RLS7201
Beautyful Downtown Gladstone, MO
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Joined: 10/26/2002
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To add to what Roger10378 said. The cupping that you saw on the exhaust valve would cause the exhaust valve clearance to diminish, thus a loss of compression. Did any of the shops run a compression test?
Richard
95 Bounder 32H F53
460/528 stroker
Web Master
MWPSchooners.com
First brake job
1941 Hudson
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jkwilson
Indiana
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Joined: 06/14/2010
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You can buy a new carburetor for it for $35. I used to hate swapping parts, but as cheap as they are and as many problems as they have because of ethanol fuel, it’s often the easiest and cheapest solution. Verify you have spark under compression and if you do try an eBay carb.
John & Kathy
2014 Grand Design Reflection 303RLS
2014 F250 SBCC 6.2L 3.73
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ScottG
Bothell Wa.
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Joined: 02/25/2005
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From my experience with small engines in general, I would put my money on that ex. Valve. They tend to wear the guides and seats. I would have a machine shop replace both those parts.
Actually, as another old guy, I would take what I learned so far and buy a new gen.
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groundhogy
PA
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Joined: 12/17/2014
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Had it to 3 shops
Shop 1: petes Cycle in crummy baltimore (my hometown): he got it to run. Died after 10 hrs. I couldn’t get it started.
Shop 2: he had me buy a new carb when I knew it wasnt the carb because I know how to clean the carb
Shop 3: he pulled off the valve cover and adjusted valves. Could get it to try to start with starting fluid.
One thing I am wondering. It has spark. But is it possible to have a weak spark? I had this on my furnace (which i also had apart many times. Lol) where i had to increase gap to make a hotter spark.
Generator has a new spark plug
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groundhogy
PA
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Since i have it apart, should i just buy a cylinder and new valves?
When you buy them new, are the mating surfaces all perfect?
Do the valve guides come with cylinder?
If so, i can make the unit like new, without needing to visit the machine shop which is 3 hours drive from my current location.
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groundhogy
PA
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Petes Cycle guy reported that he decarbonized.
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badsix
north bend or.
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Joined: 03/11/2017
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yep, you should have checked the compression first. one of the shops you took it to must have? if you have good compression no need to disassemble the engine i'm thinking electrical problem and they can be hard to track down could be CDI box or stator.
Jay D.
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badsix
north bend or.
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Roger10378 wrote:Another problem with small engines is that the valve seats wear enough that the valves don't seat anymore. Did you check the gap before you disassembled? If not you need to reassemble enough to check. If there is not enough gap between the valve and lifter you will have to grind enough off the valve stem to get the right gap. I don't know the spec for your engine but it is usually in the .005-.010 inch area.
YES, this is the main culprit when you have low compression on these small engines.
Jay D.
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theoldwizard1
SE MI
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Joined: 09/07/2010
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BobsYourUncle wrote:If your valves seating properly is an issue, or you think it's an issue, you could try "lapping" them.
If it is a part, you might a well "lap" the valves. Several videos on YouTube on how to do it (this procedure is NOT engine specific, just don't go crazy; it only takes a little).
I don't know if that engine has a compression release (typically a mechanism that will hold the exhaust valve open slightly longer). You need to disable it and do a compression test. You should be get around 100 psi.
As you are re-assembling, check to make sure you are getting spark.
The old saying is "you need fuel, air and spark", but you also need compression and they all have to happen AT THE RIGHT TIME !
Good luck, keep us posted.
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theoldwizard1
SE MI
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groundhogy wrote:One thing I am wondering. It has spark. But is it possible to have a weak spark?
All small engine have had electronic ignition for the past 30-40 years. It either has adequate spark or it will have no spark.
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