I Recently purchased a 1997 zr 580 efi I took it up in the mountains where there was two feet of untuched powder The thing ran great untill there got snow into the hood then It would just bog down, then after I would let it iddle for a while it would run great untill more snow got into my hood my dad said that I need to bypass my throttle, is this correct, if it is could somone help tell me how to go about bypassing the throttle, any help would be much appreciated. Thankyou

Originally posted by deaminus@Nov 16 2004, 02:31 PM
I Recently purchased a 1997 zr 580 efi* I took it up in the mountains where there was two feet of untuched powder The thing ran great untill there got snow into the hood then It would just bog down, then after I would let it iddle for a while it would run great untill more snow got into my hood my dad said that I need to bypass my throttle, is this correct, if it is could somone help tell me how to go about bypassing the throttle, any help would be much appreciated. Thankyou
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What do you mean? (bypassing the throttle) You could have many problems. Is there snow clogging the air box :lmao: or do you have a bad sensor in the efi system. The efi is designed to bog down the engine if it reads a too cold or hot engine temperature. Check to see if snow is getting packed on the engine temp sensor.

Where exactly is the engine temp sensor

Originally posted by deaminus@Nov 16 2004, 03:12 PM
Where exactly is the engine temp sensor
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Best thing to do is to get a manual. I think what your dad meant by bypassing the throttle is that the throttle cable may be icing up and sticking which would cause your throttle monitor switch to activate once the loose on the cable hits the switch. I don't have my book with me, but you can bypass the throttle switch by taking a paper clip or wire (preferable) and closing the circuit on the connector on the throttle monitor wire.... this should tell you if it's the monitor switch... only Cat has those... if the problem persists, then it's probably shorting out somewhere... I found the manual really helps... you would be able to test all your sensors as they have the resistance specs etc.

They say if you own a Cat, always carry a piece of wire with you...

On the '97 all you do to bypass the throttle override is unplug the 3 wire plug along the steering column, just under the handlebars. The thing is, the system is working correctly. When snow gets in the carbs., or throttle bodies, it can freeze. That sets off the throttle override system. Bypassing it isn't gonna make the snow stop from getting in there. (your real problem). Address how the snow is getting into the airbox and you should be fine. sometimes its as easy as making sure the factory screen is properly positioned over the airbox intake.

If it is bogging when snow gets under the hood then I would say it has nothing to do with the throttle safety switch. If the washers on the throttle pivot pin are shot, which is the typical cause of the infamous " Cat throttle safety switch problem", then the sled will misfire, which is quite different from bogging.

When snow gets under the hood it can cause a number of problems. it can cause the fuel delivery system, EFI injectors or carbs, to freeze up, water can get in around the intake flanges and air box, snow on the clutches will make the sled bog, but not he motor, water can get into the electrical connectors. The easiest thing to do is to prevent the snow from getting under the hood. Use some duct tape and block the holes to see if makes a difference. If the sled works fine with the hood vents blocked off then you know what the problem is. Now you can get a screen kit, or a a vinyl bra that covers the vents and just snaps on and off as you need it.

Sounds like you need a screen kit, I have one on my 97 and I had no problems of that sort and I played in snow alot deeper than that last season.

I by passed my throttle and it helped some and My engine tempereture sensore is on and working correctly It runs great most of the time but on acasion still when that snow gets in it bogs down again and I have to shut it off and let it sit for a few minutes then start it up and it runs fine again I am goin to tape it up this thursday when I go and see if that helps, If there is any more ideas I Would greatly appreciate them, I also have a question about my secondary clutch it is an affter market one and on the side of it it has three things you can turn then a middle piece will turn every I ride with have never seen these, does anyone know what it is used for Thank you

post a pic on what your describing if you can cause I think you lost the most of us in what you described.

I think he's describing the internal helix secondary that came on that sled. It is for adjusting the width for belt wear. You unlock the tree tabs and rotate. this will widen or narrow the secondary to the proper width for the belt. It only came on that sled for 97. Then Cat went to the roller.

AAAAAAAAAAAAAhhhhhhhhhhhhhh, IC. mine was switched to the rollers before I bought it, thats why I was lost in what he was describing.......... :bash:

Come on man, get with the program... we had this discussion!! LOL

I find you can get a longer belt live as adjusting it is easier then shimming. BUT, that being said, still like the roller better and that's why I am switching mine out for a newer style!

Sorry Greg, Just turned 24 so I guess it was a senior moment! :christmas: