, I don't think it would be the cause of your problem. First, confirm that you have a good strong spark. If the spark plug doesn't look like new, replace it to insure this isn't the problem. Next, try putting a little fuel in the carb inlet. If the ignition is really ok the saw should run for a time. On to fuel. Chain saws have a carburetor that also pumps fuel from the tank to the carb. The diaphram and valves in this mechanism are notoriously troublesome and likely suspects. The tank will have a filter on the on the pick-up. These can clog with dirt or deposits from old fuel. The fuel tank cap has vent with a check valve in it, be sure this is working. If the saw runs with the cap loose but quits shortly after the cap is tightened the cap isn't venting. I bought a brand new string trimmer that had this problem. If none of this works I'd say the saw is just lazy. Good luck...Al English

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Brian G.

02-10-2001 09:15:30




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 Re: Re: What compression shoulld I expect in reply to Al English, 02-10-2001 07:21:55  
Al, Ever ride a Kawasaki Mach III 500cc triple? That was my first bike. It was 1971 and I was 30 at the time. It's a wonder I didn't get killed!!Fastest production 1/4 mile bike at the time, and the "squirreliest" thing I ever rode. Then they came out with the Mach IV 750cc triple!! Kinda like the snowmobiles of that era; unsophisticated and a bear to handle.



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Al English

02-10-2001 09:59:56




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 Re: Re: Re: What compression shoulld I expect in reply to Brian G., 02-10-2001 09:15:30  
Hi Brian, I had a street driven 750 Kawasaki that would run a 10.4 second 1/4 mile time. I got a LOT of tickets riding that thing. Fortunately for me, youthful reflexes made up for my lack of wisdom, and I only have one scar from the time I spent on that bike. I modified a lot of things both internally and externally. It attracted a lot of attention, and poeple began asking me to hop-up their bikes. No one ever spent the time and money to do everything I did to mine, but we had some pretty fast Kawasakis running around here for a while. I improved the handling on mine quite a bit, but it was more of a challenge to ride than the considrably faster bikes that are available today. I still have it, but after a minor wreck many years ago I stopped riding it. I recently rounded up the needed parts and one of these days I'll get it back on the road. There is an entire generation of young guys that have never heard what one of these sounds like, so it should be fun...Al English

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Brian G

02-12-2001 06:21:12




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 Re: Re: Re: Re: What compression shoulld I expect in reply to Al English, 02-10-2001 09:59:56  
Whoda ever thought these bikes might become collectibles? Actually, a well restored example should be quite popular at shows as they were the beginnings of the "superbike" era.



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John C. (ca)

02-11-2001 22:39:39




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 Re: Re: Re: Re: What compression shoulld I expect in reply to Al English, 02-10-2001 09:59:56  
Dragging out the memories.. I had one in the late 70's, in one word "SCARY". I agree I don't know why I didn't kill myself either. This one was Hopped up also. Remember one time was going down the Hiway at 80 or so, Dropped it down a gear and the front end came up way too fast. Won alot of street races at the time. I sold it after about 4 years, the guy that bought it had it about a week then it was stolen, The police found it two weeks later it was stripped down to the frame and never seen again. I was very sad to see that happen but I guess it helped other ones live on.

Thanks for trip down memory lane

John Cooper

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