Re: Still at the 460

Posted by lee on August 07, 2004 at 08:56:09 from (24.24.95.246):

In Reply to: Still at the 460 posted by Kelly C on August 06, 2004 at 20:24:55:

Oh the frustration of internet trouble shooting. Here is another thing you can try. I keep throwing things out in hope you can blunder onto the problem. Mark the currrent position of the distributor in some fashion. Loosen the distributor clamp just enough so you can turn the body of the distributor. Start the tractor and warm up a little. Idling very slowly, turn the body of the distributor one way til it just stumbles and back til it stumbles. Find the sweet spot in between where it seems to run best
Take note if this is any where close to your original position. Check the timing marks with your timing light. Now try to raise the RPM.
See if it does the same thing as before. If it does, raise the RPM and adjust the distributor again til it's running best. See if it will now take the throttle. Find the spot it seems to run best and note if it is anywhere near your orignal position. Note- If you check the timing marks with your timing light at high idle they should indicate an advanced timing as the mechanical advance has come in, not sure how much advance is in the distributor, MAKE SURE THE ADVANCE IS COMING IN. I am not advocating timing the machine this way, just toying with it as diagnosis. If you get an improvement in the running, mark the spot in some fashion. Now go back and time the motor per the manual. Check this spot against the original spot and the spot you found running. There are several things you can learn from this testing. You may find you did have the ignition timing set correctly. That you cannot effect an improvement from the original position. This would indicate ignition timing is not the problem. Or maybe you find it was not timed correctly. If you find it runs best in a position other than that set by standard timing method we have more work to do to find out why standard timing is not working. Beyond ignition timing the only open item in your ignition is the coil. Beyond that you have the valve train and cam timing and verifying all is in order there. You do have good compression which seems to indicate it's OK. You can still have a worn cam or wrong cam timing and get good compression. Even though you have a new carb there is an unknown with the jetting. I do hope you have some success today. Keep plugging. You will get there.

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