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#1
02-17-2014, 09:45 PM
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old yamaha
I know a lot of you know a thing or two about small engines. So I thought id ask for some insight on my 1986Yamaha srv 540 snowmobile, it starts and idles good but it only will drive with the choke on, definitely too lean I think? Trying to figure out how to richen the mix because it only has the air screw on the top of the carb no other adjustments. Of course I cleaned the carb too.
Also going to change the clutch spring but I can handle that.
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122 PTO, lift, deck, weights, and chains clist pick 123 headlights no motor came with the 122 Stx38 free acquisition but its the wrong color works great though Free craftsman gt 17hp Briggs Intek hydro 
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#4
02-18-2014, 06:35 AM
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Remember 2 stroke engines use the crankcase as part of the induction system.
If one has been sitting a long time, the seals on the crank get hard and shrink up, then air leaks into the crankcase. Not sure if that is your problem but it is a possibility. When you take the carbs back apart, but sure to use the tip cleaners from your torches, and run through all of the jets. It is possible you have a clogged main jet.
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#5
02-18-2014, 11:17 AM
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most 2C engines that size have a richness lever for cold starts my cuyuna 430 does . do you warm up the engine before trying to start ? minnesota right
check compression and check the slide operation (if carb)
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#6
02-18-2014, 04:18 PM
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It starts good usually and it's been parked in the shop which is 40℉ I'll replace the fuel lines and impulse line and hopefully I don't have a crank seal out or something
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122 PTO, lift, deck, weights, and chains clist pick 123 headlights no motor came with the 122 Stx38 free acquisition but its the wrong color works great though Free craftsman gt 17hp Briggs Intek hydro
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#8
02-28-2014, 01:58 PM
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Rode it around for a while on Saturday a good couple hours of trail riding still runs with choke on but runs good
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122 PTO, lift, deck, weights, and chains clist pick 123 headlights no motor came with the 122 Stx38 free acquisition but its the wrong color works great though Free craftsman gt 17hp Briggs Intek hydro
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#9
03-01-2014, 12:46 AM
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Something comes to mind from my motorcycle days...
Are you using the factory stock air cleaner/filter assembly? Sometimes the after market air stacks run lean, or did this just suddenly develop? Cubby guy
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Only thing better than having a Cub Cadet is USING one  
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#10
03-01-2014, 02:03 AM
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Not stock airbox, also the exhaust end cap had fallen off so a new piece of steel was welded on and helped a little.
Rode it again tonight for a while same outcome, a half can of seafoam has gone completely through it now
__________________
122 PTO, lift, deck, weights, and chains clist pick 123 headlights no motor came with the 122 Stx38 free acquisition but its the wrong color works great though Free craftsman gt 17hp Briggs Intek hydro
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