First ride of the season. New Performance Issues

[E Zurcher]

A coworker and I took some leave from work on Thursday and went form Abq to Santa Fe via Highway 14, The Turquoise Trail. Experienced the same issues as some others have posted in the past. Bike feels okay at low RPMs but once she hits around 7000 it starts to miss and won't even get past nine if held open. Funny thing is when you roll on slow it only misses a little. Tried some roll ons in higher gears and when I roll off the throttle it actually pulls a little harder for a second. Been using techron and have two tanks through to no avail.

I will check the following this weekend.

Plugs tight
Injectors clogged
Fuel Rate IAW Manual
Try to backflush the fuel filter again

Anyone know of a cheap fuel pressure gauge that'll work on a Gen 2?

 

[fizzer]

if its been stood in your garage over the colder weather try some fuel injection cleaner in the tank mate,then thrash the tits off it ,it may clear itself,if not well you have had some fun

 

[k8BlueGoldBusa]

A coworker and I took some leave from work on Thursday and went form Abq to Santa Fe via Highway 14, The Turquoise Trail. Experienced the same issues as some others have posted in the past. Bike feels okay at low RPMs but once she hits around 7000 it starts to miss and won't even get past nine if held open. Funny thing is when you roll on slow it only misses a little. Tried some roll ons in higher gears and when I roll off the throttle it actually pulls a little harder for a second. Been using techron and have two tanks through to no avail.

I will check the following this weekend.

Plugs tight
Injectors clogged
Fuel Rate IAW Manual
Try to backflush the fuel filter again

Anyone know of a cheap fuel pressure gauge that'll work on a Gen 2?

I never get gas at chevron always the most expensive and I think its one of the dirtiest gases. I know all kinds of problems from people getting their gas. Im good with maverick never had one problem or anybody I know either has.

 

[lankeeyankee]

If you have bad gas which I am saying this is the problem I would suggest emptying the tank completly.
This is a known problem even more so with ethanol in the fuel.

If you are to lazy to drain the fuel completly I would suggest some dry gas, or 99% isoprohlyn with some paitence. Next year I would suggest filling the tank to the top till the last drop complety with a non ethanol fuel

 

[E Zurcher]

Got it figured out. Last summer I got some bad gas in Colorado and my fuel pump started whining. I removed the filter and backflushed the pump with carb cleaner. When I put it back together the whining stopped for a short time and came back but performance was OK. Hard to tell on a bike with so much power to begin with. Over the summer performance dropped off slightly but not enough to be of too much concern. She would still run clean up to redline. Tried Seafoam for a couple of tanks and that's when I noticed she started missing above 9000 rpm. Switched to Techron and it got worse. Funny thing was if I rolled on the throttle slowly she awould attain a higher RPM but when I held her wide open she would just miss and not go over around 7K. Also When I rolled off the throttle it would actually gain power for a second. This made me 99 percent sure the problem was fuel pressure.

Checked all the usual suspects and no change. Removed the pump and disassembled. I used my fuel bottle for my RC trucks. It has a screw on top with a 1/4 inch metal pipe. Placed it in the outlet of the filter and backflushed the filter with high pressure and volume. Gas came out murky and dirty. Put about a quart of clean gas through it this way and the flow got noticeably better as I went.

First test ride and she went straight to redline and nearly pulled my arms out of the sockets. Fuel pump whine went away. Time will tell if it's a permanent fix. If not I know it's the filter for sure. I'm a happy camper.

If I took it to a dealer I was probably looking at about 500 to 1000 bucks depending on their honesty.

Take note of these symptoms. If you have the same, go to your local hobby store and get a Quick Fill Fuel bottle intended for nitro RC cars and trucks. Backflush that filter, a new one costs around $250.00 It can save you some big bucks. I may do this at the start of every season.

I had intended to remove the fuel rail and clean the injectors. Problem was I couldn't get the four screws that hold it in place to budge. I tried it with a cold and warm engine. I am reluctant to use an impact driver because of the way the throttle bodies are mounted and the fact the fuel rail mounts are plastic and I don't want to break them. Any ideas?