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Twins Talk Discussion of Hinckley Triumph Twin related matters and topics. Sponsored By: Throttle Mojo

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Old 08-24-2012, 01:07 PM   #1 (permalink)
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Weight Loss

We are fortunate to ride fairly rugged, durable, well built motorcycles, but, with their more or less traditional steel frame, they are no lightweights. I know that some members here have achieved fantastic weight savings, but I assume this is at a fairly substantial cost. I've been thinking about which components can be removed or changed on my Thruxton to lose a few pounds without breaking the bank. There is a fantastic custom bike posted in http://www.triumphrat.net/twins-talk...ight-twin.html but, it's just that; a fully custom built bike that happens to have a motor based on our twins.

So, keeping the frame (with no surgery), swing arm, motor reasonably stock (i.e. no ripping out balance shafts) and, for the EFI bikes, the fuel tank, where are the weight savings to be had? Things like obviously stuff like AI removal, air box removal, FEK, etc. come to mind as saving one or two of pounds collectively. Also, lighter weight exhaust, rear shocks, wheels (can be $$$), brake discs, battery, but I really can't think of much else. Other than getting my lard-ass to the gym, any ideas?
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Old 08-24-2012, 01:52 PM   #2 (permalink)
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It might be easier (healthier) to have the rider loose a few pounds...
But at 160, I don't have much to loose...

Personally, as I wear (break) things, I replace them by lighter stuff. I've replaced the handle bar by a aluminium one... Next on the list, will be lithium battery (next spring)
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Old 08-24-2012, 01:55 PM   #3 (permalink)
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I've been doing Slim-fasts for lunch. The bike is just starting to feel faster.
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Old 08-24-2012, 02:30 PM   #4 (permalink)
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You hit all the big ones. After that, the pounds get a little tougher. I did everything you mentioned on my Scrambler except the battery. I'm going to buy a Shoria when mine goes bad. Also, the Scrambler had heavier bits to begin with (20 lb. exhaust) so the jump to a Zard cross at 6 lbs. for example was substantial.

I did put on aluminum front pegs and took off the rear. You can cut the v shaped bracket holding the rear pegs too if you are not altogether keen on a stock frame. Lighter sprocket cover and chain guard gives a few more oz. Lighter headlight bracket, etc. You can also swiss cheese anything as long as you don't compromise any important load bearing parts. Plastic or light aluminum rear fender, or take it off altogether. A super light aluminum front fender is a little lighter than the stock plastic one, but not by much. Aluminum handlebars (maybe not on a Thrux. don't they have clip ons?), smaller, lighter handlebar switches, small mirrors, carbon fiber parts like sidecover and tank, etc.

It really depends on how fanatical you want to get.

Here are some extreme measures. Oil in frame kit to drop the oil cooler, shave the flywheel (this is done for quicker revs, but will drop weight a little). Get an aluminum kickstand fabricated, etc.

I think it's great fun to try to make these bikes lighter. I think there's a point you reach where you have to do a cost vs. benefit for a lot of this stuff.

I'm anxious to see what others have done. It's also great to see the old chestnut "go on a diet" jokes again. One guy even talked about racers getting enimas before a race. That too would be a little extreme.
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Old 08-24-2012, 05:40 PM   #5 (permalink)
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Quote:
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It might be easier (healthier) to have the rider loose a few pounds...
Ha Ha - You're right, that's probably the best "mod" and the money saved on food can go towards the bike For the record, I did get myself back into shape a couple of years back and lost a bunch of weight.

Anyway..... back to the bike, I'm not overly obsessed with getting the bike as light as possible, but if there are a few pounds that can be easily shed then great.
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Old 08-24-2012, 11:23 PM   #6 (permalink)
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Oil in frame doesn't save much weight. The extra oil capacity is about equal to the weight of the very light oil cooler. But all the other easy stuff has been suggested. You have to do surgery on the frame, rewire the bike, get an alloy tank etc. to drop more. I am at about 385lbs dry, but the triple clamps and swing arm alone were about 2 grand. The first fifty lbs can be had for a couple of grand, the next 50 will cost you triple that.


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Old 08-25-2012, 12:32 AM   #7 (permalink)
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Honda CBR F3 forks and wheels. The rear wheel/tire weighs nine pounds less than the OEM. The front wheel weighs eleven pounds less, including the two rotors. That's 20 lbs of unsprung rotating mass gone before considering dual disc brakes, tubeless tires, cartridge forks, MUCH quicker handling and better tire choices. Total cost of around $1000. Paid for itself the first time I whacked the throttle and the first time I asked it to stop right effin now.



The only downside is I don't get acosted at the gas pump by old guys asking what year it is.
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Old 08-25-2012, 03:29 PM   #8 (permalink)
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Weight saving. Scrambler

I replaced battery with shorai, saved 8 lbs, more importantly, way high up on bike. Replaced stock mirrors w bike masters $17 a pair, at least 3 lbs, again way high on the bike. Arrow exhausts maybe 20 lbs, not sure.
Anyone know how to change out the very heavy front foot peg stanchion? They must weigh ten lbs each.

What other 19 inch front wheels might fit? Stock steels weigh a ton. I am ok with non spokers.

Rear wheel also heavy. Will the Bonnie cast wheel save much and will it fit?

Lighter rear pegs? Gotta have something there.

Kickstand is a great dea. Mine is too short anyway. Anything out there in aftermarket?

Other ideas?

I love this bike now. 02 sensor eliminators from power commander and throttle cam from G2 both made amazing improvements in throttle control.
John
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Old 08-25-2012, 04:02 PM   #9 (permalink)
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The crankshafts on these bikes double as balancers, and weigh about 50 lbs. Until we can figure out how to do something about that, these bikes will never be significantly lighter than stock. Still, I'm reminded of Colin Fletcher, ("The Man Who Walked Through Time", "The Complete Walker") who noted, "Watch the ounces and the pounds will take care of themselves".
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Old 08-25-2012, 06:57 PM   #10 (permalink)
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Quote:
Originally Posted by nametzj View Post
I replaced battery with shorai, saved 8 lbs, more importantly, way high up on bike. Replaced stock mirrors w bike masters $17 a pair, at least 3 lbs, again way high on the bike. Arrow exhausts maybe 20 lbs, not sure.
Anyone know how to change out the very heavy front foot peg stanchion? They must weigh ten lbs each.

What other 19 inch front wheels might fit? Stock steels weigh a ton. I am ok with non spokers.

Rear wheel also heavy. Will the Bonnie cast wheel save much and will it fit?

Lighter rear pegs? Gotta have something there.

Kickstand is a great dea. Mine is too short anyway. Anything out there in aftermarket?

Other ideas?

I love this bike now. 02 sensor eliminators from power commander and throttle cam from G2 both made amazing improvements in throttle control.
John
Sun rims (mine are 19" front and rear) save 2-3# each, and Maxxis DTR tires save about 7# total. K&N front pegs save almost 1#. I took the footpeg casting stanchions and spent some time on the back side of each with a Bridgeport and small ř end mill; not sure how much it saved. I've made two attempts at a carbon fiber cam cover and neither was satisfactory. The next one will be pre-preg and not wet layup; the tricky part is getting a good seat for the gasket.

I removed the turn signals and mirrors and use a Shorai battery. The Arrow exhaust w/o the baffle saves a whopping 22# !!

Dick
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