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In March when I summerized sleds I noticed my wife's 2016 600 Rush Pro S had what I thought to be a lean reading plug on the pto side of the engine. Not white but substantially lighter than the mag side. Can someone suggest a flow sheet on things to check. This sled has about 2,000 miles on it and runs great. It still had the original plugs. I changed them out but am thinking I ought to investigate this further before next winter. I have seen past articles on injectors getting plugged as one possiblity but need to hear from you the experts.
 

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In March when I summerized sleds I noticed my wife's 2016 600 Rush Pro S had what I thought to be a lean reading plug on the pto side of the engine. Not white but substantially lighter than the mag side. Can someone suggest a flow sheet on things to check. This sled has about 2,000 miles on it and runs great. It still had the original plugs. I changed them out but am thinking I ought to investigate this further before next winter. I have seen past articles on injectors getting plugged as one possiblity but need to hear from you the experts.
I'd use a laser heat gun to read the exhaust temps right at the exhaust y-pipe on the outside at each cylinder exit.
Also perform a compression and leakdown check on each cylinder.
If it shows one cylinder is significantly colder (richer) or a lean condition (hotter), or low compression, this could be the reason one plug reads leaner.
To clean injectors, add some Techron fuel injector cleaner to the fuel tank and run it. Then recheck exhaust temps and plugs. https://www.chevronlubricants.com/en_us/home/products/techron-fuel-injector-cleaner.html?gclid=CjwKCAjw_qb3BRAVEiwAvwq6VooYYFL9YkyKE8Y7R477DS4IXL5kToofL48vP3ut_nrWndHVTuG9wRoCT5MQAvD_BwE&mkwid=s4YkzwrlA_318249616958_techron fuel injector cleaner_e_c&mtid=744bv356395&slid=&product_id=
Other causes can be air leaks at the throttle bodies or crank seals. Spray some starting fluid around those areas when running to see if it affects idle rpm.
 

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I am redoing my '15 800 now. 6,700 miles, ran great last season. Doing new top end, so decided to do filter sock and pull the injectors for cleaning. They were sent out to a specialist. They informed us that one injector was at 50%, the other was 80%. I rarely have the thing pinned, and if so, maybe for five seconds. Terrain is more corner to corner. Anyhow, was surprised to learn of the blockage in the injectors and am glad we can remedy before the sled became a hot mess on the trails. YMMV.
 

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Discussion Starter #7
I am redoing my '15 800 now. 6,700 miles, ran great last season. Doing new top end, so decided to do filter sock and pull the injectors for cleaning. They were sent out to a specialist. They informed us that one injector was at 50%, the other was 80%. I rarely have the thing pinned, and if so, maybe for five seconds. Terrain is more corner to corner. Anyhow, was surprised to learn of the blockage in the injectors and am glad we can remedy before the sled became a hot mess on the trails. YMMV.
Thanks for that. This sled rarely gets pinned as well. I am going to have the injectors evaluated so I have data to determine if I have found the problem.
 

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k100, red line fuel system cleaner, and klotz octane boost all work very well at cleaning injectors. just sent out injectors from a 2017 sled. k100 used at just about every fueling. the injectors were perfectly clean. no improvement once cleaned in both spray pattern and flow rate. 5000 miles on the sled. we see this with all the above mentioned products. just for some info.
 

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An informative video on cleaning/checking fuel injectors:
That was a very helpful video. We are going to run into more injector problems, as fuel quality goes down. Routine preventative use of a GOOD fuel system/injector cleaner additive will help avoid these problems, as well as spring stabilizing and/or fall replacing of fuel in the tank, especially if it has ethanol in it.
 
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