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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 04-29-2008, 12:09 AM   #1 (permalink)
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New to the Site----hello everyone.
I've been riding Triumphs since 2001 when I purchased a beautiful maroon and silver Bonnie. In 2006 I sold her for a new Scrambler as I was looking for something I could ride to work while riding with my 10 year old son on weekends.

I bought the Scrambler about a year ago and have logged 4k miles on her and just returned from a trip thru the Florida Keys (yea, I wonder why I live in Mississippi).

Now for my question:
I'm running TOR pipes with standard jetting and have removed the stock air box and will replace it with a BC kit hopefully by next weekend. Does anyone have an idea the correct jetting for this particular setup. The mean elevation as around 300' and any help is greatly appreciated. My plan is to up-grade to a big bore kit with a stage one cam kit thereafter.

Mr.T

Last edited by tdipalma; 05-13-2009 at 10:18 PM.
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Old 04-29-2008, 09:09 AM   #2 (permalink)
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When I removed my airbox and used TOR's, I ran 150 mains w/42 pilots 2.5 turns out. I strongly suggest that after you drop the airbox, get some more open pipes. The TOR's are really designed for somewhat restrictive airflow and they work great with UNI filters and a de-snorkled airbox. But to get the full effect of all of the airflow, you'll need some open pipes. I know this probably sounds like a tall order, and it is not at all what I wanted to do with my bike, but someone convinced me of the drawbacks of of the TOR"s and they were absolutely right.
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Old 04-29-2008, 06:08 PM   #3 (permalink)
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I guess it's always something. Could I simply drillout my TOR's?
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Old 04-29-2008, 06:12 PM   #4 (permalink)
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Quote:
Originally Posted by tdipalma View Post
I guess it's always something. Could I simply drillout my TOR's?
There's nothing to drill out. You can see straight through them.
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Old 04-29-2008, 06:13 PM   #5 (permalink)
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Oh, what pipes are you currently running and did you really notice a big (HP in the seat) difference dropping the box? I've read a number of post but most are around the hotter Bonnie motor.

I've also read that Scramblers have different jet sizes (not sure what's coming with the BC kit). Any truth to this?
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Old 04-29-2008, 06:15 PM   #6 (permalink)
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Thanks Pokeyjoe--------guess I would have know that had I removed them!
Mr. T
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Old 04-29-2008, 06:37 PM   #7 (permalink)
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tdipalma, My Scrambler has similar stuff as yours. Air box out and an NB NARK and TOR's. I run 135 mains and 42 pilots. These were what was sent with the airbox removal kit when I described my set up to the folks at New Bonneville, and the jetting seem right. I fiddled with the idle mixture screw for a while and have 'em at 2 turns out. My bike runs great! And since I don't have too many miles on it yet I'm expecting it to run even better once the engine is looser.

I agree with Malibu that hotter exhausts would be ideal, but they're expensive. So for me, one thing at a time. For now, I like the TOR's just fine.

I hope to do the big bore, cam, port and polish and better carbs in the future too, so keep us posted on what you're doing.

*Just remembered, I shimmed the needles too....

Rich

Last edited by rmak; 04-29-2008 at 10:35 PM.
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Old 04-29-2008, 09:53 PM   #8 (permalink)
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I'm running 148 main jets with a FactoryPro needle at the center position. I'm using the BC airbox removal kit w/ Zard hi pipes. I wasn't that impressed with the BC airbox removal kit. There wasn't a place to put the fuse block - so I ended up zip tying it the nearest thing. I would have preferred the oval K&N filters over the round ones. There isn't a lot of room for the round ones. FWIW, I got the most power from changing the exhaust. The airbox kit barely did anything. The dyno results are in my gallery. The three runs correspond to stock, exhaust & exhaust + airbox removal.

I dyno'd the bike with 142 main jets and it was very lean. Thus the move to 148. If you do some web searching you can find an article by Jenks that provides information about the Triumph America and what jets it uses with various mods (engine is same as Scrambler). I haven't been back to the dyno since moving to 148 jets.

Funny that the 360 degree motors with the same mods require smaller main jets.

Quote:
Originally Posted by tdipalma View Post
New to the Site----hello everyone.
I've been riding Triumphs since 2001 when I purchased a beautiful maroon and silver Bonnie. In 2006 I sold her for a new Scrambler as I was looking for something I could ride to work while riding with my 10 year old son on weekends.

I bought the Scrambler about a year ago and have logged 4k miles on her and just returned from a trip thru the Florida Keys (yea, I wonder why I live in Mississippi).

Now for my question:
I'm running TOR pipes with standard jetting and have removed the stock air box and will replace it with a BC kit hopefully by next weekend. Does anyone have an idea the correct jetting for this particular setup. The mean elevation as around 300' and any help is greatly appreciated. My plan is to up-grade to a big bore kit with a stage one cam kit thereafter.

Mr.T
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Old 05-04-2008, 08:59 PM   #9 (permalink)
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air box removed

My BC airbox replacment kit arrived today and I've just finished putting everything back together. A couple of comments for anyone interested.

1. I purchased the kit made for the Scrambler (costs more than the bonnie kit) which has an attachment point for the factory right side cover bracket.

2. BC metal body is very well made

3. Left side mounts have slots for original hardware but reconfigures the actual layout (you will need to unhook a few connectons and move things around but nothing complex).

4 Crankcase breather is chrome and very well made but the connector for the actual breather hose is to small (on the 06 anyway).

5. Kit included a bracket to support carbs

6. Kit did not include jets

7. K&N filters are very nice and fit neatly but they did require that I reroute some wiring (nothing major). Tight fit and you have to move the clamp srcews around to find just the right spot for them.

8. There were no instructions --------not that it's difficult to install but you would think for $350 bucks you would get something. If nothing else kind of an order of things. One example is to install the right side K&N prior to mounting the right side bracket. Or you can just do as I did and take it back off........

I plan to have the jetting dialed in next week and will provide a follow-up.

Mr. T
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Old 06-01-2008, 12:35 PM   #10 (permalink)
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unleash the Beast

Follow-up report on the box removal.

Kit installation completed. Running 140 mains with 42 pilot. No dead spots runs great hot or cold. WOW!--------now the Scrambler is the real deal. Sounds mean, noticable in-the-seat power gain and worth every dime.

I believe I can skip the big bore kit.

Mr. T
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