Triumphrat

dardoonk · 11-22-2005

When I bought my bike, the dealer installed the D&D's I wanted and "rejetted". They gave me a bag with the stock jets & I just threw them in the box along with other stock items I never bothered to put on the bike. I never looked to see what size they were.

As far as I can tell, the bike is running too lean.. The plugs are very white, no brownness at all, "popping" on deceleration has always been there, but since it is colder now & the air is more dense, popping is even worse now. I also pulled the top snorkle and the bike was unridable; as soon as I hit the throttle it nearly stalls. (It's back on for now)

Now, I've opened up the bag of jets the dealer gave me and all that is there is a set of secondarys #42 on them. I haven't been able to speak to anyone at the dealer that can tell me, but it looks to me that they never did anything with the man jets at all. The dealer is too far away to go back to them & I now I prefer to do it myself, but have no idea what starting point.

Can anyone say for sure what jets are on the my bike as it came form the factory? I will be removing the air box soon also, should I do it all at once, or re-jet for the pipes and again when I do the airbox? Any thoughts on what jets' I will need and should I change the needles?

Panthermark · 11-22-2005

The America engine comes with #42's. The Speedmasters with the 865's come with #40's.

dazco · 11-22-2005

manual shows 42 pilots and 120 mains withNBAD needles. So it seems as tho they just upped the pilot jets which is the LAST place they should have gone. The mains and needles must still be stock, and the needles cover the largest range and is where i'd start if i were you. The mains are proably ok at stock for now but when you remove the airbox they'll have jets with the kit that arw WAY bigger and must go in when it's removed. before that you won't need nearly as big on the mains. I would wait till you do the airbox to up the mains. But till then i'd say try shimming the needles. You'll probably find it will give you a good bit of power. Once you do the airbox then install the main jets that come with the freak. Don't know what comes with it as far as needles, but you'll definatly need to add more shims or go to a thinner tapered and shorter needle like a thruxton. (i think it's shorter)

Anyway, i think you'd do best to do the freak right away instead of having to get the jetting right twice. Then just install the jets that come with it and if no needles or shims come with it i'd order some shims and thruxton needles and experiement. And make sure to get the allen head carb screws ! once you do that and remove the float bowls and tops for the needles a time or 2 it'll get quick and easy. then you'll have to just experiment as i said. but it'll happen pretty fast over the course of a few times. seems a bit akward getting your hands in there but only at first.

windrider · 11-22-2005

Quote:

On 2005-11-22 21:31, dardoonk wrote:
When I bought my bike, the dealer installed the D&D's I wanted and "rejetted". They gave me a bag with the stock jets & I just threw them in the box along with other stock items I never bothered to put on the bike. I never looked to see what size they were.

As far as I can tell, the bike is running too lean.. The plugs are very white, no brownness at all, "popping" on deceleration has always been there, but since it is colder now & the air is more dense, popping is even worse now. I also pulled the top snorkle and the bike was unridable; as soon as I hit the throttle it nearly stalls. (It's back on for now)

Now, I've opened up the bag of jets the dealer gave me and all that is there is a set of secondarys #42 on them. I haven't been able to speak to anyone at the dealer that can tell me, but it looks to me that they never did anything with the man jets at all. The dealer is too far away to go back to them & I now I prefer to do it myself, but have no idea what starting point.

Can anyone say for sure what jets are on the my bike as it came form the factory? I will be removing the air box soon also, should I do it all at once, or re-jet for the pipes and again when I do the airbox? Any thoughts on what jets' I will need and should I change the needles?

Why don’t you just try increasing the mixture by turning the mixture screw out a few turns to start with? When I changed my pipes I had serious popping on my Speedmaster and could feel fuel starvation at higher revs. Had a look at the jets 120 main and 40 pilot. Just by increasing the mixture screw it now perfect. No popping backfiring loss of power. I have also removed the snorkel.

dardoonk · 11-23-2005

I got hold of the service manager at the dealer this morning.. He told me when installing D&D's they leave the mains if it has 120's in place and will change them if there are airbox mods. They put 45 pilots in the bike (reccomended for D&D's).. He told me in colder weather to increase the mixture a half turn and see what that does.. If it does not help, adjust the needles, but he thinks the 120's are fine with the factory airbox.

Dealer said some needles have an adjustment on them.. I haven't heard anyone talk about this. If it is there, does anyone use this for needle adjustment rather than shimming them?

Are the Thuxton needles available from the dealer only?

dazco · 11-23-2005

Quote:

Dealer said some needles have an adjustment on them.. I haven't heard anyone talk about this. If it is there, does anyone use this for needle adjustment rather than shimming them?

Are the Thuxton needles available from the dealer only?

Sounds to me like your dealer is maybe not all that experienced on the subject ! Some needles do have clip type needles so you just change the clip position. But he should know that our carbs DON'T. Ours use needles without thie clip position and instead are raised by shimming them, which is just adding small washers to bring the needle up higher in the jet.

The needles are only available at dealers. I've been getting mine from palm beach triumph in florida because they were fine with taking my order, and i wasn't sure how many dealers would bother taking a phone order and go thru all the credit card BS and mail order hassle for such small profit item. But in any case, yea, dealer only. They list for somewhere around $7.50 each if i recall.

dardoonk · 11-23-2005

I spoke to their Service Manager, but looks like that was the wrong guy.. I am sure that someone their knows what is going on though, I just have to find him...

Their Sales Manager won the Thruxton Challenge at Daytona last year, so somebody knows what the heck to do.

Thanks everyone for your imput

RedBird · 11-23-2005

dardoonk,

My dealer's mechanic usually leaves the main jets stock for D&D's on 790cc motors with stock airbox; however, he highly recommends using adjustable needles such as Factory Pro needles--adjustable needles make it much easier to change the midrange settings. I measured the Factory Pro needles and they have the same taper as the Thrux needles as far as I could tell with a dial caliper. That being said, the Factory Pro tune kits sell for close to $100, and the Thrux needles sell for under $15 a pair and shims are very cheap!

I agree with Daz, start with your needles--add a shim or two (that's 0.5mm shims) and see how it responds. When you get through with your modding, I would highly recommend a dyno run to see where you are. When I had my bike dynoed, the tech said he had done an America the week before--it had open exhausts, airbox removed, and Thrux needles. The main jets that worked best for it were 145's. By comparison, my 790 T-100 with a similar setup works best with 158 mains and stock needles with no shims--actually my mid-range is a little rich with the stock needles where most find the stock needles too lean to much too lean.

Larry

SpeedyPete · 11-24-2005

Dardoonk,

I contacted newbonneville.com for thruxton needles and they steered me back to the dealer.

I'd bet real money that the thrux needles are only a dealer part.

Pete

vertwrks · 11-24-2005

If you remove the air injection system that will reduce the popping on decelleration