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The struggle continues. I replaced the MAP sensor 1st. No difference other than a harder start than usual on the 1st start. Normal after that. Then the coil, which did improve the running characteristics, but not eliminate the misfiring. Under load (driving) full throttle it ran good. Part...

Can I delete this system and simply vent the fuel tank like normal, simple lawn tractors do? Do other SxS's use fuel evap. systems? It truly seems overly complex for this little ~450cc engine and 5 gal fuel tank. Seems like a good idea since I don't know much about them, other than 95% of the...

Update: Based on the MAP sensor testing, I ordered and received a replacement ECU. I purchased it used from an Ebay seller. I installed the new ECU and performed the same MAP sensor test to see if anything was different, which to my disappointment, it was not. One demerit for the WSM on this...

I tested the fuel pressure and it was fine. It started off at about 34# with engine off and climbed to 38# with the engine running. Then I decided to test the crank sensor, which tested ok thankfully. Then I decided to test the intake air pressure sensor. This was a bit confusing by the...

That's great! I'm waiting for my new fuel pressure test kit. I did find my old one but it doesn't have any fittings to go to a barbed connection. I re-set the governor control linkage (per shop manual) and tested some sensors last night. The IA and ECT (temp) sensors checked out ok. I need to...

29.95k ohm on the 2ndary of the coil, 3.5 ohm on the primary. 12vdc to the pin. It's just barely out of spec on the high side of the secondary. I guess that means replace it?

I did change the plugs with no luck. Then I changed the injector, also no improvement. Throwing parts at this thing is expensive. I asked the mechanics at my local dealer if the coils were known to partially fail and create this issue but they were less than encouraging. They did however...

It did cross my mind but the governor/speed control/integration with the hydro drive transaxle is, well, funky. I think it could work, but the throttle control would need to be separated from the hydro - is my guess. Also, I would need to address the fuel delivery/pressure. One thing I would...

The local dealer was super helpful. They even gave me a copy (pdf file) of the shop manual for this machine and confirmed that they are complex little buggers to troubleshoot sometimes. They DO NOT have any type of scanner tool for the ECU and instead, you have to go through the tedious testing...

I finished putting the RTV back together and moved it away from my shop. I may remove the coil and put a multimeter on it but I don't have any specs on it at this point. I still need to verify fuel pressure too. It really seems like an ignition or timing problem and there is a black box, which I...

I don't believe it's a compression issue. 200# on each cylinder again. This time I warmed it up, pulled the plugs, disconnected the injector and coil control wires, held the throttle to the floor, and turned it over a few times. 200# actually seems high to me but it is what it is. I have to...

Well damn! It wasn't the injector. So now I'm wondering what the heck is causing this persistent misfire. It seems like a 50/50 chance it's either the coil or the fuel pump...maybe both, or neither for all I know at this point. I'm guessing that I can check the fuel pressure which admittedly...

i've gotten the engine back together plus flushed the cooling system several times to clean out the combustion pollutants. The engine starts and runs but has a fairly bad miss. I notices immediately that the speed governor was fluttering the throttle body excessively. It idles and drives, enough...

I've got new head bolts and a new head gasket on the way. Anyone know what the factory torque specifications are for the head bolts? I'm guessing 18.9 Nm, or 167 in-lb, or 14 ft-lb?

I'm guessing the 500's have much smaller sales figures than the diesel units based on the availability of 3rd party information alone. I bought this one as a gift for my parents living in upstate NY. Originally had the idea of putting a snow plow on it but I'm rethinking it now. It's much...

Thank you for the information. Interesting design. I have run into a problem with reassembly and it revolves around torquing the head bolts down. The only torque specs I could find online for this engine are 46-50 ft-lbs and I'm guessing that is not correct or even possible. I managed to get a...

well, this site just hosed up a post and then duplicated the previous one. Thats aggravating. Maybe ill try again some other time.

Forgive the slew of posts but I'm trying to get "caught up". I do have one very important question that I hope someone can help me with, but I'll save that for last. Next is ordering parts. I ordered the new head gasket plus any other gaskets I think I'll need, which is all of them. The one...

Finally get the head off and inspect everything. Found that the head gasket had succumbed but everything else looks good. The cylinder walls weren't perfect, they showed some visual signs of discoloration but felt smooth to the touch. Pistons looked good, no wiggle. the crank turned freely, and...