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View Full Version : Apex 90 Mid to high rpm miss



pdshooter
01-19-2009, 12:55 PM
Have a new '08 Apex 90 with the break-in precedure and one race on it. After the race my son has spent about 5 min. on it. It was running great when we parked it. Started it yesterday and it runs real bad on the upper 2/3 throttle. Real crip and responsive on the lower 1/3. Have had the carb apart twice and am confident it is not the problem. Eliminated the shut off valve and filter temporarily. Of course changed plugs. Like I say it was running great when we shut it off. The only thing I did after that was eliminate the kill switch. Need help on where to best spend my money and efforts from here. Thanks. Scott

crzy8racin
01-19-2009, 09:10 PM
Do you have a chassis ground on it? Mine was doing same thing.

pdshooter
01-20-2009, 07:27 AM
Thank you for the reply. Last night I fixed the problem by putting a 3rd spark plug in it. I think I'm going to replace the coil in case by taking he plug wire on and off I fixed a bad connection in the wire.

SMS
01-23-2009, 06:38 PM
I have had a lot of problem with the ignition coils going bad. I recomend changing them before it leaves you stranded.

pdshooter
01-24-2009, 10:29 AM
Thanks, I have a new coil on the way. The latest problem is the A-arms are starting to bend. I'll be reinforcing them this afternoon.
Thanks for your help............looks like I'll need more.

SMS
01-24-2009, 11:14 AM
www.snydermotorsports.net is ome pics of ours

pdshooter
01-24-2009, 11:32 AM
They look much better. Ours is an '08 standard travel. How much for your A-arms? So much for buying a race ready quad for $3000.00! I told my son he's going to have to find some sponsors.