[slarson]

Hello Guys,

Please help me if you can, I have a 98 FIII 600 with 4000 miles on it.I did my first 100 miles today, fairly hardpacked condition, about 18 degrees Farenheit, about 300-500 feet above sea level. I have 280 Main Jets in all 3 cylinders (290 is stock) and The TRA clickers are now on position 5 (4 is stock). Plugs look good in color (still slightly rich, dark brown color after 1/4 mile run a w.o.t.). The problem I have is when I hammer the throttle to wide open, it only goes up to about 7500 rpm, and the slowly reaches 8000 and goes no more. The max rpm setting according to my Doo factory manual says it should rev to 8500rpm. I was under the impression, when I hammer the throttle it should shoot up to 8500 rpm, and pretty much stay there. My raves are clean, carbs are clean, new OEM belt, all new bearings in sled pretty much including the one behind the secondary, clutches are aligned, clutches are clean and all stock (done this fall),  new plugs....etc.... I suspect that my primary spring is weak, does this sound logical, or is it in the secondary?.....when I first got the sled, it would go over 8000rpm and go approximately 105 mph in good conditions (speedo) and now it only goes about 90 mph at 78-7900 rpm......any other suggestions, as this is my first clutching diagnosis and repair job. I do have the proper tools to do it if it is the spring, just want to make sure my theory is sound.......any other suggestions???

Thanks in advance folks......Ride on!!

 

[slarson]

Yes KR,

It is going up to about 75-7600 and then slowly reaching only about 8000 max, deflection is good as per factory manual, according to my manual clicker 4 is factory, I plan on trying the Primary Spring first, and then the Secondary, it has not been done in the 3000 miles I have owned the sled. I do not suspect the stator, there is no misfire at all, and all of my accesories work good, my lights are even bright at 2000 rpm, and I checked the voltage and it is in spec by the manual. I suspect that the Primary spring is the most likely suspect, allowing the weights to overcome the tension of the spring too easily. Just wanted to make sure what I was thinking was sound!

 

[slarson]

looks like I will try the spring first, it is only about 18 bucks, and I will also check the secondary spring too......I will keep ya posted, doing it this weekend.

 

[slarson]

Guys,

I changed the primary spring, come to find out it has a blue/red spring in the primary and should have had the green violet spring, so needless to say it is now about spot on, so thanks for the replys!! I am checking out the secondary this week to make sure all is alright there too!

 

[slarson]

Thats what happens when you buy a used sled! I bought it with 900 miles on it and ASSUMED it was all stock like I was told. I am thinking someone may have attempted to clutch it? Just glad it is better, and that it was an easy fix.