[Luis Soto]

How much for just the GPS (no data key)?

Thanks,

L.S.

[Luis Soto]

Nothing apparently related to electronics, but we had a nasty throttle response issue with our Junior upgraded engine (as per my previous post). Maxspeed was kind enough to send me a new carb and sure enough, as soon as we swapped carbs, the issue was gone immediately. No other changes made, and Maxspeed is taking the defective piece as a warranty return. So something else to consider.

What’s more, the famous ground wire is not even connected to where it’s supposed to (top of cylinder head). Driver coach/mechanic doesn’t seem convinced this ever had an effect on anything (because there doesn’t seem to be any popping, etc. now)…

Luis

[Luis Soto]

I’m obviously no expert, so I apologize beforehand if my suggestion reflects that, but we had a very evil throttle response issue on a Junior with the Evo kit. Swapping to a different Evo carb fixed it, after fiddling with settings to no end. So you might not want to rule out that possibility and swap to a different carb (if you have access to it) just to see. Maxspeed accepted the bad carb as a warranty return.

Luis

[Luis Soto]

I thought I’d give an update on this issue…it was all down to a defective carburetor. Maxspeed was kind enough to send us a replacement – as soon as we made the switch the issue was gone immediately. No other settings/changes were made. The old one will be a waranty return.

Thanks to all who read this and in particular those who provided suggestions!

Luis

[Luis Soto]

We are seeing a similar issue on my son’s Junior Rotax: There’s a huge delay, or lag between throttle application and engine response. If you basically “stand on it,” there’s almost a full second delay before the engine responds. Coming out of the corners, my son says he has to “roll” onto the throttle much more than before the upgrade, and then there’s “a lot of popping” 3/4 down the main straight at his home track – like he’s topping out. This is not how I understand the Evo is supposed to work (?). We have tried with the supplied 130 jet, 128, 122, 125 and 118, which is what’s in the carb now. His coach/mechanic is sure he grounded the wire in question as per the instructions. I thought the problem might be a faulty ignition coil, but some people I’ve talked to say it’s carburation. Any thoughts?
Thanks in advance…

[Luis Soto]

Also interested, and also wanted to ask if they’re magnesium or Aluminum.
How much to ship to US Zip Code 07305?

Thanks,

Luis

[Luis Soto]

Hi, Lou

Yes, this is still for sale.

I’ll text you at this number, and also send you a PM.

Thanks,

Luis

[Luis Soto]

Hi Christian!

We haven’t – so that’s one of the things we’ll “put on the table” when we go testing it again on Saturday (will you guys be there?). I remember you telling me about Aidan’s issue, but did not make the connection, that it might be similar to ours. Thanks so much for the info and see you there soon.

Luis

[Luis Soto]

Thanks for the response!
We’ll be back in a week to test again – my son has plenty of experience with the “prevo” Rotax throttle, but to be honest, the amount of rolling the throttle he is doing is ridiculous: way, way more than before the kit. After what you wrote, I’m of a mind to start again with 130-125 jet and go from there. Our coach/mechanic also changed the needle position in the carb, to chase the lag. I’ve also been trying to get a hold of another carburetor, to be able to rule that out.

Maxspeed did suggest to check the battery amps and voltage – to try that first before the carb. I’m obviously not an engine tuner, but the three reputable ones that I’ve talked to seem convinced it’s a carburation issue. I’m challenged that we don’t have access to the kart until the testing day, so pretty much we only have that one day to sort it out before the next race…:S

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