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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 09-26-2012, 06:34 PM   #441 (permalink)
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Interesting. I found myself complaining about the harsh ride on my first longish ride on my new bike last weekend, and was already shopping prices on Ohlins. I never dreamed that increasing pre-load would help the ride quality!
Hmmm...I know what I'll be doing when I get home tonight.
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Old 09-26-2012, 08:35 PM   #442 (permalink)
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I’ve passed on this pre-load advice to others with similar results (I read about it here too). I think the reason this works is raising the preload puts the shock higher in its travel so it has a chance to do some damping before bottoming out. The bad news is this is only a band-aid. For us light weights real help will have to come from expensive shocks and custom springs. Interestingly heavier riders (200 plus lbs) seem to have less of a problem with the stock shocks. If you want to experiment with this add a passenger and go for a ride on the roads that normally beat you up, my guess is you’ll find the ride less punishing.
To further improve things for pennies dump the stock fork oil and replace it with 5w Amsoil or similar. One liter will do both sides (500ml or less each) and cost less than $20. (If you have a cast wheel Bonnie set the oil level to 130-140mm from the top stock is 106 IIRC)
Cheers!
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Old 09-26-2012, 11:54 PM   #443 (permalink)
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Quote:
Originally Posted by tv guy View Post
...To further improve things for pennies dump the stock fork oil and replace it with 5w Amsoil or similar...
Cheers!
I'd love to try this. With the rear shocks, it was so simple to turn bottom of the shock to make the adjustment. I have no idea how to swap the fork oil.
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Old 09-27-2012, 03:55 PM   #444 (permalink)
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5W Amsoil is what you put in with Intiminators. Without them in, 5W is going to be seriously too light a weight of oil.
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Old 09-27-2012, 04:47 PM   #445 (permalink)
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Originally Posted by GTO Bruin View Post
I'd love to try this. With the rear shocks, it was so simple to turn bottom of the shock to make the adjustment. I have no idea how to swap the fork oil.
I donít want to hijack this shock thread, if the mods want to toss this feel I'll PM you the short how too-
If youíre mechanically inclined itís quite simple to change the fork oil. If you have to pay someone to do it the cost escalates
If you want to take this on first invest in a service manual for your bike. It will have step by step instructions how to do this along with tork specs for fasteners (fork oil is something that should be changed regularly, in the past it was commonly recommended once every two years or 12k miles whichever came first). Stock Bonnies come with 10w fork oil I think for most of us riding crappy pavement and gravel a lighter weight oil will work much better. The oil companies use different measuring formulas for their oils so for example 5w Belray may not be the same as 5w Amsoil, the key is to use a good quality lighter weight oil (I used 5w, big improvement). You can always change it again if it is too stiff or too soft, itís relatively inexpensive (assuming your time is free). It will depend on your weight, and bike load. 5w might be too light if you weigh more than 160lbs maybe start with 7.5 (stock weight on many old BMWs).

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5W Amsoil is what you put in with Intiminators. Without them in, 5W is going to be seriously too light a weight of oil.
You could be right, it really depends on the weight of the rider, luggage etc. and on the kinds of roads you ride. In my experience with the cast wheel Bonnie 5w works (I weigh 175 geared up). I tried 7.5w (Honda pro oil) first and found it still a bit harsh, I maybe should have tried the Honda 5w but I had the Amsoil on the shelf and so far I like it. Iíve also installed (and un-installed) the Ricor emulator, juryís still out on whether I like it or not.
Sorry again for the hijackÖ
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Old 09-28-2012, 06:11 AM   #446 (permalink)
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one other thing that affects how the forks feels, is the amount of oil - or the air gap. This air acts as a progressive spring - more oil = stiffer
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Old 09-29-2012, 07:43 AM   #447 (permalink)
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If you have a search for fork oil change or even Intiminator install, I'm pretty sure you'll come across a step-by-step guide to changing the fork oil. There's definitely a link in one thread to a guide over on ADVRider.
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Old 10-02-2012, 12:44 AM   #448 (permalink)
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I had bellyached earlier on this thread about the bizarro shocks on my new and otherwise terrific Bonneville SE. On the lowest prload setting, they felt like no shocks at all. On the highest setting, perversely, they provided a softer ride, but still punishing and insecure in the corners. My vintage BMW, 35 years old, has a MUCH better ride.

So, today I replaced the original shocks with bottom-of-the-line Hagons, $199. What a difference. The bike now rides very comfortably, only occasionally bottoming out quite softly on the softest preload setting. Control and confidence in the curves, flat and bumpy, are hugely improved. The tires seem more attached to the pavement. This is how a modern bike should feel.

It helps, too, that the Hagon shocks look good, with the black progressive springs around silver innards, but blemished by an ugly silver brand sticker that I am trmpted to peel off. Has anyone done this?

The originals I plan to donate to the Imperial British Museum of Worthless Junk.
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Old 10-02-2012, 12:48 AM   #449 (permalink)
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I also should mention that the new Hagon shocks were made up for me with lighter springs to accommodate my modest 160 pounds.
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Old 11-03-2012, 02:09 AM   #450 (permalink)
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Quote:
Originally Posted by Von Dutch View Post
+1 Works Performance Good choice. I have the same Works Performance shocks (street trackers) as you have for about 4 years now. I didn't get the ARS (adjustable rate spring) lever like yours since I only ride the Thruxton solo and don't change loads or weights. I know you will like them. Let us know how you like them after you use em and also that "ARS". WORKS are the only shocks I buy now.
Just a little update here: I've installed my new Works Performance Street Trackers with ARS (adjustable Rate Spring) on my 04' T100, and I must say, I'm extremely satisfied!! The aesthetics are a huge boost, and more importantly, the performance upgrade is unreal! What a difference!! On the softest setting (which is the setting I was told I should use to set the sag), the ride is plush. I ride at this setting most often, commuting and what not. But On Any Sunday, when I find my self on the twisty, back country roads of Northern Cali, I adjust the stiffness up a bit, and the bike gets aggressive and is so nimble - like a different bike completely. The ARS costs an additional $150 (if I recall correctly) and I was alittle uncertain how good an investment this was going to be considering they're at the high end of the pricing scale anyway. I'm happy to report after a few weeks that it was the right choice, no question. Each shock has 4 individual settings; however, according to the manufacturer, you can increase the stiffness of each shock independintely meaning instead of 4 different settings, you could potentially have 8. I personally increase the stiffness equally on each side becuase it's what I've always done and am comfortable with it, but considering the manufacturer's reputation, I trust they know their product. Additionally, the ARS allows for almost instantanious adjustment - the levers on either side can be adjusted within 3-5 seconds, and that's only becuase I'm a perfectionist Finally, to bring the front in-line with the rear, I installed the Works Performance fork springs. As I've already written small novel here, I'll keep it short - EVEN BETTER. My Bonnie is now quite sporty! Well done Works Performance!

(I should include that the rear shocks are Thruxton length - I'm 6'3" and wanted some more height. The steering quickened, but I'm also 225 with full gear, so it's not that noticable, and is something I quite like).
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