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post #11 of 17 Old 09-06-2017, 02:25 PM
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Yes. a 15T front sprocket is the largest that will fit easily. You should be able to get a 36T steel rear at Honda that will fit.


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post #12 of 17 Old 09-14-2017, 07:31 PM Thread Starter
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I did my first test fuel economy run on my cbr today. I rode with my friend and fellow hypermiler on our ~100 mile test loop between Livermore and Patterson ( CA) . The weather was cool and somewhat windy. We did not ride on the freeways so cruising speeds were 45 to 60 mph. We had some Mexican food for lunch and returned to the starting point gas station and refueled. My results were 1.185 gallons used to travel the 104.7 miles; 88.35 mpg. Alan rode a KLR 650 and got 80mpg. Needless to say we were both pleased. I did make a fully enclosed front fender since my CBR was missing one. MY next mod will be installing taller gearing : 15t on the front and 36T on the rear.
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post #13 of 17 Old 09-14-2017, 07:41 PM Thread Starter
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post #14 of 17 Old 10-13-2017, 04:30 PM Thread Starter
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I acquired a 15t front sprocket and a 36t rear. I checked the sparkplug and valve clearance and all is within spec. I installed the front sprocket and found I need to modify the cover for it to fit. I tried to install the rear sprocket but got frustrated by the super tight bolts. So for now I'll just test it with new front sprocket.

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post #15 of 17 Old 10-13-2017, 06:16 PM
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I think I had to cut off two little nubs from the plastic front sprocket cover and slide the metal case saver forward in the bolt holes to make just a few thousandths more room for the 15T.
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post #16 of 17 Old 10-15-2017, 02:14 PM Thread Starter
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I'm loving the 15T sprocket! My CBR pulls it easily and will still pull well after I install the 36T rear sprocket. Definitely some speedometer error.

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post #17 of 17 Old 10-15-2017, 02:41 PM
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I use the 12oClockLabs speedo DRD to get my odomometer to within about +1.0025
.
http://shop.12oclocklabs.com/index.p...&product_id=59
.


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