Having trouble trying to figure out what my bike is doing. When reving out the gears there doesn't seem to be a sound change, but the bike continues to get faster. I'm trying to figure out if it is the clutch I just installed slipping or just the way the pipes are with the porting. Its almost like the bike is not reving all the way out. Before the porting and the clutch you could tell when to shift by listening to the motor. Now after reving out and shifting it sounds the same. I'm very confused and need any help you guys can give.

Thanks
David Chapman

 

Have you geared the bike up(bigger front gear or smaller rear gear)the more horsepower you make the more you need to gear up. If you have not, try this first if this doesn't work then look into your clutch. After porting and larger bore, I went through gear changes,dropping tire pressure, and switching paddle tires before I realized the clutch could not hold the extra power the bike was making. It would pull hard out of the hole but wouldn't drop rpm's alot between gear changes. My guess you need a Barrnet Kevlar Dirt Digger clutch, some guys change their clutchs every year and sell their old clutchs to guys with stock set ups that will get a few more years out of them.

 

I have played with the gearing. Had a 14/41 when I went to the dunes and went to a 13/41. The differance was I could get to a higher gear, but the bike still felt like it was just falling off the power. I did just install a new clutch but I only used 3 new springs with 3 stock springs. I guess I'll start by putting all the new springs in, and readjusting the clutch.
Any other suggestion appreciated
David Chapman

 

I went too the ITP web site and took a look at your tires you have(holeshot xct's) If you were using these in the sand this is more than likely your problem, you have to run paddle tires in the sand if you want to lug the motor down and make that bike go. Take your bike with those tires to a clay track and increase your front sprocket or run a smaller back sprocket.

 

If the clutch were the problem, it would rev really high and just not get any speed. The way I understood your post was that you arent getting any revs, so its not the clutch. When a clutch slips, the engine revs higher but the clutch slipping just doesnt let any of those RPMs go to the tranny and move the wheels. So it would actually rev higher than normal and just not go as fast. In fact I had a clutch go completely out of my 300ex where the throttle could be pinned and the motor revving just like normal, it just woldnt go anywhere. I cant see it being the clutch. I think it is probably your choice of tires just digging up sand and not going anywhere in a hurry. Switch to some paddles and let us know of that helps. Or take your bike out on a track or woods or some hard pack and see what it does.
Good luck

 

I know what your saying, when im on the road and i and on mine hard in around 5th and 6th when i shift and pop the clutch and hit the throttle it revs out high and then i can feel a pull slowely coming on, my clutch slips for about 3seconds and then hooks up and thats when you feel it come out under you. I would say it is your clutch, because there is nothing else it can be, except your not getting any traction what so ever. try putting all 6 springs in and see if that helps, i bet it will.

 

Thanks for the help so far. Just to clear things up when I go to the dunes I run a v shaped paddles that are 20's I think they are called sand sharks. I also run the smooth fronts with the line in the middle up front. I really havent tried to run the bike anywhere else yet. I had a 15 for the cs sprocket with the 22 inch tires and was told that was to big so when I went to the dunes with the smaller tires I had already changed to the 14 and then to the 13 after I got there.

Thanks again and keep them coming I'm sure someone with these pipes knows what I'm talking about.

David Chapman

 

going to a 14 to a 13 makes the revs closer together & the more you will half to shift less strain on the clutch hope that helps

 

just some food for thought my 250r with 22in paddles is running 13/39

2" decrease in tire size will need about 4 teeth decrease at the rear sprocket

increasing your front sprocket 1 tooth would be about the same as decreasing your rear sprocket 3 teeth

Tire pressure is important too I run 3-4psi

The v-shaped paddles do slip in the sand alittle more than straight paddles.

The amount of paddles matters too, I run 10 paddles, a 8 paddle will also slip with the more power you have.