Exceptionally poor MPG

[Big T]

Okay

Let's start with carbs
When you say you rebuilt them, did you follow the tutorial here? New O rings? Carb rebuild kits?


Ignition
You need both sets of points, both. Condensors that are properly gapped and timed with a timi g light

These bikes are pretty simple. Go to Bass cliffs site, download the factory service manual and read the tutorials

 

[Steve]

You need both sets of points, both. Condensors that are properly gapped and timed with a timi g light

I do believe that I have missed the tutorial on how to gap and time the condensors. :-\\\

.

 

[Big T]

Steve, some days I use my $60 tablet and that's the best I can do

 

[Steve]

How do you use your $60 tablet to gap and time the condensors? :-k

Sorry, but the logic in your reply eludes me.

.

 

[JTGS850GL]

Steve, you need to back off on the extra cups of coffee. Posting mistakes can happen and it's no reason to be unnecessarily rude. Big T obviously meant to say, buy new points and condensers and THEN re-gap and reset the timing. Or at least I was brilliant enough to understand that.

 

[dpep]

I didn't see any mention of the carb boots or air filter boots being checked or replaced.

I also don't know what is meant by "rebuilt the air box." But you do want to make sure it is properly sealed along with the boot connections.

I strongly suspect that your non oem exhaust is involved in your problem. In my experience stock jetting and stock air box do not play well with after market exhausts, particularly on the 8 valves. if you could find a stock exhaust (good luck) and take everything back to baseline, I would do that. Otherwise search here for the recommended jetting for the exhaust you have and possibly consider pods if they are recommended. Expect a fair amount of trial and error and tweaking. Just about any change you make to the stock setup will reduce your gas mileage somewhat.
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[Guest]

I Agree with Steve, "IT'S TIME FOR A COMPLETE STRIP AND DIP REBUILD" I have been there on all sides of the rebuild theories and I know that only one way works with VM carburetors, at least a 24 hour soak in carburetor dip completely disassembled, new O-rings, floats adjusted and fuel levels checked, and most likely new boots and O-rings to the head. In your case the air box needs to be properly sealed also. I am running 4-1 pipes and pods, a stage 3 jet kit and regularly get 44 MPG on a GS1000E. There are extremely tiny passages in these carburetors, and 30+ years of hardened crud can not be cleaned with carburetor cleaner in a spray can even if you see some spraying through the passages. Spray carb cleaner is a final step along with compressed air. Then the adjustment process begins.