Hey Guys I have a 93 900RR. It's got 2mm over pistons and stock cams with a ported head. Also has a jet kit. I was told about 150 jets in the carbs. Also running a 2 bros header with just a dump on it. Recently it has become hard to start. Also a couple times I have turned it off after riding and go to start it back up about 5-10 mins later and it wouldnt start. Just cranked without a sign of it trying to start. What do you guys think it is?

Oh and what is the proper way to turn it off? I always used the kill switch but my buddy told me the other day I should use the key? Is there a difference?

 

There is no difference, the kill switch or the ignition both cut the curcuit. I found that after I put a jet kit on my 900 I didn't need to use the choke anymore and it is more sensetive to starting it. I have to start it with no throtle. Johnny

 

Hmm Ok. Also If I start it up in the morning with it choked it does like to pop and shoot a little flame out the pipe with it choked...

 

Got a few ?s about this dumped exhaust;

Does it have any sort of baffle?
How much louder than an aftermarket pipe is it?
Was the engine tuned (jets and such) with this dumped setup?

If it's popping and shooting flames out with the choke on, try it without the choke. Sounds like it's getting too much fuel exiting your exhaust ports, igniting on the headers rather than in the cylinder.

That could possibly be the problem trying to restart; too much fuel left in (flooded). I'm no expert mechanic, but I'd check to see how rich you're running.

 

Straight header with a tip dumping it so no baffle at all. So yes Very loud. I am in the process of switching over to a full Micron system, also I found a couple burnt gaskets so that may have been leading to mypopping also. As far as I know it was tuned with the dumped exhaust on it. And yes it does settle the popping down with the choke off and it also pops when I let off of the throttle. My plan is to throw some new plugs in it (cheap Insurance) get the new exhaust on and see how it does. Then if there's still a problem take it for a dyno tune again with the new exhaust

 

If it's popping with the choke on and when you let off the throttle then you're definatly running rich.

Got any pix of this exhaust???

 

Ya you can see it in the lower part of this picture

 

Awesome... how about some more pix of the bike. That paint job looks great!

 

Ya its a pretty nice bike haha. Ok new problem though..Put the full Micron on and now it only idles around 1000 with the choke on, drops down and dies with the choke off and with the choke on if I try to crack the throttle it falls on its face, it needs a slow hit of the gas. Rejetting needed, I'm guessing it needs to drop a little fuel off the table to get it to go right?

 

This picture's pretty cool