| Author | Message | ||
     Team_flash |
On my 2001 X1 I have 8" stretch and put a tire on that is hooking up much better but now I am wheeling too much. Currently I have a 54/23 and shift into 5th about 1000' from the finish. I was thinking of changing to a 52 tooth rear. I cannot change the front to smaller because the chain will rub due to clearance. What do you think?  | ||
| Hybridmomentspass |
Where is the clearance issue at if you go to a smaller front pulley? I ask cause Im 6" over and running 19/51 I cant comment on shifting etc cause now the bike is different (now I have the longer arm and more power/tuned, havent got a solid run yet) | ||
| Hybridmomentspass |
also - AHDRA.com go to the "talk shop" section, probably get some more info there | ||
| Team_flash |
Hybrid, the clearance issue is just behind the front sprocket where the top of the chain goes. If I go with a smaller front sprocket I am sure it will rub. I have checked the other web sites and found the common gear ratio is about 2.53. I am only at 2.35 and when I hook up launching at 4500 rpms the bike just wants to go skyward so I thought gearing would be the answer. Maybe this is not the case and I need to do something else. As it is I am only getting 1.75ish 60' times. Consistant but I believe not the full potential.  | ||
| Blownharley |
1.75 is not bad if you pass the 60 foot like in the first picture  If the 1:st gear is too short you probably have to change into second before you have passed the 60 foot mark. (Message edited by blownharley on June 19, 2012) | ||
| Littlebutquick |
HAVE YOU TRIED A HIGHER TYRE PRESSURE I RUN 20 TO 24 IF I CAN GET AWAY WITH IT 1.45 60FT 6" OVER STOCK WORTH A TRY ITS CHEEP | ||
| Team_flash |
LbQ, you are reading my mind. I decided I will keep my gearing, reduce my burnout and run 20# instead of 14#. This will depend on the track conditions because test-n-tune nights the track is not prep'ed as good as it is for races. I am going to a different track this Saturday which I am very excited about. I love going to tracks other than my home track. | ||
| Hybridmomentspass |
Team - are you referring to the Swingarm block, is that what you worry will contact with the chain? Like I said, Im running 19.51 and have zero clearance issues, though I did have some with the stock ALUMINUM swingarm (they are really thick at the front) | ||
| Team_flash |
Hybrid, as I recall it is the piece that the swingarm and engine mount to. Does that make any sense? | ||
| Hybridmomentspass |
yep, know what youre talking about exactly. I still stand by my post about clearance, you should have no problems going to a smaller pulley When I first extended my arm etc we had the chain a little too loose and it DID touch the part youre speaking of, but I pulled the axle back about 1/4" or so and have had no problems since | ||
| Williep13 |
They make a spacer to fix your chain clearance issues. I run a 20/50 or 19/51 (depending track)with a 12" extension and usually around a 1.48 60'. If you want to bring that 60' down I would recommend a 20 or 19 front sprocket. The spacer replaces the one that is currently on your trans shaft and moves the sprocket out about 1/8 inch to keep the chain from rubbing the cases. Also if your running one of those super fat chains for the high tensile strength I would recommending getting a smaller that are more pricy but lighter and you can find them with the same tensile strength as the race chains. I don't recommend Zipper's because there pricks but they usually have the spacers you need but I would shop around first. NRHS might have them I would call them first. | ||
| Williep13 |
The only way tire pressure is going to help you is if your spinning but by the picture that isn't a problem. LBQ has 1.45 60' because he is on an 1125 your X1 would be hard to do that with without a lot of work. Comparing the 1125 to the X1 is apples to oranges. | ||
| Battyone |
LBQ is 8stone and seems to find grip where there isn't any...no-one I have ever met runs tyre pressures like Joe. The next class up from us - 8.50 index- using the same shinko as joe and me run sub 10psi.. I run 12 ish maybe 14 if super sticky. The only thing that spoils Joe's 60ft is too much grip. | ||
| Team_flash |
Here is my race update from this weekend. I raced in Tucson, AZ at Southwestern International. It is much higher elevation and the air was horrible so my ET was much higher. My best 60' time was 1.75 launching at 4500 with 25# in the rear. I kicked ass running almost my exact ET until the semi when I broke out. BTW- With no smokey burnout I was carrying the front wheel and not over wheeling. Oh well I put two of their best on the trailer which isn't a brag but it made me feel like I accomplished something. I need to make it to the finals and win which I haven't been able to do this year. | ||
| Fast1075 |
Do the rules allow any clutch management, or does everything have to be stock? Is there a rule on minimum ground clearance under the bike? This is a "no bar" class?? | ||
| Team_flash |
There is a rule for minimum ground clearance but not for the clutch. Bars are allowed but I chose not to run them on this bike. I am only running high 11s. In the past I have raced faster bikes with and without bars but for this one I will go barless. | ||
| Littlebutquick |
no slicks or sissy sticks  | ||
| Hurricaneleah |
Flash, i will check my notes when i get home, but on my X1 with a 6" over arm and no wheelie bar, I have it geared to run through the traps in 4th gear, just bumping 5th in between the speed trap lines. This was more to extend first gear on launch a bit more as i foot shift my bike. The bike will typically run 1.58-1.60 60ft and has done a best of 10.52@126mph. I am running a 1.68 primary ratio though (X1 is stock with a 1.6 I think). I run a Pirelli medium compound road race tire at 28psi. I varied pressure by 2psi from 12 lbs to 36lbs and 28psi was the magic number for my set up...it really effected MPH more than 60ft up through 30psi, where it started spinning and 60ft dropped. Looking at the pics of your bike, it seems like it is still pretty high up in the air. I would try lowering it more by raising the forks in the trees and extending your strut (if it is adjustable). Good luck! | ||
| Team_flash |
Hurricane, the gear info would be helpful as I am still contemplating gearing changes so I can launch harder. I raced a couple weeks ago and made it to the semi finals again. Last weeks race rained out. |
