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Hemholtz Retro?

"Dear Ralph" November 28, 1999 0
Dear Ralph: I read in SnowTech Magazine that the Cat 500, 600 & 700 will have Hemholtz resonators on them this year. I own...

Dear Ralph:
I read in SnowTech Magazine that the Cat 500, 600 & 700 will have Hemholtz resonators on them this year. I own a ’98 ZL 500 which is a great sled with the exception of the noise levels. I have tried to get a fix but have had no luck. Do you think the system on the 2000s would retrofit onto my sled? Do you know wether the resonator is on the exhaust pipe or exhaust canister? Would both have to be purchased? Any other changes that would have to be made?
Peter Young

The Hemholtz resonator that Arctic Cat is refering to, which little information was available in the Spring, turns out to be an airbox change that was made to many of the ’99 600s. The internal dimensions and ports of the airbox are altered to “trap” the primary firing frequency of the engine, resulting in a quieter intake noise level. This modification is now being adapted to a large number of 2000 Cat models, and you should be able to add this to your ’98 500. I don’t believe you can get the internal airbox components seperately, so you’ll likely have to order a new airbox. It would be wise to emulate the carb jetting specs of the 2000 model 500 engine to compenstae for any airflow changes, and then make final calibration adjustments from that point.

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