| Author | Message | ||
     S2forever |
At high speed cruising (> 80 mph) my S2 seems revving too high with stock belt final drive configuration (29 T front, 61 T rear). 55 teeth rear belt pulley looks good to me as it will drop RPM by ~ 10 %. Somebody has ever tried 29/55 combination on S2? Does it work with 128 T belt? Or do I need shorter one? | ||
| Buellistic |
Here is one better way which will work on all TUBE FRAME and the BLAST Models !!! XB12 MOTOR SPROCKET(38T) PN 40290-04 XB12 Primary Chain PN 40147-04 "YES", you have to get a longer Primary Chain ... This raises teeth on the motor sprocket by 3 teeth which will drop about 500 RPM in high gear for INTER STATE HIGHWAY Riding ... | ||
| S2forever |
I didn't think about it. Going from 35 to 38 means ~9 % drop in RPM (compared to 10 % for 55T conversion) I have not looked up price yet but probably primary chain is much pricier than belt... | ||
| Beardo |
If memory serves, from when I worked a parts counter, the primary chain was about $100, compared to the $150-200 for final drive belt. Changing the primary gearing is a very popular conversion for the XR1200 guys. But they went the other way. | ||
| S2forever |
Looked up price: 40147-04 ~$70 40290-04 ~$100 Interesting. 38T conv. involves a little more work and probably oil and gasket replacement. If stock 128T could be retained, 55T conv. is cheaper. Otherwise 38T seems cheaper... | ||
| 1313 |
29/55 was the OE setup for HDI (European) tubers and the same tuber belt was retained. As a side note, any standard tuber gearing (27/61, 29/55, 29/61) will work with the OE belt. I've personally ridden similar bikes back to back with US and HDI gearing. The US gearing felt *perfect* at US speed limits, however I did not care for the HDI geared bike at US speed limits. YMMV, 1313 | ||
| Hootowl |
Doesn't affect the S2, but for EFI tubers if you go with the engine sprocket option, your speedo would still be accurate. Changing the pulley ratios will throw off the speedo, since the sensor measures the rotation of the output shaft, and the ECM thinks it knows what the final drive ratio is. This is a great idea. I've wanted to drop the RPM on my X1 for a while now. | ||
| Sportyeric |
Be sure you're not expecting the Buell engine to lope along like a Big Twin Harley. We have a shorter stroke and should be revving higher. Even cruising along at 100 mph occasionally, I never feel mine is over-revving. | ||
| Firemanjim |
Aftermarket front sprockets were available in 30t,check with Al Lighton.Easiest and cheapest option. | ||
| Mcelhaney14 |
This may be a little off topic so I apologize. With all this talk on gearing and possibly affecting the speedo on EFI bikes, how is the gearing difference taken up between an X1 and S3? Are the ECMs different between the two, or the speedo? | ||
| S2forever |
Going from 29T to 30T front sprocket gives 3 % drop, which I think is too little. | ||
| Buell3some |
I changed to the european gearing (29T front/55T rear) on my EFI S3T and i love it. It takes out alot of highway buzz's / vibes and just has a better overall high speed cruising feel. Yes you can still use the stock belt. At first i tried just changing the back sprocket to 55T and leaving the stock front 27T in place. I was still able to use the stock belt but the wheel was almost to the end of adjustment on the swingarm. I wired in a S&S electronic correction box so the speedo is perfectly matched to my gps but you wouldnt need to do that on your S2. | ||
| S2forever |
With 38T motor sprocket conv., how good are these? 1) Launching from standing still (normal stop and go situ, not drag racing here) and driving in 1st gear. 2) Starting the engine. I expect not much difference as slower cranking speed due to changed primary ratio may be compensated by more torque (for the same reason). And does 38T conv. involve removing clutch side part and/or red-Loctite bolts? (Message edited by s2forever on February 07, 2014) | ||
| Essmjay |
Eric- What about the blows to the side of your head when that 100mph cruise gets too exciting? | ||
| Sportyeric |
Its not the excitement but the buffeting from the wind aggravating old whiplash injuries that get me a slap across the helmet. Any long distance at the ton is on the Sporty, as my solo ride. Same gearing, though. As the OP brings up, launch from standing still must be measured against lower highway revs. | ||
| Essmjay |
I was picturing Jackie on the back.... | ||
| Phelan |
ROFLMAO | ||
| S2forever |
Does anyone know the part number of 38T rotor/sprocket "assembly" that works on S2? I have 2 numbers from internet: 30029-08 32494-04 Either will work? | ||
| Phelan |
The -08 won't fit. You need the -04. | ||
| S2forever |
Thanks for the info Phelan. | ||
| Phelan |
No prob  | ||
| Firemanjim |
Unless you have some good HP and torque the 55tooth is poor choice--- and IIRC-- there were some different rear sprocket adjusters needed to use the Euro rear sprocket.m I ended up making some when I was still running belt on the S-2 at Bonneville. What RPM are you at at 80? Probably not close to redline so why worry. | ||
| S2forever |
Cruising at > 4000 seems too much. And sometimes I hit red. | ||
| Buellistic |
Firemanjim: RIGHT ON !!!, if your engine can not pull the HIGHER gearing over OEM STOCK, just ride in 4th gear ... | ||
| Phelan |
I've put almost all of the 8000 miles I've put on my S2T at 4000 RPMs and up because I run 80-90 most of my commute flowing with traffic. Haven't had a single issue, and the bike has over 53,000 miles on it. I use a little oil, maybe 1/2 quart a month (2,000 miles). These bikes were made to run! Lowering the cruising RPM will put your RPMs in the rev "dead spot" (lower power/torque around 3000 RPMs due to reversion) more often when hitting hills or slowing down for slow traffic, etc. | ||
| S2forever |
Thanks for all inputs. I am a guy of curiosity to not try. I will let you know next year): | ||
| Lornce |
I ran a 29T/55T combo on my T-Stormed S2 and I liked it. Ran it on my T-Stormed '96 S1 for a while, too. On the street, I liked it. Reverted to 29/61T for track use. The lower gears had plenty of torque for spirited riding (for me, anyway). And the relaxed revs at higher speeds on the highway was, well, relaxing. 4k rpm produces a 160km/hr (100mph) with the 29/55T combination. The stock axle adjusters worked just fine. | ||
| S2forever |
FYI, not mine, 125 T Karata belt(by Gates) for 55 rear sprocket (I bought some) http://www.ebay.com/itm/NEW-KARATA-REAR-125-TOOTH- 1-125-GATES-BELT-FOR-HARLEY-SPORTSTER-/33147892948 3?hash=item4d2daf104b&vxp=mtr#ht_305wt_892 |
