Triumphrat

PTwin

I got new exhaust pipes coming in this week that require a carb rejet. I'm a bit of an amature with wrenching. Is this a job I should do myself, or have a dealer do?

Anyone got a good DIY guide on speedmaster rejet?

JasonSonofEd

http://www.bonnevilleamerica.com/din...ph/carbs1.html

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08 Triumph SpeedMASTER

Lee H

IF you get the jetting wrong you could be replacing/rebuilding the whole engine. Are you comfortable doing this yourself, knowing the consequences of not getting it right?

No matter how good the advise is, or is not, this is something that is best done by professionals or under the supervision of a professional. I even recently saw a tech school graduate really mess a jetting up (we fired him the next day)

JasonSonofEd

Lee what ever dude PTwin get a buddy and follow the link I gave you or if Lee H has you shaking in your boots take it to a shop they will be more then glad to take an easy 200$ from you

http://www.bonnevilleamerica.com/dinqua/index.html

Here is a better good jetting calculator too!

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08 Triumph SpeedMASTER

Lee H

I am not forcing anyone to listen to me... But consider this. Shops like mine do charge extra for redoing customer repairs and mods...and not a single week goes by, when I don't get something that a customer has worked on... Care to venture a guess at how often they got advise from the internet experts?

JasonSonofEd

True Lee H don't get me wrong it could go wrong but he ask for DIY guide ask around most would agree the link I listed is pretty kick butt on

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08 Triumph SpeedMASTER

PTwin

Thanks for the advice guys. That is a really great guide. But for my amateur level of skill it seems like there's a bit too much that can go wrong. I'll probably just do the pipes and have the pros deal with the carb.

Maybe I'll give it a whack next time, when I get a few more skill points in wrenching.

skromfols

PT I think you're making a good decision. While rejetting isn't brain surgery it does require some mechanical skill to get the carbs off. I don't know how far you plan on going with your modifications, but you might want to consider doing away with the air box eventually, which will make changing jets a snap. I'm a far cry from a mechanic, but I've managed to remove my air box and go with pod filters, and now I can rejet in about 30 minutes. You need a decent set of tools, but they're not that expensive, and you probably want to get a set of hex screws to replace the screws that hold your float bowls on. It makes things much easier.

I've found this little twin an easy engine to work on, and when I take my time and think about how to go about it I can do most of the maintenance myself. Lee is right, some things should be left to the professionals, but the more familar you are with your engine the more confident you become and the easier it is to do things yourself.

Just my two cents worth.

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Stan
08 America, Bub slip ons, A/I removed, emissions "stuff" & air box removed, billet intakes, UNI Pods, rejetted, carbs balanced, intminators, Progressive 412's, 1" risers, seat modified by Spencer, TP USA Option 2 Igniter, 813 cams

PTwin

Thanks for the encouragement Stan. I'm just getting started with the mods. But I have obsessive perfectionist tendencies when it comes to my toys/hobbies.... I think after the slip-ons I'm going to focus on minor cosmetic stuff at least until next season. Between my new Prog. 440s and D&D silencers, I'm already an extra grand into this thing.

I am still not totally clear on what advantages are gained by removing the air box. Maybe you could fill me in? I'm assuming it will increase HP a bit, require a rejet and lead to a deeper exhaust note?

So here's a follow-up to that. If my aftermarket silencers required a rejet, and then I removed the air box, how would I figure out what size jets to use?

Lee H

air box removal will have added benefits in Horsepower... in one narrow RPM range.
In order to see a gain in the entire torque curve, there are a lot of other factors to be considered. Everything must be matched up to optimize engine performance. Intake velocity must be matched to jetting, to cam overlap, to the scavenging effect of the exhaust (intake velocity is FAR more important then volume to a street engine. I cannot stress this enough) Then when you get airflow optimized it is time to look at ignition

I am not trying to discourage you. In fact it is quite the opposite...but I am really suggesting that you do some in depth research, first. Then talk to real life bike techs. All engine techs know that most internet experts aren't. Find a tech, in your area, that you can talk to face to face. Ask your questions, and learn about your bike