Stock main jet 85 tri Z

[84250r]

The S model is the 86 Z.....thats all.

Here is a pic of one...since I have not posted in a while!!

That's funny mine says (S) on the frame buy the handle bars and mine is a 85. With a 360 main jet in it.

I looked on the steering stem(goose neck) of the frame,and didnt find anything that said it was an N or S model. Strange that your says S model,and your being a 85 model. Any way you could have a different frame?

[Tri-Z Pilot]

Yeah, maybe twgranger has an 86 frame, and 84250r, you should richen up your jetting for the winter.

[TimSr]

There is no hard fast rule about how much to change jetting for specifics conditions, and hardware, whether it be temperature changes or a new pipe. In general, in cold weather bikes run much richer than normal when they are first (cold) started, then when they reach normal temp, they run leaner than normal. I would never ever just automatically change a jet because of a weather change or any other chnage without first having done some plug ckecks to see if its warranted, unless youve been through a couple of winters and know your machines individual "personality".

[84250r]

There is no hard fast rule about how much to change jetting for specifics conditions, and hardware, whether it be temperature changes or a new pipe. In general, in cold weather bikes run much richer than normal when they are first (cold) started, then when they reach normal temp, they run leaner than normal. I would never ever just automatically change a jet because of a weather change or any other chnage without first having done some plug ckecks to see if its warranted, unless youve been through a couple of winters and know your machines individual "personality".

Don't you think thats a big jump from a 470 to a 440? I checked the pilot its stock #45.

[TimSr]

Not really. Many many factors affect carburetion and I wouldnt consider that change to be out of the realm of reality, even on a stock bike. Yamaha changed it to a 360 in 86 with little chnage in factors that affect carburetion. Plug checks are the only way to know.

[84250r]

Ok,well I thought about just going back to stock main(470) with new plug and then check. Then go from there. Instead of running the 440 main.

[IneedAnATV]

That looks to be your best bet at this point in time. Keep us informed.

[84250r]

Another question is,have any of you tri-z guy's gone from a #45 pilot jet to a #52?