Detonated my WR426 need suggestions
Posted September 15, 2016 - 01:19 PM
Posted September 17, 2016 - 04:54 AM
Loss of compression is not likely related to fuel. Have you actually confirmed low compression with a gage?
Start with the simple and work toward the complex;
- Check the spark plug, make sure it is not loose (also check the plug has the compression gasket).
- Make sure the intake and exhaust are not plugged.
- Check the decompression function to make sure it is not stuck open. (Follow the cable to the front of the engine there is a lever, you should be able to see if move back and forth when you pull the lever on the bars.
- check for spark (remove plug ground against the engine and kick over. Look for a blue spark. If there is none, try with a new plug.
- check fuel in carb
- check jets (pilot and main - simplified, pilot is for idle and main is for 1/2 to full throttle)
This one is a little more difficult. Did you add oil recently? If so, try draining the oil and replacing it (WRs have two drain plugs one on the engine and one on the frame). WRs are dry sump motors and store the oil in the frame, but when they are sitting oil can drain down into the crank case. If the oil level is checked incorrectly you can over fill which could make this problem worse.
From there you need to do compression tests.
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