2003 polaris sportsman 700 knocking issues
#1
2003 polaris sportsman 700 knocking issues
I recently took my engine apart in my 03 polaris sportsman 700 because it had been sitting for 2 years and needed to be cleaned out. When I took the engine apart, I forgot to mark the timing gears so I lined up the factory timing marks. When I first cranked the engine over it started but I could hear a knocking noise coming from the engine, as if the timing wasn't right. The engine soon died and now all the engine will do is crank over, but will not start. I can't figure out where to start with the knocking issue, or what could be causing it. Any insight would be greatly appreciated.
#2
Compression check first. If the cam gear,counter balancer and crank sprocket weren't timed right bent valves could be the result. Knocking could be anything,if the double cam sprocket came apart and jumped a tooth,this could be the source,but I'd be mighty suspicious of a bad rod bearing also just from my experience with them.
#3
#4
Crankshaft is a complete unit on the 700 and parts not offered by Polaris. Can get expensive if it is a rod.Dirt Cheap Yamaha, Honda, Arctic Cat & Polaris OEM Parts & Accessories – Cycle Parts Warehouse
#5
#6
Possible,but you need to measure the cam shaft journal OD and the case bore ID to make sure. If you have as manual it's under engine specs,if you don't here's a cheap 5 buck pdf service manual.2003 Polaris Sportsman 700 Service Manual PDF Download
#7
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#9
#10
Last thing I'd trust is a used crank shaft on 700 or 800 twin! If the atv is worth repairing,that is everything else is in decent shape,I'd repair it right. I will warn you though there is a lot of posts on Ducati ignitions failing eventually on this model also. Just search ignition problems on 2002 to early 2004 Sportsman 600 and 700 models on this or other forums or just do a Google search. If it does fail,it's another $500 for the kit,on top of the engine repair.