I purchased an 02 F4i about a month ago, needs some work. It always started up fine, and ran good. I decided to cut down the pipe and make it a shorty since it had a dent in it from first owner laying it down.
After I cut the pipe down and re installed it, the bike started, ran very rough for about 10 seconds, then died and I have not been able to start it since.
I don't think me cuttin the pipe down is related to this but not sure.
The red light to the left of the neutral light stays on, the bike turns over and every couple turns it sounds like its going to fire up but doesnt.
Oil light blinks but I think it always did until it was started.
I'm startin to go crazy here, any one know what to look for?

check your oil

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hi ho CBR awaaaaayyy



2004 Cbr600rr Race Bike
2001 929rr FOR SALE
2005 CBR600F4i wifes bike
1970 Titan T500 first bike, frame up resto

Oil levels good

ok so its a simply easy one to try but you arent trying to start it in gear with the kickstand down are you and the run switch is on and you do have gas in it?

sometimes we overlook the simple things

im trying it in neutral, gas in the tank.
today when i tried it the red light was out. it sounded like it was gonna fire once but no go.
white puffs come out of the exhaust when it sounds like its gonna start.
other than that when i just turn it just turns over.

pull your plugs and take a look a them to see what they look like. sounds like you have some fouled plugs. if they are black you are to running rich and if they are white you are running to lean. could also be just time to change the plugs.

is it getting fuel???

u burnt your valves or burnt a hole in the tops or the pistons and u arent gitting any compression

I would say that its not you that burnt the valves, tho, cutting down the exhaust does have some detrimental long term effects, and could burn a valve, I doubt this is the case here. How many miles on the bike? I tend to agree with the plug statement, that they may need to be changed.

The loss of back pressure from cutting down the pipe really isn't good for alot of things, to wit, fuel mixture tends to richen with less back pressure, and, you lose torque from that lost back pressure as well.

On a bike, unlike a car, shortening the exhaust and lowering back pressure are bad things for a fuel injected engine without changing the fuel air mixture, thats why many of us put power commanders on our bikes, you need to when you change the exhaust.

To check to see if you've put a hole in a piston, get a compression checker, and see if all the cylinders are withing a pound or two. Its worth buying or renting the compression checker, because it will stop you from doing alot of other stuff and wasting time and money trying to fix something, that may not be worth fixing.

Make sure you have a very good charge on the battery when you attempt starting it, low charge on the battery can turn the bike over, but may not have enough voltage left to really push the coils well. These are all guesses, and all are predicated on the exhaust being cut, or the bike sitting for a long time.

Personally, I"d check fuel pressure coming from the pump, check any filters that are in the fuel line, check the battery, check the plugs, and see if you can find the culprit among those. definitely an odd happening.

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2000 CBR929RR- Cams, Micron cf pipe and headers, Power commander 3 (custom mapped), heads, decked, ported, polished, zero gravity shield, Frame sliders, polished frame and swingarm, remote controlled red neons, Stainless Braided front and rear brake lines. RK 520 race chain and -1/0 Vortex sprockets, bitch pegs and rear seat removed, OEM rear seat cowl, Pirelli Diablo Rubber.

ya im not sold on a valve being burnt. as it was running prior and you only had it running for 10 sec. with the new exhaust. i am guess the new exhaust really messed up your air to gas mixture and you fouled the plugs. but thats just me