Clinician
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Post by 90gtvert on Apr 23, 2014 12:14:02 GMT -6
Here the loaner tool programs at AutoZone, Advance Auto, etc.. generally require you to pay full price for the tool up front. You use it and bring it back with the receipt they should give you and then you get a full refund if the tool is still in good shape. Can't just grab a tool off the shelf and do this, you have to talk to them and tell them you want a loaner tool. No idea what's available or what stores are where you are though.
If you can blow through your current exhaust pretty easily and feel air coming out the other end, it's probably fine. Old pipes can be cleaned out with a caustic soda, but don't use that on aluminum. If you Google "decoking" or "de-coking" and two-stroke or 2T pipe/exhaust you should see all sorts of info on cleaning exhausts out.
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Clinician
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Post by 90gtvert on Apr 20, 2014 16:29:26 GMT -6
The amount of smoke looks acceptable to me. Hard to tell too much just with smoke since different oils produce different amounts of smoke. At any rate, 32:1 to 42:1 premix is good with most 2T oils. You can get away with leaner (50:1) with some synthetics intended for lean ratios but otherwise leave it to 32:1 - 40:1 premix. I suggest synthetic in all 2Ts. It's a harsh environment (it's tough greatly overpowering the 4T 50s without a dedicated oiling system).
I don't suppose you checked the piston ring end gaps while that was all out or have any idea what the actual compression psi is? You could pull your hair out tuning a carb on an engine that has other problems.
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Clinician
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Post by 90gtvert on Apr 19, 2014 9:39:22 GMT -6
Howdy fellas. JR asked me to pop in if I had any ideas.
It could just be flooded? Have you tried holding the throttle wide open while you crank it over? If a 2T gets flooded sometimes the fuel will puddle in the crankcase. In that case you can remove all fuel supply and the plug will still come out wet when you turn the engine over. Either have to dump it out or siphon it out. Can't rely on it evaporating if there's much in there.
I really don't have experience with the Razz, but 71psi sounds too low to ever be a healthy runner. 6.3:1 could be a corrected compression ratio, not the compression ratio most of us think of. 71psi may be the correct spec, but I find it somewhat hard to believe that a chain drive scoot with 71psi compression test reading will ever run very well.
I would definitely check the reeds. Easy check is holding them up to light and seeing if any shines through. You may be able to get away with flipping the reed petals over. Maybe not, but it's worth a try for a quick fix. I've had engines running poorly and backfire and blow the reeds apart.
If the float level is set too high it could flood, but fuel will often overflow from the carb.
If you take the exhaust off and look up into the port with a light you may be able to get a look at the rings. They sometimes get stuck from buildup on 2Ts.
You can have a spark, but a weak spark may not ignite the mixture... especially if the mixture is not ideal to begin with.
Since it happened after cleaning the carburetor, never hurts to scrutinize your work there.
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