KymcoForum.com
General => Technical | How To => Topic started by: CROSSBOLT on October 28, 2020, 01:19:39 AM
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Yep, four (4). Not scooter or car but yard/farm type equipment with gas engines.The only reason I even bring it up is the similar causes can crop up in ANY gas engine regardless of size. Two 2-strokes and two 4-strokes.
1. Loss of compression, no start. Was running and shut down for fuel, no restart, free spinning. No resistance to pull start rope. Sidelined until after grass season. 4-stroke Briggs w/ Easy-spin start feature.
2. Failure to run. 2-stroke string trimmer by Echo. Seven years of service, not one failure until now. Still good compression would start and run on choke but faded out when choke opened. Two possibles: pumper carb not pumping or loss of crankcase compression. Was not the carb. One crank seal of two leaking. Seals on order.
3. Chainsaw locked up. Pull starter would not turn engine. Echo 2-stroke worked for seven years. Last use less than 15 seconds then stored. Disassembled to find rust in cylinder! Cleaned cylinder and piston, ring and groove. Starts and runs normal now.
4. Toro zero turn, V-2 Kohler 4-stroke, in use 4 seasons. Fail to start, starter just spinning, Bendix would not extend the pinion. Freed up Bendix but then would not fire. Would fire on propane blown into carb intake so was a fuel problem. Pulse fuel pump worked so drained carb float bowl and removed. Snot (from ethanol fuel likely) in bottom of bowl so cleaned carb. Original battery would not hold a charge so replaced battery with lawn & garden battery I put in UXV500i. Cut a bunch of grass today!
The longest delays were in getting mail order parts like gaskets and one small roller that disappeared when blasted with compressed air. Go figure! The trouble shooting logic is the same no matter brand or type engine. The only differences is recognizing the differences in the systems and proceed from theory of checks to either prove or eliminate each possibility. Avoid repeats unless an error in either proving or eliminating suspected. Like on the mower. There were THREE things wrong! But each one was discovered and proven in sequence. Grass and weeds are HUGE! I will be busy outside well into November with the fading dry spells!
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Certainly keeping you busy eh Karl?
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Well sorted Karl!
Do you "Have Kohler, will travel" ??
Even my pup is looking at my leaves, then back at me, then at the leaves, then back at me, then ...etc.
Hoping for giant wind to make my leaves neighbor's problem!
Stig
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Hoping for giant wind to make my leaves neighbor's problem!
Stig
Ha! Got a better solution Stig, my garden drops away some 30' from the walled patio, so all I need do is use the leaf blower to send them off over the wall and down the drop to have a nice clear patio to sit on. Job done.
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Karl, wow, so trouble comes in..4's? That's a lot of small engine failures to deal with. I like your logical, methodical approach to diagnosing and repairing.
It's getting cold here but most of our leaves haven't even fallen, yet. I haven't raked in years...just mulch mow all the leaves in..but house and landscape are 15 years old now so trees are getting bigger with more leaves. I'd much rather be ridin' than rakin'!
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Like your logic Hawk. Ridin', now there's a philosophy I can go along with.
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Ridin' always top priority!
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"Have Kohler will travel" theme.....
https://www.youtube.com/watch?v=tgvxu8QY01s (https://www.youtube.com/watch?v=tgvxu8QY01s)
Colonel Tom
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have kohler with snow blower 48" will blow snow 60 feet my winter ride
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Kohler on Toro mower doin' fine!
Finally got the parts for the Echo weed eater but reached a snag of needing a press to get the crank case half off. Made a wooden adapter that did the trick!
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Well sorted Karl!
Do you "Have Kohler, will travel" ??
Even my pup is looking at my leaves, then back at me, then at the leaves, then back at me, then ...etc.
Hoping for giant wind to make my leaves neighbor's problem!
Stig
Update...
Karl never showed with his riding mower!!
Wife, daughter, dog and 2 neighbor kids looking at me (they came to my front door - and just stared) and back at the leaves...
