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Dented header and exhaust question

  • Thread starter Thread starter adam kinmond
  • Start date Start date
A

adam kinmond

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can someone here have a look at the pics and let me know your thoughts. the header is smashed up pretty good, wondering if i should repair or replace? i dont think it will affect overall performance. not sure what the previous owner put on as far as exhaust pipes but im sure im in need of a jetting change. im sure the carb is all stock, bike runs well up to 7000rpm then flutters the rest of the way up. i have on the stock airbox. i am in the process of adjusting the valves and replacing orings for carb manifolds and carbs. while im into the carbs i was thinking of going up a size in the mains moving the needle jet down a notch? i pulled the plugs after a ride and they were slightly on the lean side. i know i got some work to do but i would like to know thoughts on the exhaust setup. thanks
 
heres the 3rd pic, sorry, but this is the only way i know how to put up more than one pic.
 
Replace. You should be able to find the inner pipe with ease, either here or on FleaBay.
 
Use a photo hosting site like Photobucket or, heaven forbid, imageshack. You can post up to ten photos per thread. See Basscliff's site for instructions.
 
It looks to me like a boom tube welded to the stock header. Lean :-\\\ no wonder, it is straight through without restriction except from the dented header.;)
 
just wondering if i should change the main jet size up a size when i have the carbs off? really need some help
 
Won't know until you get the thing back on the road (or dyno if you could be so lucky) as it will need to be sorted, depending on what you decide to do with the exhaust.
 
thanks for the help. I will have to aquire such a tool. anyone know the id of the header pipe is on a 550LZ?
Looks like the real hard part of this project will be taking the headers off. I guess i better start spraying with liquid wrench:)

Anyone got ideas for jetting, dont think i need needles just a few sizes up on mains. stock i believe is
Mikuni N100.604 Large Round Main Jet
9mm in length with a 8mm Round Head
size 92.5.

I would like to get right the first time was thinking 95 or 97.5 or ever 100. the needle jet should have the notches, so making it a notch or two richer will be no problem. these carbs are a pain to remove and repalce.

I wish there was a "jet club" like the shim club.
 
you will not get it right first time, it is a case of trial and error. you need to RAISE the needles to richen the mixture
 
Need header ID

Need header ID

If anyone knows the id of the stock header, i would appreciate it. i will be making a tool based on texasgs design. i would like to have the tool made before i take the exhaust off so there will be less downtime. just need to know the size of ball bearing to buy to shove up the header.
 
Agemax said:
you will not get it right first time, it is a case of trial and error. you need to RAISE the needles to richen the mixture
Click to expand...
There are times where we can suggest jet sizes, but those suggestions would be based on experience.
For example: with stock airbox and XXX header, go this many sizes larger. For pods and a header, go that many sizes.

You mentioned that you have the stock airbox, but those pipes are another matter.
They sort of appear to be rather free-flowing, but what's that thing that is stuck in there?



There is simply no way to tell how much the air flow is hindered by that device, so jetting will definitely have to be trial and error.

Agemax has it right, you will need to RAISE your needle. Normally, you would lower the clip to raise the needle (it has a spring that pushes it UP, against a stop), but your needles don't have but one groove for the clip. The good news is that there is a thick nylon spacer above the clip. Remove the spacer and replace it with a couple of thinner metal washers to raise the needle. The washer assortment at Radio Shack is a favorite source. Just use the smallest washers in there. Four washers are about the thickness of the nylon spacer, so start with two washers to raise the needle.

.
 
Jet Club??

Jet Club??

adam kinmond said:
I wish there was a "jet club" like the shim club.
Click to expand...

Adjusting the jetting is kind of like adjusting artillery fire - you got to keep adjusting it until you finally zero in on the target. Unless of course you happen to be one of the "gifted" ones who can get it right with one adjustment. And if you have to adjust all five components (mains, pilot, needles, needle jet, and air bleeds) multiple times it gets real expensive real quick! :eek:

I think that is a GREAT idea! Dialing in my RS36's took a couple of adjustments to the pilot, needles and mains until I got it to where the engine was happy. Wasn't cheap either, spent about $140 on jets and needles!:(
 
Steve said:
There are times where we can suggest jet sizes, but those suggestions would be based on experience.
For example: with stock airbox and XXX header, go this many sizes larger. For pods and a header, go that many sizes.

You mentioned that you have the stock airbox, but those pipes are another matter.
They sort of appear to be rather free-flowing, but what's that thing that is stuck in there?



There is simply no way to tell how much the air flow is hindered by that device, so jetting will definitely have to be trial and error.

Agemax has it right, you will need to RAISE your needle. Normally, you would lower the clip to raise the needle (it has a spring that pushes it UP, against a stop), but your needles don't have but one groove for the clip. The good news is that there is a thick nylon spacer above the clip. Remove the spacer and replace it with a couple of thinner metal washers to raise the needle. The washer assortment at Radio Shack is a favorite source. Just use the smallest washers in there. Four washers are about the thickness of the nylon spacer, so start with two washers to raise the needle.

.
Click to expand...

the thing stuck in there is just a chunk of metal bolted through the pipe, its easily removable. i can only imagine that its there for some sort of restriction. since my bike is the canadian version there are 5 groves in the needles. my first wack at jetting is going to be moving the needles to the richest setting and two sizes up on the mains ( 92.5 to 97.5)
 
adam kinmond said:
the thing stuck in there is just a chunk of metal bolted through the pipe, its easily removable. i can only imagine that its there for some sort of restriction. since my bike is the canadian version there are 5 groves in the needles. my first wack at jetting is going to be moving the needles to the richest setting and two sizes up on the mains ( 92.5 to 97.5)
Click to expand...
OK, I missed the part where it would be a Canadian bike. :oops:

Depending how restrictive that "thing" is, two sizes on the jets might get you into the ballpark, don't be surprised if you need to go four or five. :o

.
 
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