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Old 07-14-2013, 10:29 PM   #766
Sibbo
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Location: Tweed Valley , Northern NSW
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Quote:
Originally Posted by Prutser View Post
For a re-build all road R100R I made a fiberglass toolbox on that place. Personally I like my tools to be a bit easier to reach. So when I am traveling I don't have to take the luggage and the seat of to grab my tools.
But I'm still thinking about where to put them safe and dry.The last trip they were in a bag on one of the racks above my cylinders. But after every river crossing my tools were wet for days.( toolbox...next project )

For another bike I made a bash plate that holds the battery. That bike feels like its half the weight of a standard bike.Really a huge difference .


But for this ST I think I will leave it like it is for now.
Really interesting ideas, my ST has a 100GS tank and for long trips on the tar it's great but the weight is too high on the dirt or moving very slowly.

Thinking, thinking .
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Old 07-15-2013, 12:35 AM   #767
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Quote:
Originally Posted by Sibbo View Post
How many rpm are you doing at 60mph 79 ?
Sorry, I don't know yet. I bolted up the neg. cable for the first time yesterday to see if all the electrics work. The Eastern Beaver headlight relay kit worked well and the starter engaged, but sadly the turn signal relay seems to have bit the dust.

Like you suggested I don't expect the 5% taller gear to be a great change - just something I could do while I had the box apart and with the lower ratio of the f/d I can't imagine it'll put much more strain on anything. Airhead engines run just fine for hours on end at the upper rev. limits though so don't worry about that.
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Old 07-15-2013, 03:42 AM   #768
hetkind
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Quote:
Originally Posted by Sibbo View Post
Hmmm... that's pretty much what my girl does, I guess I'm just averse to much over 4000 rpm sustained . I like revs on the hills and twisties but not for hours at a time .... no good reason .
Actually these bikes are designed to run between 4-6k on a continuous basis...normally I run mine between 4-5k. 4K is suggested as a minimum RPM for normal use.

Howard
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Old 07-15-2013, 03:51 AM   #769
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Originally Posted by hetkind View Post
Actually these bikes are designed to run between 4-6k on a continuous basis...normally I run mine between 4-5k. 4K is suggested as a minimum RPM for normal use.

Howard
Really? I've never seen that quoted before , it certainly puts my prefered use outside guidelines !
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Old 07-15-2013, 04:58 AM   #770
hetkind
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Originally Posted by Sibbo View Post
Really? I've never seen that quoted before , it certainly puts my prefered use outside guidelines !
The 4k normal RPM range is based on 3k required for full alternator operation and 4k is suggested as not to "lug" the engine and to give full oiling to things like the valve train and timing chain.

This figure has been highly debated on the "Airheads" list server and supported by some of the American "gurus" like Oak, Snobum and Cutter, two of those I know personally and one who has been a houseguest of ours.

Howard
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Old 07-15-2013, 05:46 AM   #771
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Quote:
Originally Posted by hetkind View Post
The 4k normal RPM range is based on 3k required for full alternator operation and 4k is suggested as not to "lug" the engine and to give full oiling to things like the valve train and timing chain.

This figure has been highly debated on the "Airheads" list server and supported by some of the American "gurus" like Oak, Snobum and Cutter, two of those I know personally and one who has been a houseguest of ours.

Howard
OK, good to know although I usually bumble along at between 3000 and 4000, I'll try to overcome my prejudice against high revs !
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Old 07-16-2013, 06:52 AM   #772
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Anton has a good gear ratio chart, you can play with different rear end and gear combinations to find theoretical rpm's at speed...

Per his chart, the standard ST with a 37/11 (3.36) rear end, at 5000 rpm in fifth you are doing approx 75mph.

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Old 07-16-2013, 06:59 AM   #773
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My results agree with what Bob just posted from Anton's info. My tach starts to get erratic when cruising at anything over about 5200 for more than a couple of minutes. But during my slogs up I-95 to get out of Flatistan and onto regular hiways I'm matching most car traffic at 5K rpm. And experience has shown that most traffic on that stretch runs at about 74-75 mph.
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Old 07-16-2013, 07:04 AM   #774
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Finally figured a way to put Anton's chart on here (but it is interactive if you go to the site)




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Old 07-16-2013, 07:54 AM   #775
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Quote:
Originally Posted by bpeckm View Post
Finally figured a way to put Anton's chart on here (but it is interactive if you go to the site)



The one thing to remember with that is that it assumes a 6.6 foot wheel circumference. I'm not sure what the circumference of the 18" ST rear wheel is. Anyone care to wrap a measuring tape around?
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Old 07-17-2013, 06:38 AM   #776
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I measured mine with a 50% tread Avon Distanzia and got 6' 10".
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Old 07-17-2013, 07:20 AM   #777
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Quote:
Originally Posted by mark1305 View Post
I measured mine with a 50% tread Avon Distanzia and got 6' 10".
...which is exactly what I happen to have on my back wheel at the moment. 82/79 = 1.0379 so add 3.8% to those speeds for our wheels.
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Old 07-17-2013, 07:31 AM   #778
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Quote:
Originally Posted by mark1305 View Post
I measured mine with a 50% tread Avon Distanzia and got 6' 10".
Got the same thing with a fairly new 606.
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Old 07-18-2013, 08:42 AM   #779
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Something drifted through my brain this morning about wheel circumference - I have a faint recollection that rolling circumference may be different than static measurements due to the slight reduction in radius at the contact patch as the tire deforms ever so slightly from the load on it. May be hogwash, or something I dreamed. If the rain showers will hold off for a little while I will roll the ST out and pick up the actual rolling circumference with my weight on the bike.
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Old 07-18-2013, 02:21 PM   #780
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Quote:
Originally Posted by mark1305 View Post
Something drifted through my brain this morning about wheel circumference - I have a faint recollection that rolling circumference may be different than static measurements due to the slight reduction in radius at the contact patch as the tire deforms ever so slightly from the load on it. May be hogwash, or something I dreamed. If the rain showers will hold off for a little while I will roll the ST out and pick up the actual rolling circumference with my weight on the bike.
or simply go to the AVON website and get the outside diameter...

Howard
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