So, I mowed the d___ed things.
Stig out....
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Just had a Stihl leaf blower on mine Stig. All looks much neater now.
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Three back in service, one to go!
Final word on the Echo SRM 225 string cutter (weed eater) ALL the service data with color pictures arevavailable on line in either video or pdf format. This mentioned BECAUSE the factory replacement piston ring should be gapped at .020" upon assembly. That seems kind of big but that is about what the original was gapped. The replacement was checked BEFORE assembly at about .0017" which is WAY too small and could seize in the bore when hot!
The fact that service data and procedures are so readily available means that Echo is more concerned about proper servicing instead of whatever Kymco USA is concerned.
What follows is a 10 hp Briggs with no compression. Tune in later for another exciting episode!
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Karl the old B&S industrial motor on my riding mower is close to 30 years old (bought the mower when Dad passed in 93) other then changing oil and battery I've had to change a plastic starter drive gear, that's it. Have gone through two sets of tires and ready for the third set.
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Karl the old B&S industrial motor on my riding mower is close to 30 years old (bought the mower when Dad passed in 93) other then changing oil and battery I've had to change a plastic starter drive gear, that's it. Have gone through two sets of tires and ready for the third set.
The steel sleeve for the cylinder is the winner! Those Echo engines have a steel sleeve. Honda and Kymco, too!
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I should have said batteries. They would only last about 3 years. I'm now using the old AGM out of one of the Kymco scooter's I put a new battery in.
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Update...
Karl never showed with his riding mower!!
Wife, daughter, dog and 2 neighbor kids looking at me (they came to my front door - and just stared) and back at the leaves...
So, I mowed the d___ed things.
Stig out....
The 45mph winds today has solved my leaf issue.....but not my neighbor's 😊
Stig
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The 45mph winds today has solved my leaf issue.....but not my neighbor's 😊
Stig
"But not my neighbor's" is a hoot!
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Update on #4: no compression on Briggs. Did initial teardown this afternoon. Clearance on valves nominal. Removed head. No burned valves, no hole in piston, bore looks good. No obvious reason for no compression.
Suggestions?
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Update on #4: no compression on Briggs. Did initial teardown this afternoon. Clearance on valves nominal. Removed head. No burned valves, no hole in piston, bore looks good. No obvious reason for no compression.
Suggestions?
Could the cam have broke?
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Could the cam have broke?
The cam IS turning because the rockers do their thing in the correct sequence. However, I will check to see if valve timing is correct.
I'm thinking broken rings as a possibility but the cylinder looks to good for that. Stuck rings may be more likely than broken. Your idea has merit and I thank you for it!
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The cam IS turning because the rockers do their thing in the correct sequence. However, I will check to see if valve timing is correct.
I'm thinking broken rings as a possibility but the cylinder looks to good for that. Stuck rings may be more likely than broken. Your idea has merit and I thank you for it!
If the valve timing was off wouldn't the valves hit the piston? I don't know if it's a non-interference engine. The only other thing I can think of is a chunk of carbon not allowing the valve to close all the way. Grasping at straws here.
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If the valve timing was off wouldn't the valves hit the piston? I don't know if it's a non-interference engine. The only other thing I can think of is a chunk of carbon not allowing the valve to close all the way. Grasping at straws here.
Checked the cam timing today and it seemed to be in the correct sequence. I don't think the valves lift enough to touch the piston and there are no marks on it. However, I did find one anomaly in one of the valves. There seems to be an area of no contact on the intake valve seat. I took a felt tip marker to the contact areas of both valves and seats. Exhaust is good but there seems to be about 60 degree arc of no contact. It ranges from 11 to 1 oclock in the picture. On the right of the larger valve seat at about 1 oclock the shiny tapers to black. The tapering at 11 oclock is obscured by poor camera work!
The drill is to get some valve lapping compound tomorrow and lap away the dye marker!