Topic: Rejet or re-stock stock air box?

[Johnny5]

Hey Ron,

Tomorrow when you find out what mains you have and if they are the stock size, go to Z1enterprises and order a couple different sets a couple sizes bigger. The main jets are rather cheap so it's wise to just buy a couple sets. I'll come down and help you tune the carbs next weekend. We can also go through the whole tuneup.

[ron.cieri.313]

Z1?...thats good cuz I've ordered from them b4

Just pulled the main jet on carb #1...survey says, "105"

I haven't read the other rejetting posts on the site but that sounds a too small for pods from what I'm hearing.

(John...also have ordered new adapters for the Morgan which should be here in a week or so)

[Johnny5]

There's your issue. Im surprised the bike ran at all. It's probably getting hot(Lean) from lack of fuel after you ride it for a few miles.

Order (4) 115 mains and (4) 120 mains. Here's the Z1 part numbers: 120 main (KL18-4524-1) and 115 main (KL18-4522-1)

Let me know when they are in and we'll get that bike roaring.

[Sporkfly]

Let's see, I'm having a similar idle problem. The difference is my bike doesn't die. '77 550

Running:

Pods
105 main jets
Idle mixture screws 2 1/4 turns out (if I recall correctly)
Needles at third clip (stock is 2 on my carbs)
Runs better when it's damp out ( )
Custom exhaust baffles

I have nothing at WOT, my idle needs adjustment at lights, and I can only get it past 75/80mph when it's damp out. My plugs were fairly white at the ceramic and the electrode was a nice tan. Thread face looked good. The way I read that is lean WOT, timing is right, idle is good. I think I may as well just go back to the stock air box though if I can get all the parts.

[TwoTired]

Let's see, I'm having a similar idle problem. The difference is my bike doesn't die. '77 550

Running:

Pods
105 main jets
Idle mixture screws 2 1/4 turns out (if I recall correctly)
Needles at third clip (stock is 2 on my carbs)
Runs better when it's damp out ( )
Custom exhaust baffles

I have nothing at WOT, my idle needs adjustment at lights, and I can only get it past 75/80mph when it's damp out. My plugs were fairly white at the ceramic and the electrode was a nice tan. Thread face looked good. The way I read that is lean WOT, timing is right, idle is good. I think I may as well just go back to the stock air box though if I can get all the parts.

Here's my armchair analysis:  Still too lean.

White at ceramic is no deposits.  The enviros will hug you.
http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

Of course, your report is a composite reading, of idle jet, throttle valve needle, and mains mixture reading.  Could be rich on some and lean on others.

Usually, rain means a low pressure area moving through.  Low pressure = slightly less oxygen.  If you have too little fuel for standard pressure, you might have better mixture balance when a low pressure area moves through your area, hence more power.

You could duct tape half the pod outer face to prove the theory.  This should deepen the carb throat vacuum and pull more fuel from the jets at existing settings.
Or, you could try to add a little choke and see if the power gets a little better.

I like the stock air box. 

Cheers,

[ron.cieri.313]

Well, I ordered 120's and 125's...115 appear to be harder to get...out of stock at BikeBandit and Z1...anybody got some extra's lying around they want to sell or know another source?...thanks!...ron.

[ron.cieri.313]

Fyi..found some 115 on ebay...let the trial and error begin...will let everyone know how it goes...thanks....ron.

[ron.cieri.313]

Just a quick update...I reassembled the jets (the 105's I found in there) and took the bike for a ride...25 miles and no konking out but she does sputter and times and still fiddling with idle setting screw (but not as much as I mentioned before)...so, it does seem like cleaning the gas tank cap helped but gas/air mixture as others speculated still a problem.

When I returned home, I looked in my mailbox and there is my package from Z1 with some new jets...here we go again!...will let you all know...thx...ron.

[ron.cieri.313]

Okay, now I'm up to 125's (from 105 to 115 to 120) and she's never run better but still stutters just a bit when throttle is twisted but no more stalling after 6-8 miles, and idle adjustments during a trip are minimal. 

I'm going to order and try 130's.

I couldn't change my needles adjustments cause those damn little screws are rusted tight...guess I could soak, etc...if anybody has any suggestions on these little buggers let me know.

I still have to keep the air idle screws completely closed with 125's.

thanks all.