| Author | Message | ||
     Lpd22 |
I have an 04 12r, and I am looking to keep the belt, but i was wondering if they make different sized sprockets that will work with the belt. I was reading somewhere on this board that the 9r sprocket has less teeth? Just curious to know if its true. Or what my options are without making the jump to chain. I love the maintenance free belt.  | ||
| Birdy |
I think you're seeing the Primary chain talked about, not the final drive belt. They're talking about changing both front and rear sprockets and a new chain as I understand it. The 9 will give better pick-up out of the hole where the 12 as better top-end. Don't see how you could change a sprocket without a different belt. (Message edited by birdy on June 22, 2008) | ||
| Spatten1 |
Can't do it because there is no adjustable tensioner system. It's designed for one ratio only. You can go chain drive relatively easily if you want different ratios. There are kits from distributors, and also Saintly has helped a lot of people whose belts crapped out, but getting them back on the road with a chain. | ||
| Retrittion |
You are reading about changing to a 9 primary -- a cool mod. | ||
| Bombardier |
Freespirits has a spring tensioned belt tensioner. It may be able to move enough to accomodate a different front belt sprocket. The primary sprocket is the easier of the two to change the gearing as it does not affect your speedometer. | ||
| Jlnance |
lpd22 - in case it isn't clear what a primary chain is, there is a chain and a couple sprockets behind the transmission cover. You can replace that with the one from the CityX to lower your gearing by 11% if you want to. | ||
| Rah7777777 |
Trojan has a different ratio belt sprockets, but I think its for the 03's only. | ||
| Lpd22 |
Thanks guys for clearing that up for me. I appreciate it. | ||
| Ferocity02 |
Man... if a company made different sized pulleys, belts, and spring tensioners they would make an absolute KILLING! Anyone up for the challenge? | ||
| Bombardier |
Petebueller is currently making a bigger primary sprocket for those who want more top speed and a lower cruising rpm. | ||
| Petebueller |
I'm having a 42 tooth primary pulley fitted tomorrow. That's 4 teeth up on the stock XB12. 41 tooth was tested and works well. I'll be looking for someone who races to test a 43 tooth. The 43 tooth will be checked for fit on my bike, but I think it is getting too big for street use. 41 tooth rev limited at 240 kph (stock is 225 kph) but was also much smoother. 42 tooth will be capable of 245 kph if the bike can pull it. It should be good for touring. 100kph (60 mph) at about 2750 rpm I'll get a 40 tooth made up and check that out next. If 40 fits with a stock chain I think it would be a practical size. | ||
| Fireboltwillie |
i have always wondered why someone has not come out with different size belt sprockets. think of a bicycle with a fixed chain. you can have a smaller rear sprocket and a larger front sprocket, you will get more top end speed (larger gear inches) and if the ratio is right, you can keep the same belt. | ||
| Petebueller |
I looked at this before I decided that without a chain conversion there was nothing that I could do to change the secondary drive ratios. I changed sprockets on most of my bikes to get setup the gearing I like. A different size for the belt pulleys just does not seem doable, even if the idler pulley is changed as well. On a bike with a fixed chain, if you change the sprockets and keep the same sized chain you adjust the rear wheel to tension it. With the XBs there are three bits that have to work together because of the idler pulley which does the tensioning. Then it all has to clear the swing arm and fit with the space allowed for the brake pedal etc. There is just not much to play with. The primary gear change is "wet" but it is about the same effort as removing the rear wheel and changing 3 belt pulleys and would be less expensive than changing the belt pulleys and you don't need to re-calibrate the speedo. Overall it just seems the way to go. | ||
| Retrittion |
I would be interested in a 40 for my 12 if it fit the other stock parts -- would mellow the torque curve a bit, bring 5th into a purely overdrive role and ease up 1st for in-town riding (at least mine, lots of 15-25 MPH zones here). I would love to see a "built" 88" ECMspy'd out running a 43, especially if we can figure out how far you can push the RPMs on these engines (seems like 7.5K-8K RPMs should be sustainable with a "built" engine, right?). | ||
| Petebueller |
Hi Retrittion I need to find others as well. I'll post a bit on the BuellerParts sponsors thread because the topics don't end up going into the archives so fast. Basically there is only one option - 42 teeth, but it works well. I would have liked a 40 tooth option with a stock chain, but it is too tight. 39 teeth won't work until a chain is stretched, and the difference is so marginal that it is not worth doing. 43 teeth went on, but there was no room for the adjuster. 42 teeth with an extra 2 links goes on just right, it also works nicely. I have placed an order and hope to have them available in 2 to 3 weeks. | ||
| Retrittion |
nice -- PM me with details. depends on cost of course but this stock 12 one is just not quite enough or too little to be really rideable -- though I really don't want to go the 9 route so this would be a very appealing alternative. I'm right about this being a wet swap-out right? Good for a rainy day project (like I need more of those, heh). | ||
| Bwesky |
im just investing in a chain convrsion, would cost about the same... seeing as the pulleys for the drive belts are very expensive. | ||
| Petebueller |
Hi Retrittion, I've sent you a PM. I've also posted the price on the BuellerParts sponsors forum. I had this made because I kept lifting the left toe in top gear. My friend with the race bike was also pretty pushy. I haven't done it as a money making venture, and I am trying to keep the price reasonable. Wet days are good for wet swapouts. Secondary drive chain conversions have advantages Bwesky, but when I started looking they were $1500. I think they are cheaper now, but you need to recalibrate the speedo (you can buy devices to do this). On balance I preferred the primary conversion - keep the belt and the speedo isn't impacted by the change. The secondary conversions give you more options on ratios etc so they are perfect for some. |
