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About Bubblehead

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  • Location Brooklyn, Connecticut, USA

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  1. Bubblehead


  2. Is there a magnet on the outside of the rotor/flywheel that works in conjunction with the pick up coil. Or is it a different type of metal that changes the impedance to have the pickup coil do it's thing? I'd assume that most othe Yamaha's use a similar operation. Thanks, Don't see anything about it in the service manual. Don't see anyway to adjust the gap between the pickup coil and the flywheel.
  3. Thanks again for the quick response Frank: Don't think an;ything in the engine let loose. Definitely nothing in the area of the stator. Checked out Kill switch and cleaned. With in Off have about 1 ohm to ground, in Run OL all the way to the CDI. Never have ripped into the engine, and probably won't until spring., Getting too cold for these old bones. Plugs matched on the 989 and 00 CDIs. Is the thing on the outside of the flywheel/rotor a magnet? If so, maybe the problem doesn't seem to have any magnetism in it.
  4. Thanks again: The stator resistance didn't surprise me at about 1 Ohm (counting the lead resistance of the meter). The voltage at cranking @ 7 v, sure would be higher if running at higher rpm. How do you check the pickup gap? Seems like no adjustment and can't get to it to measure with the cover in place (where the pickup coil is located)
  5. Thanks again Frank: Thought I was capable on checking the coils, but still not working, so NOT sure . lol. You asked about the stator: Assuming you mean the 3 white wires that go to the voltage regulator, measured the resistance between the winding, all within spec. Measured between windings and ground OL ( not shorting out) cranked engine over and got about 7 vac on all three legs (1-2, 2-3 and 1-3) which agreed pretty much as my friends 98 Grizzly. Checked resistance on the source/exciter coil (Brown to Green) 310 Ohms and about 60 vac when cranking engine. On the pulse/pickup coil (red to white) 480 Ohms but only about 0.3 vac. Know this is a pulse voltage so won't be very high, but was about 2 vac on buddy's '98. Obviously checked out the run/stop and the ignition switch to black/white wire on the CDI. With both switched in Run - had OL,, if either in OFF went to about 1 Ohm. Also checked out the ignition coil and within spec both primary and secondary. Changed out spark plug with a new one from NAPA. To best of my knowledge/ability checked out wirings for open/shorts to ground and didn't find any problems. One difference I can't explain the 2000 with turnover with the starter with the CDI disconnected, the '98 will not until hookup the CDI. They have different CDI numbers 5gt-00 but when put the 00 in the 98 with worked, when put the one from the 98 (that worked) into the 00 Nothing. Thanks for all your help.
  6. One other oddity I noticed was that my 00 will crank over with the CDI disconnected, but the 98 would not. The electrical diagram I have says typical 98-01 Grizzly, but obviously something is different ( or have a wiring change on one).
  7. Thanks again Frank: Thought I was capable on the testing also, but still don't have it up and running, , so guess not - lol. You mentioned stator : all three legs were about the same about 1 ohm from 1-2, 1-3 and 2-3 with OL to ground. Puts out about 8 vac while cranking. Source/Exciter coil: Resistance 310 Ohms green-brown and puts out 45 vac while cranking. Pulser/Pickup coil: Resistance 488 Ohms red - white but only puts out 250 mvac while cranking. Ignition Coil: both primary and secondary checked out in spec. Spark Plug: Replaced with new one from NAPA. Ignition Switch and Kill Switch: Checked out good. With both switched in RUN resistance to the CDI black/white was OL, with either switch in OFF resistance around 1 Ohm and will not crank. The only one had a ? on was the output of the Pulser. Know it is a pulse so voltage wouldn't be very high but 250 mvac sounded very low to me. Replaced stator/pulse/source with a Ricky's Stator RS200G8-B but still no spark. Think I checked all the wiring and didn't find any problems. CDIs are very expensive for this atv (for some reason, the 660 were reasonable) so don't want to replace it yet since won't take back electrical parts if installed. A friend has a 98 600 with a different CDI (4WV-F8T34671 vs 5GT-F8T36071) my original ? was are they interchangeable? Connections are the same. Finally decided to take a change. Took the 00 CDI off my ATV and put it on friends 98 and it fired right up. Took his 98 CDI (which worked great on his ATV) and put it on mine - Still no spark. Is that a magnet on the OUTSIDE of the flywheel/rotor? Or does it work by changing the impedance. Magnets on inside to stator are strong, but nothing on the outside thing which I thought was a magnet. That about it, Thanks for any input from you and others.
  8. Frank: Tried the oven trick with no luck. Beginning to think flywheel magnets but the dealership said never so one where magnet went bad. Thanks
  9. Been working on a Grizzly 600 with no spark. Went through the troubleshooting chart and everything checks out within tolerance. Anyone ever heard of the magnet for the pulse coil going bad? Changed out the Pulse coil even though the one in there passed resistance check. Have 44 vrms coming out of the source coil but only 1/2 vrms out of the pulse (at cranking speed). Is that enough to fire the CDI?
  10. Thanks,, sorry about that. Will remember later (hopefully)
  11. Thanks Frank: Yes bike has been sitting for a couple of years in barn. I have never had it running. Bought on CL, guy said need carb work, but have never had spark. Stator, Pick-up and Source coils are were within spec. I'll try the oven suggestion, have nothing to lose.
  12. Have a 2000 Yamaha Grizzly YFM600FWA with no spark. Checked the troubleshooting chart, and all checks were within specs. CDI has part # 5GT-00 F8T36071. Friend has a 1998 Grizzly 600 but his CDI part # is 4WV-00 F8t34671. Are they the same? Thinking about taking my CDI and put it on his ATV and find out if it works, but don't want to damage something if not interchangeable. Thanks
  13. Have a similar problem with my 2000 Yamaha Grizzly 600. Went through troubleshooting guide and everything checked out OK. Last step is replace the CDI, but for some reason they are very expensive compared to the 660s.
  14. Great Thanks, maybe now will be able to find out exact info on quad. Just knew it was a Yamaha Grizzly 600, but not sure of year and looks like some differences.

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