| Author | Message | ||
     Preybird1 |
Hey all. Is any one running larger cylinder stacks on there x1. If so what is the largest that will fit on this model without frame clearance problems. I would like to consider this as nrhs said the big bore 1250 cc kit would give my bike anywhere from 15-25 rwhp. Any feedback will certainly help. Thanks guys\gals | ||
| Kyrocket |
I'm in the same boat. I just received my 1250 NRHS cylinders (thanks Justin) and know they'll bolt on, but what about the 1450 cylinders I see as dealer take offs on the bay for $100 cylinders and pistons? The 1250 kit is a bolt on kit without any mods or so I've read. I'm assuming the 1450 would maybe require spreading the bolts or some other major modification. Out ECM's will also work with 1250cc's but I have no idea as to what point it would have trouble keeping up. I have read NRHS's website end to end and also have been spending much time in the KV but some stuff just can't be found. That or I'm not looking in the right places. Oh yeah, don't get me started about squish bands. | ||
| Bandm |
Check here: http://www.badweatherbikers.com/buell/messages/384 2/383825.html?1220200731 http://www.badweatherbikers.com/buell/messages/21/ 400923.html?1223417993 1450 cylinders are Big Twin, not Buell/Sportster. | ||
| Jos51700 |
Specifically, 1450 cylinders are stock TwinCam88. To my knowledge, the 1250 kit doesn't increase the height of the cylinders. Only the bore diameter increases. I know I'm limited in this opinion, but I think 50cc is hardly worth it. If I were going to pull part one, I'd go really big and do it right. On an XB9, it's a huge difference from an XB12, because you get to keep the short stroke. I prefer thicker, more stable cylinder bores (and the subsequent better ringseal) with higher compression pistons, as opposed to a mega-overbore and the same compression. If the bore can't stay perfectly round (and removing that much material weakens them alot), blowby becomes more of an issue. Better heads will get you way farther than 50cc, and the motor will keep more power in the combustion chamber to boot. The true key to horsepower is in the heads. $700 will buy you alot of headwork. Again, Just my .02. | ||
| Jos51700 |
BTW, I've ridden a stock bore, stock stroke (and therefore stock displacement) '06 XL1200 with T-man heads and some good cams, that produced 120 horsepower, from about 1800 RPM all the way to redline. You'll never go for cheap heads after a ride like that. "Peak" horsepower is for suckers. | ||
| Scott_in_nh |
Horsepower is made with head mods, cam selection, compression and tuning. 50cc alone isn't worth squat, 2-4 hp tops. If you NEED new pistons and/or cylinders anyway - why not? but it isn't much of a mod. | ||
| Bad_karma |
1250 and 88" kits don't raise the cylinder height. I know the 100" does, not sure about 90" motors don't believe so. I have both the 1250 and 88" in my tubers using the stock mounts with no problems. 1250 is a drop in the 88" and bigger will require case milling at a minimum. Joe | ||
| Kyrocket |
I agree 50cc's isn't much but I had to pull the cylinders anyway for base gasket replacement and I got a good deal on the 1250 cylinders. I would like to find someone who has done this before and find out which gaskets they used for a .030 squishband. Optimal according to NRHS, according to their website most if not all factory motors are .050 or better, I guess erring on the high side is better than a piston slapping the head on initial fire up. This is going to be an all winter project so I have time to do my research. | ||
| Jos51700 |
You NEED to measure your squish band with the 1250 kit installed, and THEN start looking for gaskets. Production tolerance strikes again! | ||
| Phelan |
The 1250 kits run about 5% more power than their 1200 counterparts. That's both are same compression, shape, and forge. The biggest reason to go with 1250cc is if you are planning on using forged pistons, which are lighter and stronger than stock, especially useful in changing compression. Of you don't want to split the cases, but you are still matching performance oriented heads and pistons, 1250 is for you. Cheap rebuild it is not. Oh and 1250, 1430, and 1475 kits from NRHS are all the same height, just different bore. Cases have to be bored to fit the 88"(1430cc) or 90"(1475cc) kits, and the center bolt in the case has to be in the cases to be machined to match the bore. S&S 100" motors will fit in tube frames with minimal to moderate modifications (ask Aaron Wilson of NRHS), while the 99" Zippers kits among others will not fit without substantial modifications. (Message edited by phelan on October 09, 2008) |
