Triumphrat

19554

Hi Triumpheteer's
I posted last week for words of wisdom before I modded my 865 T100.
Recieved lots of info and finally decided on TOR's, jenks bellmouth,unifilter, 125 mains and 3mm hole, but then amanger advised me not to drill if I'm not fitting pods.
So the question is should I drill, as there's no going back if I do!

steve
always look on the bright side of life.................

webonnielad

If you look at my signature (ok it's for a 790cc) it's very similar and it worked big time for me.
Make sure you've got a new drill bit and tha you fully centred and square on the hole. I used a pillar drill.
Your not drilling another hole your just making the existing hole 0.5 of a mm bigger in circcumforance.
Take it nice and esay as the metals very soft and keep the diaphrams well out of the way.

Falling that bike bandit sell the slide assembley with 3mm holes.

Look at part 6 on the schemeatic and scroll down to the price list, don't forget you'll need 2.

http://houseofmotorcycles.bikebandit...00/All/2291022

All the best

Jon (UK)

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790cc 2003 T100 Bonneville. 18T Front Sprocket, AI Removed, 125 Mains, 40 Pilots, Thruxton Needles, 1 Shim,3mm Air Hole, Mixture screws 3 1/4 turns out left carb, 3 turns out right carb, Unifilter, NH Belmouth, NH Classic Togas with no mutes inserted, Stock Ignitor Unit. Hagon 320mm rear shocks & progressive fork springs. Last measured. 61.60 hp, , Max torque 48.40 in 5th gear at the rear wheel at 7200 rpm, 105 mph in 5th at 6500 rpm.

TheBoatDude

I'm incredibly new to a) Motorcycles and b) Triumphs, so I apologize if this is an elementary question: What is this operation your referring to and what is it expected to do? I figure it is something to do with drilling a larger hole in a carburetor and fitting some sort of sliding mechanism, but that's where my technical knowledge dries up.

Thankx,

TBD

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Gohm

It is enlarging the hole in the vacuum slide of the carb. It improves throttle response. You can do it at any point. You can either drill out the current hole larger to the correct size (offset vacuum hole, not the needle hole in the center!) or drill a second hole to equal size it total. If you do not like it, you can either replace the slide or fill in the hole and go back to stock size. there's some pix in my album for reference if you like.

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stu

I have to be honest and say I didn't notice the least difference after the drilling.
You do have the potential to mess up the slide though. You could also shorten the spring a couple of turns to get the same effect.

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Stu


TORs, NARK, thruxton needles, 140mains.40 pilots 2.75 turns out, procom igniter, 17T

JimSouba

I have an 07 bonnie with the 865 motor. I'm running TOR's, 118 mains, 3 turns, uni-filter, and the polaris bellmouth. The AI system and smog cannisters are gone. I drilled my slides to nearly 3 mm (7/64 inch bit), and didn't notice any change whatsoever. I've since removed the divider / restrictor plate in the air box, and what a huge difference that made! I've never done a dyno test, but now the tach shoots up when you twist the throttle like never before. The intake roar sound is also awesome now, the low end is still great, and my gas mileage is still in the high 40's (and occasionally in the low 50's).

My bike may be a little lean, but I'm having it checked on a dyno soon. I'm at 4000 feet altitude, which favors lean jetting. The needle in the carb on these 865 motors seems to be tremendously flexible, and you can use much smaller jets than with the 790 carb needle.

Based on my experience with the same motor and pipes, I wouldn't be afraid to drill the slides. Just don't expect any huge changes until that motor can really breath on the intake side.

Good luck!

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Jim

2007 Bonnie Green. 865 cc motor with AI, emissions cannisters and airbox gone. NARK, 138/40 jets, 3 turns, 1 shim, slides drilled to 3mm. TORS, K/Q seat, sissy bar, 19T, and Parabellum windsceen.