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Discussion Starter #1
Hello all, I am new to the forum it look like i will be spending a lot of time here! I have a 98 zr 600 batteryless efi and it seems to start hard, about 5 HARD pulls at least if its cold. any advice or things i sould know in genaral about this sled its new to me this year cant what to ride??? thanx Bill
 

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This is from another post on the board and it might be the answer that you are looking for. Sometimes the fuel pressure can really throw things off as far as starting and idle go. Another possible problem is dirty injectors. Hope this helps and welcome to the site. Dan


QUOTE: Hey Maverick, First sorry it took so long to get back to ya, had a problem with getting the reeds in the first place, then I had to do some testing so I could both help myself and you out. Ok here goes...I first got the reeds and put them in, same story as you...idled low and just didn't seem right, I check this and that, that and this, nothing made sence. So I was figuring the only adjustability that you could possibly have on an EFI sled is fuel pressure, not to mention I've heard that the fuel pressure regulators on these sleds were doggy poop because they set them at factory to be extremely high and you can't adjust them. So I ventured to buy a fuel pressure regulator with a guage and put that on.....well let me tell ya...HOLY CRAP!! the sled now runs 2000 times better than it has since I bought it, I have a perma-grin, she moves now like she never did before!!!!! It's just unbelieveable at how much of a difference it makes, it starts on the 2nd pull every time, it's wicked snappy now and just wants to rip!!! Ok enough of that, I'm currently running 38 psi. but I've heard 36.2 is the optimum for the most sack, I just don't want to push it until I'm comfortable...You have to get one!!! It WILL!! solve you problems!!! I did a little test and pushed the fuel pressure up to about 43 psi and the sled dogged down to about 750 rpm at idle and was acting strange just like it was before I got the regulator so it pretty much seems cut and dry to me.....

Well, I hope this helps, and I do highly recomend everyone with an EFI should get a fuel pressure regulator because with the simple turn of an allen wrench you can adjust your......"jetting".....and add any mods to your sled..... : Quote
 

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like all my other parts replies, start off checking ebay, great prices when you find what you need, other than that check snowmobile salvage yards, they always have good stuff laying around too. If worse comes to worse, call your local dealer.
 

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Checking ebay is an extremely good source for repair parts. I would suggest that you purchase and aftermarket regulator, then you could adjust the pressure yourself. I would strongly suggest for you to put a pressure gauge on the fuel system first and see what the numbers say before anything else. Dan
 

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Discussion Starter #6
I will try yo get ahold of a gauge and check the current press. do you know how the batteryless fuel pump work?
 
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