Also can it cruise 75 mph pretty well? Im working on a xr, and i want to be able to cruise on the highway, as well as do some trails/fire roads etc. It has 13/50 right now and i was going to put on a 15/48 and keep that 13 front for knarly trails and just change it onsite
The issue with that is i dont want to have to change the sprocket in the field if i dont have to. In your proffesional opinion what is the best ratio for a decent time on the highway, and enough power to lug some trails
Yes...stock ratio. A bit low gearing for highway. I run this for combination dirt/highway and to keep a load off the clutch in single track crawls. The rear tire is slightly oversized, which makes the gearing just a tad taller, not equivalent to a 15/48 or other sprocket changes, though...Frankly, for dual-sport riding on asphalt, I'm always hunting for a sixth gear on upshifts-and there isn't one! (My '84 XR350R is a six-speed; my XR500R slated for restoration is five speeds like the XR650R.) Trust this helps...Join us at the Motorcycle Tech and Travel channel: youtube.com/@motorcycletechandtravel. There's a lot of content on the XR650R there.
For cruising 75 mph, it will do it with the 14/48 but is a waste of fuel and creates unnecessary piston travel. These engines have so much mid-range power that there is no need to ever experience the rev limiter. Your 13/50 ratio must be a real "tractor" for off-pavement and way low for highway! My bike will likely stick with the 14/48, as it does surprisingly well on slow, idle-and-tip-in single track, even with the HotCams Stage 1 camshaft (which does not seem to bother the slow speed performance). 15/48 might be "okay" to save sprocket changing, especially if your sights are set on a 75 mph cruise speed...Let's continue this conversation at Motorcycle Tech and Travel, I'd like to stay in contact around your plans, and our exchanges would be helpful to others!
Estimated crankshaft horsepower, and I've not confirmed this on a wheel dynamometer. This is an estimate based on the build and known, similar (aftermarket and over-the-counter HRC upgrade parts) engines that have been dyne'd. Tune plays a role, too. I've ridden a lot and know power-to-weight ratios of various (wet weight) motorcycles. This estimated 55 crankshaft horsepower, if anything, feels conservative. I would like to dyne my bike at sea level, tuned for that elevation. I'm riding at 4,200 feet elevation but frankly the bike still feels like 55 horsepower. The formula for power loss is approximately 3% per 1000 feet of elevation above sea level. As such, I'm "losing" 6.93 horsepower where is live. I can't feel it.
I like so much would you said, except for when you got to the sprocket, and you decided that a sprocket that is aluminum with a piece of Steel riveted to it is better than just a steel sprocket the way they came stock they never came with an aluminum gear in the rear, aluminum wears very easily and quickly, that's why they don't make sprockets out of aluminum, and nobody uses aluminum sprockets unless they're just stupid because the weight difference in the motorcycle makes no difference in the weight difference in the drivetrain of the motorcycle makes no difference if it's aluminum or if it's deal therefore that statement is just a bunch of high band it means nothing and it makes no difference whatsoever. Of course that's my perspective because of the things that I've studied and seen. And I'm not just a normal guy on the street I promise you. Have a great day peace beyond your house
I value your opinion and experience. SuperSprox has supplied the motorcycle racing community with patented sprockets for over six decades. They are a supplier to KTM, Yamaha, Honda HRC, BMW and Husqvarna race teams. The SuperSprox website has more information at www.supersproxusa.com/. The UA-cam video at ua-cam.com/video/gNZzSGtCCBI/v-deo.html talks about SuperSprox construction features...My research and experience make me a SuperSprox fan. The zinc nickel sprocket mated securely to an aluminum center provides stamina. A special coating process is corrosion resistant...Like you, I have run and still run solid steel sprockets on my bikes with more moderate horsepower. However, the high output Honda XR650R can benefit from a SuperSprox sprocket.
What ratio are you running? 14 48?
Also can it cruise 75 mph pretty well? Im working on a xr, and i want to be able to cruise on the highway, as well as do some trails/fire roads etc. It has 13/50 right now and i was going to put on a 15/48 and keep that 13 front for knarly trails and just change it onsite
The issue with that is i dont want to have to change the sprocket in the field if i dont have to. In your proffesional opinion what is the best ratio for a decent time on the highway, and enough power to lug some trails
Yes...stock ratio. A bit low gearing for highway. I run this for combination dirt/highway and to keep a load off the clutch in single track crawls. The rear tire is slightly oversized, which makes the gearing just a tad taller, not equivalent to a 15/48 or other sprocket changes, though...Frankly, for dual-sport riding on asphalt, I'm always hunting for a sixth gear on upshifts-and there isn't one! (My '84 XR350R is a six-speed; my XR500R slated for restoration is five speeds like the XR650R.) Trust this helps...Join us at the Motorcycle Tech and Travel channel: youtube.com/@motorcycletechandtravel. There's a lot of content on the XR650R there.
For cruising 75 mph, it will do it with the 14/48 but is a waste of fuel and creates unnecessary piston travel. These engines have so much mid-range power that there is no need to ever experience the rev limiter. Your 13/50 ratio must be a real "tractor" for off-pavement and way low for highway! My bike will likely stick with the 14/48, as it does surprisingly well on slow, idle-and-tip-in single track, even with the HotCams Stage 1 camshaft (which does not seem to bother the slow speed performance). 15/48 might be "okay" to save sprocket changing, especially if your sights are set on a 75 mph cruise speed...Let's continue this conversation at Motorcycle Tech and Travel, I'd like to stay in contact around your plans, and our exchanges would be helpful to others!
55hp on dyno or at motor ?
Estimated crankshaft horsepower, and I've not confirmed this on a wheel dynamometer. This is an estimate based on the build and known, similar (aftermarket and over-the-counter HRC upgrade parts) engines that have been dyne'd. Tune plays a role, too. I've ridden a lot and know power-to-weight ratios of various (wet weight) motorcycles. This estimated 55 crankshaft horsepower, if anything, feels conservative. I would like to dyne my bike at sea level, tuned for that elevation. I'm riding at 4,200 feet elevation but frankly the bike still feels like 55 horsepower. The formula for power loss is approximately 3% per 1000 feet of elevation above sea level. As such, I'm "losing" 6.93 horsepower where is live. I can't feel it.
I like so much would you said, except for when you got to the sprocket, and you decided that a sprocket that is aluminum with a piece of Steel riveted to it is better than just a steel sprocket the way they came stock they never came with an aluminum gear in the rear, aluminum wears very easily and quickly, that's why they don't make sprockets out of aluminum, and nobody uses aluminum sprockets unless they're just stupid because the weight difference in the motorcycle makes no difference in the weight difference in the drivetrain of the motorcycle makes no difference if it's aluminum or if it's deal therefore that statement is just a bunch of high band it means nothing and it makes no difference whatsoever. Of course that's my perspective because of the things that I've studied and seen. And I'm not just a normal guy on the street I promise you. Have a great day peace beyond your house
I value your opinion and experience. SuperSprox has supplied the motorcycle racing community with patented sprockets for over six decades. They are a supplier to KTM, Yamaha, Honda HRC, BMW and Husqvarna race teams. The SuperSprox website has more information at www.supersproxusa.com/. The UA-cam video at ua-cam.com/video/gNZzSGtCCBI/v-deo.html
talks about SuperSprox construction features...My research and experience make me a SuperSprox fan. The zinc nickel sprocket mated securely to an aluminum center provides stamina. A special coating process is corrosion resistant...Like you, I have run and still run solid steel sprockets on my bikes with more moderate horsepower. However, the high output Honda XR650R can benefit from a SuperSprox sprocket.