I’m likely buying a Rok Shifter for this season and have found little information on what carb changes are needed from Rok Cup requirements to safely maximize performance for Road Racing. Of course, the main jet needs to increase, but what about the slide, needle, emulsion tube and other jets? Looking for feedback from road racing a stock engine.
Thanks
Hi Bob
Good to see you on this forum. Good luck with the upcoming season. I’m sure you’re familiar with the base TM settings for road racing, but below is starting guidance (as in, don’t blow up) for anyone running stock with a 30 mm Dellorto here in Australia. Yes, I know you’re looking to run a ROK - can’t help you there.
Tom
Main Jet - 165
Needle - K96 (top or 2nd clip)
Tube - DQ269
Pilot Air Screw - 1.5 turns out
Ignition - 1.1 - 1.2mm btdc (Standard ignition box)
Fuel - Elf race102 mixed at 25:1 with Maxima Castor
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@jsipplracing and I are going to be testing this with his Rok Shifter, as he’s got plans to take it road racing this season. With the stock pipe and stock head configuration, the Rok always runs pretty safely even when on the lean side. Jake has a KZ pipe that we will test, and we expect that to help shift the power band upwards.
As far as jetting goes, needle is the first thing I would change. We will probably test in small increments, going to K28 and then to K23 or K27 depending on results. I could see Tom’s suggestion of K96 working well with the KZ pipe. Slide is already very rich, but richer pilot combo could be needed for road racing.
In short, no clear answer from me, but hopefully more insights after we do some testing this spring. There are some pretty major differences with the Rok port configuration vs a traditional KZ, so that may end up being a limiting factor.
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Evan said it pretty well. I am planning on road racing this year with Dart Kart Club. I bought the Vortex KZ pipe (which you can get from fastech or mondokart. I believe its the RKZ pipe). I believe that pipe is going to get me some more power on the big end.
I know nothing about needle tuning, so Evan will be a big help there. I’m going to follow this thread because I was going to start one similar lol. We will definitely have more insights after testing this spring.
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Thanks for the feedback.
BTW - I’m hearing AKRA will require Rok Shifters to run a stock pipe, airbox, cylinder and head against Hondas in the new class. Basically Rok Cup rules other than inside the carb.
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Oh… thats news to me. Is there documentation to support this? Maybe ill have to run in the KZ class then.
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