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Discussion Starter · #1 ·
Guys I have a 2000 M/C Tcat that Im trying to get on the snow. original motor and carbs are gone so I picked up a crashed 99 , I thought I could just use the CDI from the 99 and go but it would not start on the 99 cdi so I plugged in the 2000 cdi and it started right up. ( TPS not plugged due to having round slides vs the flat w the tps) So that was the end of my day sunday so now Im wondering do I need to switch out my wiring harness to the 99 ?
 

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I put an 2001 CDI on my 2000 T-cat and added a 4* key in the flywheel. I do run premium fuel. If I only had put a 2* I would not think twice about running 87 pump gas. The 01 has 4 1/2* more timing than the 2000. The 2000 was only 9*. That would be far easier than switching the wiring.



Here is what I found in searching:


No mysteries. The 1998-1999 usues the CU2545. It is an open loop CDI. The 1993 was a one year wonder and is a closed loop CDI box. The 2001 is an open loop 3d ignition that uses the TPS (Throttle position switch) to choose it's 3d map for the ignition timing. Each CDI works well. Each one pretty much has the same top end timing advance. The 2000-2002 ignitions are totally different and you can't mix and match parts from a 1993-1999 ignition with a 2000-2002 ignition. The CDI box, stator, flywheel, flywheel mounting plate are different. The only things that are the same are the trigger and the coils. Depending on the mods you have done to your sled determines which cdi may work best for your application. Some guys add timing keys ect...but depending on your porting, pipes and head combo your sled may want or may not want more timing. I've seen some very interesting results on the dyno verifying everything I wrote above. If you have a stock 1999 sled, just use the 1999 cdi on it. You won't have any issues with it. The only "bad" thing I've seen on the 1998-1999 CU2545 cdi box is that they are more apt to lose the grounding circuit in them. That means that when you turn the key off or hit the kill switch, the sled doesn't shut off. The "updated" 1998-1999 ZRT box# was the CU2542 and most guys didn't like that box. The 2000 CDI was a dud...9 degrees timing on the top end. That was box# CU7211. The 01' was the "best" CDI box for the 3d ignitions produced between 2000-2002. The 2001 Pt. # on the box is CU7208. The 2002 CDI box was somewhere in the middle of the 2000-2002 box as far as the timing advance.
 

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Discussion Starter · #3 ·
Thanks for the info. I’m going to switch out the main wire harness to the 99.
I know the 00 box is 9*
I have 99 and 93 CDi.
 

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Discussion Starter · #4 ·
Thanks again for the info, all this time and just realized bc of your part # you posted I have a 01 3D cdi. But no flat slides
 

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everybody praised for the 93 cdi...in fact they had only 1 degree difference between a 93 cdi compare to a 94/97....98/99 are open 2545cu..... 2000 compare to 01/02 you have to put a 4 degree key to be even....
 

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I might be wrong but the 93 Cdi had a much better timing curve, not that the overall timing was all that much more.
 

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Guys I have a 2000 M/C Tcat that Im trying to get on the snow. original motor and carbs are gone so I picked up a crashed 99 , I thought I could just use the CDI from the 99 and go but it would not start on the 99 cdi so I plugged in the 2000 cdi and it started right up. ( TPS not plugged due to having round slides vs the flat w the tps) So that was the end of my day sunday so now Im wondering do I need to switch out my wiring harness to the 99 ?
Don't need to switch out wiring harness. I put out 2 youtube videos showing the difference between 91-99 and 2000-2002 ignitions. Essentially the stator mounting plate, stator, CDI and flywheel are different. Using the 2000 ignition on a stock motor is fine. The more you mod, the more the 93 cdi can help but you have to swap out the stator, stator mounting plate, flywheel ect..
 

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Discussion Starter · #10 ·
Thanks ,
I switched out the wiring harness so basically Its a 99 now.
I do have a 93 CDI and if I try it out the key and kill switch will work backwards , right?
 
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