Back on topic, I will add: Bake, you and Bill and company are doing a fantastic job! Keep up the good work. One of the few that are taking a 1 variable approach - change one thing, then measure the results. That's the only way to get a good grasp on what is doing what. I know from first hand experience that it takes a lot of time, effort, and dedication to the cause to have the discipline to do it.

 

I hope your talking about blocking the troll instead of leaving again deej old chap

 

I have no experience riding the 331, I've ridden the 300 sorry.

I can offer that my 350 is smooth at 4000 rpm on up. And it gets there so quickly it's seamless from idle. It's still too new to tell you what highway cruising at 7000 rpm feels like.

 

On the FCR35 or any carb that has an accelerator pump but does not have a bowl that has a leak jet, the taffy mod limits the throw of the AP rod, and thus limits the duration of the AP fuel squirt. For off road applications you generally want it to be about 1 second in duration and timed properly with the opening of the slide. Proper tuning of both these parameters and a good strong fuel squirt can change a rather docile hit to one that is much quicker and harder and without any off-throttle bog.

If the float bowl has a leak jet, one would install a larger leak jet to reduce the AP fuel squirt duration. That taffy mod is for carbs that don't have that.

 

The baseline jetting I'm using for the stock bike and the 351 kit is :

40 pilot jet
2.5 turns fuel screw
Dynojet needle, on the top notch, meaning: leanest setting
140 main

It had a hesitation with the needle in the middle notch, the next one up made it better, and the last notch, whch is the leanest setting, seems good. Still looking forward to the dyno run to tell me just where we need to be.

 

Thanks for the details on the taffey mod NB. The fcr 35 sounds like its a candidate for that mod. Gracias

 

I rode an additional 75 miles yesterday.

I rode everything from the ditch at 4 mph, 30 miles of gravel roads, city streets, and some 2 lane county roads where I could open it up a little. I ran it up to 7k for a couple of miles, and I had no problems. It is quite evident that this engine wants to be in the heart of the RPM range-3500 rpm to 6500 rpm. It used to be, to get any highway cruising power, on the 250, it had to be rung out to 7000 rpm or higher, and it wouldn't accelerate in 6th with any enthusiasm. 6th gear was almost useless.
Not anymore.
It can pull 6th gear easily, and if there were need to, I believe you could drop 3 teeth off the rear sprocket for even more cruising speed at a lower rpm, say cruise at 6000 instead of 7000, and STILL have acceleration available.
My bike was surging just a little bit at 7000 rpm, I think it's still lean at the MJ, so I'm going to try a 142 next.
I'm not one to show off, but I did get a roll on wheelie in 2nd gear as I left for the ride. It surprised me.

 

Sounds Great....Im close to starting the mod.......I think.....

Keep u the news.."Bake"..

Rocco

 

Great stuff bake, roll on

 

HaHaHaHa
I don't care what you call this bike, 250, 350, 351...this son of a bitch is FAST
hahaha

I think this bike will spank a DRZ400, I need to go find somebody that has one.