Triumphrat

TrOjAnUK

First, Hello to all.. I have had my 05 Speedmaster for 3 weeks now, came over from a Suzuki M800 (m50 in the usa) and am loving every minute of it.

OK, in the 2 years I had my M800 I modded it a lot, the standard things, exhausts cutting air filter etc, and if Im honest it didnt really make a whole lot of difference.

Now Im on the Speedy Im reading about jets, shimming cutting the air box etc etc.

I have the Triumph off road exhausts on, the short slash cut ones (much louder) and am now looking into the best route to go for that extra bit.

My friend has a Bony which he changed the ignition cpu so the rev limiter now cuts in at 8400 rpm, is this something that can be done on the sm? is it worth it?

The air filter system that replaces the whole airbox with 2 x K&N and maintains the outter look of the bike seems interesting, I assume if I go that route then new jets / needles will be required.

Theres a big bore kit on the net, 988cc, is this the way to go?? for maximum get up and go or would the special camshafts be a better option?

Ideally Im after as much ooomph for the best value.

If I go the el cheapo way and just change the standard air filter with the K&N and cut the airbox and then rejet whats the average gain I could expect.

The engine atm pulls up to 110mph pretty smartly, would I get faster acceleration or would I get a higher top end speed?

Thanks for any info you people can give me, Ill take all ideas on board..

Cheers, TrOjAn

dazco

There are no ignition boxes to raise the limiter on these, only for the 360 degree engine. (bonnie, thruxton)
You can get up to i'd say 10 HP via pipes, airbox mods and jetting. Maybe a bit more by eliminating the airbox. The TORs you have tho may not get you as much, as they are more restrictive than say thunderbike pipes and others. Then again yours being the shorties, that may not be the case, i dunno.

You WILL need to rejet if you do any airbox mods otherwise theres no sense in it. You are allowing more air for the sole purpose of being able to also add more fuel for a bigger mixture and more power. If you don't reject theres no sense in air mods and all you'd be doing is leaning the mix out to a dangerous degree.

The 988 is a stroker kit, so theres much work to be done, not just installing a top end. The 904 is what most do because it requires no crank or case work. And while only a few CCs more, it's the higher compression ratio that gets you the extra grunt. IMO the best bang for the buck would be the BB and airbox mods/rejet with pipes.

You'll gain acelleration mainly, but you may get a few extra top end MPH, but what gopod is that really?

__________________
2005 Speedmaster, Neon Blue, Thunderbike pipes, snorkel removed, UNI filter, drilled airbox, 130 mains, TBS needles.(2 shims) And speaking of Speedmasters, HERE'S MINE

TrOjAnUK

dazco,

Thanks for the reply, sorta what I thought.. but nice to compare.

Looks like Ill either go for the K&N + Airbox cutting about with a rejet or the FREAK kit + rejet.

Ta for your help, TrOjAn

BorgCymru

I was looking at the 'Freak Kit' but being a spanner thrower I was thinking of just getting some K&Ns from M&Ps and some jets for my jet supliers and doing the job myself, I'm also sure the carb needle shims can be got if I knew the thickness of them.

TrOjAnUK

BorgCymru

Interesting.. let me know what you end up doing, if you get the K&N will it be a single or double? if its a double what will you do about the side casings? with the FREAK it all looks standard.

What exhaust are you running?

I was looking at the K&N replacement and jet kit from newspeedmaster.com as the price is good... if I dont get hammered for TAX <spit>

TrOjAn

dazco

They're .5 mm. I've found washers at hardware stores that work. And of course they don't have to be exactly .5. I've used some that are about .75. It all about how much you need to bring the needles up. One 1mm instead of two .5's, etc. Just get ones with a diameter of the washer and the hole that are close enough.

[ This message was edited by: dazco on 2007-06-27 09:15 ]

__________________
2005 Speedmaster, Neon Blue, Thunderbike pipes, snorkel removed, UNI filter, drilled airbox, 130 mains, TBS needles.(2 shims) And speaking of Speedmasters, HERE'S MINE

TrOjAnUK

OK, heres a dumb question but Ill ask it anyway, Surely adding a shim, lifting the needle, is like making the mixture richer?

Why dont you just adjust the mixture at the carb? or am I missing the obvious.

Anyway, with these TOR exhausts, the short ones, if I add a UNI filter OR K&N filter and hack the airbox about to get more air in how the hell do you know what to do next?

Shimming the needle, is that the same as NOT shimming the needle but adding a BIGGER jet?

Im a little confused here.... shimming and jetting or one or the other.. me head hurts.

TrOjAn

badrufus

I think it might help clear up some of your confusion if you read these:
Jenks Tuning Guide
Pat's Carb Instructions for the Speedmaster
Keihin CVK Carb
The needle and the main jet overlap but function at different times. Once you understand what the needle does (therefore what a shim might do) versus what the main jet does, it should be clearer. On the Jenks site, scroll down the the "link" and it will get you to the pdf, which you can print out.

__________________
2005 T100

TrOjAnUK

badrufus,

Thanks for the links, Ill go off and read up.. yu gotta love the internet... all this info

TrOjAn

BorgCymru

well at the moment I'm running the America slash cuts on my Speedy. I have drilled out the rear baffle and will put a 13mm hole on the plate of the second one for now.

I do want to change them altogether for some slip on custom ones.

Which will mean me adjusting the jets and needles.

Also I've removed the snorkel but I might replace it as I've seen or heard of no benefit until the rest is done.

As for double or single air filter I will have to have a look at the air box and what it bolts to and carries and think about that.