repoman
Member
Reged: 03/28/12
Posts: 75
Loc: Kinderhook, NY USA
|
|
Here's my question in a nutshell:
My 2002 BA was purchased with airbox replaced with filters.
I have major popping mostly on deceleration and some backfire (which I can't pin point when exactly this happens)
My top speed is about 75 mph, when I hit that mark she just wants to stop accelerating. I can hold it wide open and nothing.
Triumph shop I go to in Hyde Park, NY( he works on Triumphs exclusively and also sells them) tells me it's the air filters and recommends putting the factory airbox back on.
I have no problem doing this since I kind of want an "original" look anyway, but did any of you folks deal with this situation after an airbox mod.?
|
B02S4
Learned Hand
Reged: 02/28/08
Posts: 1543
Loc: USA
|
|
I'm sorry to say this, however your service tech told you that then he is an idiot. Your bike simply isn't tuned properly for the pods. I suggest that you take it elsewhere.
|
repoman
Member
Reged: 03/28/12
Posts: 75
Loc: Kinderhook, NY USA
|
|
Quote:
I'm sorry to say this, however your service tech told you that then he is an idiot. Your bike simply isn't tuned properly for the pods. I suggest that you take it elsewhere.
So, we're talking about rejetting the carbs?
|
B02S4
Learned Hand
Reged: 02/28/08
Posts: 1543
Loc: USA
|
|
Yes, & possibly changing or shimming the needles, & checking/adjusting the float heights, at a minimum.
|
Gregger
Oil Expert
Reged: 04/07/07
Posts: 2372
Loc: Timmins, Ontario
|
|
Pat,
Your bike is set up way too lean. When the pod filters were installed, the jetting should have been changed. If you cannot go over 75MPH you are damaging your engine. Switching back to the original air box will solve the problem since the dealer will have a starting point to work from. They will charge you to install the box and install/verify the stock jetting.
If I were you, I would leave the pod filters in place. If you have high flow exhaust pipes (anything other than stock), you should be able to install the proper jets yourself. Look in the tech vault for jetting options. I would try 145 to 155 main jets and at least install 1 or 2 shims under your stock needles. Open up the idle mixture screws to a rich setting (3 turns). You could also install 45 pilot jets but I would try that after the other changes. Jets are cheap. Fast Eddy sells main and pilot jets. If you check his site, he sells them separately also.
One quick test I have used is to accelerate in 3rd or 4th and while accelerating through around 6000 rpm (anything over 5000 rpm to make sure you are using the main jets) back off on the throttle a bit. If the bike seems to want to accelerate, the mains are too small and should be increased. The opposite is also true. Better yet, if you can get to a dyno and have someone set up the bike, you will be amazed with the performance increase.
One last point and maybe I should have posted this first, was the bike always like this or did it just start to show these symptoms? If it is a recent problem, check the intake rubbers and vacuum caps for cracks. You could be sucking air in leaning out the fuel air mixture. 
--------------------
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
|
edmspeedmaster
Learned Hand
Reged: 07/11/11
Posts: 1248
Loc: Alberta, Canada
|
|
you might want to list any other mods, what pipes are you using, are the filters actually pods and if so which ones? What exhaust are you using? Baffles removed? changing the jets is not to tuff and even tuning for a decent ride not to tough either but dyno would be the way to go for a true sense of where you are at. So long as the correct jets (pilots and mains) are being used you remove the risk of running way to lien etc.
--------------------
2007 Speedmaster and lovin it!
In Memory of "Friar John" 1967-2012 RIP
|
The_Dog33
Fe Butt
Reged: 02/01/07
Posts: 17007
Loc: NE PA USA
|
|
I agree , I would find a shop that actually knows how to work on bikes not just bolt oem stuff back where it was in the first place. There is a difference between knowing about the way bikes work and being able to simply bolt things on. I would go with 145 to 155 mains and 42 to 48 pilots (both depending on exactly where you live and what you have on there for exhaust) The gains in performance are worth the effort rather than putting the air box back on.
--------------------
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
some shots of our bikes
|
repoman
Member
Reged: 03/28/12
Posts: 75
Loc: Kinderhook, NY USA
|
|
To answer a couple questions you guys threw out there:
I'm fairly certain it has been performing like this from day one when I brought it home.
Can you tell from this picture if the pipes are stock? I believe they are.
Also, are these K&N filters? again, I believe they are.
I know you guys are saying no big deal adjusting these carbs, but that is way over my head at the moment.
I'm going to look for a mechanic/tech that can go through this and straighten me out.
What kind of damage am I doing running this way? (I'm starting to get bummed out here.....)
|
edmspeedmaster
Learned Hand
Reged: 07/11/11
Posts: 1248
Loc: Alberta, Canada
|
|
thats a nice lookin bike, and those appear to be Short TORS you have on there, not factory. Nice sounding little pipe, they are marginally more open then the OEM pipes, factory Pilot (should be 42's) with the pods and TORS should be ok but you will likley require to step up to at least 148 mains+ to bad you don't know whats in there, but i suspect with the issue you are having if its jet related you have 120's or so in there now. I don't see any major bluing on your pipes likley becasue you are not running 75mph very often. I would have them step up on the mains, or at the very least find out what you have in there.
--------------------
2007 Speedmaster and lovin it!
In Memory of "Friar John" 1967-2012 RIP
|
repoman
Member
Reged: 03/28/12
Posts: 75
Loc: Kinderhook, NY USA
|
|
Thanks for all the comments so far guys, they are a huge help.
A friend just recommended a performance shop not too far from me that has a Dynojet 250i Dynamometer service. I just got off the phone with one of the mechanics. He says he can order a jet kit if needed after they check it out.
So we have to find out what jets are in there now.... 120s seems to be the best guess.
Should I tell him I might need 145 to 155 mains, 45 pilot jets? Would he already have that information (being the ace mechanic I think/hope he is)? Or is it up to the owner of the bike to tell these guys what they want?
This is the first time I've brought a bike in for this type work so I'm not sure what to expect.
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
