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Post by rupps4fr on Dec 14, 2014 20:51:57 GMT -6
Folks. After several years of storage, I decided to resurrect my 74 Nitro ii and my 75 Nitro. Fortunately when I put them in storage ( always inside an enclosed trailer), I removed the seats which I stored inside the house and drained the fuel from the carbs. I recently replaced all the fuel lines and tore down all the carbs to make sure all was good to go. I manually filled the fuel pumps and the carbs and with a few pulls for each, both motors fired up and ran nicely. However the 74 took a ton of arm power to pull the rope. After it ran for a few minutes, I shut it down and started it up and again it was very hard to pull. I pulled the plugs and pulled the rope and it pulled normally, ie no apparent mechanical issues. Looking down the spark plug holes, the amount of carbon on the tops of the pistons appears normal. I know after 10 plus years my right arm has lost some strength but not that much. The motor acts like it has too much compression. Planning to pull the heads and maybe the cylinders to check carbon build up in the heads, gasket thickness, etc. All suggestions appreciated.
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Post by Johnny Speed on Dec 14, 2014 21:11:08 GMT -6
Oil or fuel in the crank case will cause huge compression , ski-doo RV's center seals leak oil into crankcase when bad, had this happen
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Post by rupps4fr on Dec 14, 2014 21:55:26 GMT -6
Thanks for responding. When I put the sleds into storage I did pour some snowmobile oil into each spark plug hole to prevent corrosion. Maybe I went too far and there is too much in the crank case. Hows does one get the oil out of the crankcase?
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Post by Johnny Speed on Dec 14, 2014 23:07:24 GMT -6
Some engines have removeable plugs in the lower front, or take the spark plugs out and slowly turn the motor upside down towards the mag or pto ends so oil passes from case to cylinder through intake port , if you can start it and it runs without a hammering noise you should be able to run it a while and it will wash the oil out with the fuel passing through the crankcase, did it sound okay when you Ran it?
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Post by drrupp on Dec 15, 2014 6:54:46 GMT -6
Check exhaust for mouse nest it could be plugged.
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Post by rupps4fr on Dec 15, 2014 7:15:51 GMT -6
Thanks for the help guys. I will check the exhaust. There was was some hammering noise so hopefully I can find crankcase plugs. If not, out comes the wrenches.
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Post by rupps4fr on Dec 15, 2014 8:45:27 GMT -6
Guys, No drain plugs so the engine will be pulled from the sled and rolled to get the oil out through the intakes. Your thoughts as to pouring some mixed gas and oil into the crankcase to dilute the oil which should help get it to drain out. Sure glad I hopped on to this site. Many thanks to all involved.
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Post by rupps4fr on Dec 18, 2014 15:40:48 GMT -6
So I started preparing to pull the engine from the sled and I found crankcase drain plugs on the intake side of crankcase. Pulled the plugs and tilted the engine and nothing came out. I checked the exhaust system for restrictions and found none. I cranked the engine by rolling the clutch both with the spark plugs in and with the spark plugs out which felt normal. Then it hit me, let's look at the recoil system, only 4 bolts and it's off. The recoil pulley was in 2 pieces and engagement pieces broken loose. When I was pulling the rope the pulley was spreading and rubbing on the inside of the housing. Fortunately I didn't take the motor out or disassemble it. Again thanks for the guidance.
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Post by Johnny Speed on Dec 18, 2014 16:34:01 GMT -6
That's great you found it, Rick in stewartville has new rewinds for kohlers
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Post by ruppluver on Dec 18, 2014 18:47:33 GMT -6
Rupps4fr,PM sent about recoil.
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Post by snosnake on Dec 18, 2014 18:56:53 GMT -6
I have a pile of NOS parts for the Kohler AX,AS,RS & RLC recoil...
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