New MAC 2-1 exhaust

[tkent02]

Probably. What jets did you use?

 

[incarceration]

I haven't been able to find any let alone order any :\

So the jets are the original jets from before the exhaust\muffler exchange.

I saw you suggested 'Dynojet', where can I find those and which parts\pieces do I need? I remember you saying the 'main jet' but can't remember anything else.

Thanks in advance.

 

[tkent02]

Just order Mikuni jets from Z-1, they are only $2 ea so get a range of them from one step bigger than stock jets to about three. Start with the biggest, work your way down. Plug chops and seat of the pants will tell you when you are there. Then adjust the other carb circuits from the top down. If you are persistant you can get it perfect but it takes time and effort. You may need Dynojet's needle, maybe not.

First step is to read up on how the carbs work and Mikuni's procedure for tuning them.

Don't ride it until you get bigger jets in there, burnt valves are expensive.

 

[incarceration]

I'm looking and don't find my exact model bike in here:
http://www.z1enterprises.com/ShopBy...+GS450+448cc+4-cycle+twin&category=0101040203

Can you help me find the needles I need? Because I don't even see any needles for sale on that site for '82-'83 GS450L model bikes

Lol and what the heck does "...and seat of the pants will tell you when you are there" mean? Btw, I thought to 'plug chop' you had to ride it then cut the engine and pull over and check the plugs? How do I 'plug chop' without riding?

 

[tkent02]

When it runs perfect you will know it. When it won't go over 40mph it's not running right. What I said was don't ride it before you put in bigger jets.
You put in bigger jets, then you ride it. Pay attention to how it runs, and look at the spark plugs. You may not need any needles, maybe just raise them up a tad. I dunno, never tuned a 450. But I have tuned a lot of GSes, some of them with CV carbs.


Do you know what size jets are stock for your bike or what is in it now?
Did you find the 450 tuning reference from Pete? Did you look at the list of stock jetting in the carburetor section?

Just changing the pipe alone it should not be that hard to get the jetting right.

 

[incarceration]

You may not need any needles, maybe just raise them up a tad.

How so?

Do you know what size jets are stock for your bike or what is in it now?
Did you find the 450 tuning reference from Pete? Did you look at the list of stock jetting in the carburetor section?

Just changing the pipe alone it should not be that hard to get the jetting right.

- Do I know what size are stock? No, but I found this info on here that I will post below my responses to this quote.

- Did I find the 450 tuning reference from Pete? I'm assuming you're referring to Pete's response earlier in this thread where he told me to get a dynojet kit? I don't see any place online selling just the "main jet" and "pilot jet".

- Did you look at the list of stock jetting in the carb section? Yes, that's where I found something related to your first question, I believe.


Info found:
US 450 models:
Make: Mikuni
Type: BS34SS
Venturi Size: 34mm (1.34 in)
ID number:
ED: 44400
LD, TXD, LF: 44460
Other models: 44110
Idle Speed:
ED, LD, TXD: 1200 +- 50 RPM
Other Models: 1200 +- 100 RPM
Fuel Level:
ED, LD, TXD, LF: 5.0+- 0.5 mm ( 0.20 +- 0.02 in)
Other Models: 6.5 +- 0.5 mm (0.26 +- 0.02 in)
Float Height:
ED, LD, TXD, LF: 23.0 +- 1.0 mm (0.89 +- 0.04 in)
Other Models: 22.4 +- 1.0 mm (0.88 +- 0.04 in)
Main Jet:
ED: 120
Other Models: 115
Main Air Jet:
ED, LD, TXD, LF: 0.7
Other Models: 0.6
Jet Needle:
ED: 5DX87
LD, TXD, LF: 5CDT60
Other Models: 4C2
Needle Jet:
ED, LD TXD, LF: 0-6 (O-6??)
Other Models: Y-6
Throttle Valve:
LF: 95
Other Models: N/A
Pilot Jet:
ED, LD, TXD, LF: 45
Other Models: 17.5
Bypass:
ED, LD, TXD, LF: 1.0, 0.8, 0.9
Other Models: 0.8
Pilot Outlet:
ED, LD, TXD, LF: 0.7
Other Models: 1.1
Float Valve Seat: 2.0
Starter Jet:
ED, LD, TXD, LF: 32.5
Other Models: 30.0
Pilot Screw Setting:
ED, LD, TXD: Preset (2.0 turns out)
Other models: Preset
Pilot Air Jet:
ED: 135
LD, TXD: 145
LF: N/A
Other Models: 1.6
__________________


Thanks

 

[tkent02]

OK, what jets are in your carburetors now?

 

[incarceration]

As of now I do not know.

How would I find out what they are? Do I have to pull the carbs off?

I have replaced the screws throughout the 2 carbs with allen headed screws, can I remove the float bowl without taking them off and tell you this information?

 

[tkent02]

According to Pete you can.

 

[incarceration]

Ok which jets do you want to know about? And please tell me roughly where they're located because I do not know them by name - I have a Clymer's manual that I can reference the names and locations though. Also, how will I identify the type or specific jet?

Thanks

 

[tkent02]

There is no spoon.

 

[incarceration]

There is no spoon.

?? I'm assuming you're patronizing me inferring 'spoon feeding' but I am trying to get specific information for something I [obviously] am not as informed as the veteran users on here.

I'm trying to get this information so that I can check them tomorrow and report back. If that's not going to happen I will just have to take the carbs off again and report back, in hopes someone else will respond with relevant information.

Thanks for your time.

 

[tkent02]

This should have pics to tell you which jet is which.

http://www.mtsac.edu/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

The main and the pilot are the ones you are concerned with.

there are size numbers on the jets.

 

[incarceration]

Oh ok, so it's the one inside the float bowl and the one next to that one, but underneath a rubber cap.

I'll try and get the information for you tomorrow as, unfortunately I don't have a garage of my own, and it's dark outside.

I can take the float bowls off but I'm not quite sure how I'll get a screwdriver up and under there to take them out, but I'll figure that out tomorrow or in the coming days.

 

[tkent02]

The main jet is easy to reach, the pilot jet may be harder, but you may be able to leave the piot jet as is. Get the main jet right first and see how it runs.

 

[incarceration]

I have some pictures from when I had taken the carbs off and cleaned it a bit.

Are you able to extract the information you're requesting from me from these?

http://imageshack.us/g/694/sv2r.jpg/

 

[tkent02]

Can't make anything out. It would be a stamped number on the flat surface of the jet. That's the main jet though. The pilot jet is under that rubber plug.

 

[incarceration]

Here's another set, with one additional picture:
http://imageshack.us/g/1/10318634/

Not sure if it'll help.

I'll check as soon as I get a chance to take it apart

 

[tkent02]

I can't see the numbers, but I don't see Mikuni's little square symbol either. Maybe some aftermarket jets? Dunno.

 

[incarceration]

So where do I get new ones for around 2 bucks a piece?