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Message started by sparkett on 12/02/06 at 17:09:37

Title: Poor gas milage
Post by sparkett on 12/02/06 at 17:09:37

Have just rebuilt 87 savage, new cam chain, cam, reset valves to spec. cleaned carb(155 jet) full spacer, no backfire with dyna muff. Problem is bike now gets only 30 miles per gallon. Air fuel screw set at 2 1/2 turns out. Any ideas on why milage dropped to 30 from 50 before tear down and rebuild?

Title: Re: Poor gas milage
Post by justin_o_guy on 12/02/06 at 17:44:58

If I had this problem I would consider going back to stock carb & exhaust. Then make small changes & watch the MPG. But, there are some smart guys here with a lot of experience that may just up & tell ya what's wrong. I will watch & see if you get that lucky.

Title: Re: Poor gas milage
Post by Brewbrother on 12/02/06 at 17:48:22

sparkett wrote:

first few simple things that come to mind are dirty air fliter or fouled plug. what pilot jet did you use??

Title: Re: Poor gas milage
Post by sparkett on 12/02/06 at 18:46:14

went one hotter on the plug, brand new cone filter.carb just broke down-cleaned-reassembled. befor the cam chain went it had the diaphram removed and the vac port on carb capped.took her for a ride today. 90 miles, she smothed out but is really blowing carbon, brake adjuster is jet black and she was just detailed.Harley muffler and 155 jet.

Title: Re: Poor gas milage
Post by Brewbrother on 12/02/06 at 22:21:08

sparkett wrote:

Title: Re: Poor gas milage
Post by Brewbrother on 12/02/06 at 22:22:46

you are obviously runing rich. Black brake adjuster says it all.

Title: Re: Poor gas milage
Post by Rockin_John on 12/03/06 at 00:04:42

Brewbrother wrote:

you are obviously runing rich. Black brake adjuster says it all.

If it got the brake adjuster very black in 90 miles, I'd up that to VERY rich.

Title: Re: Poor gas milage
Post by sparkett on 12/03/06 at 05:25:28

turned air fuel mix scew to 2 turns out.still some smoke,
how do i tell the size of the pilot jet?any other tricks this girl can try?its a mikuni carb, guessing original. needle valve was totaly gooie, got it clean.when i finally got it out (clymer book is wrong) lol pushes in to the center not follows the screw and washer! lol

Title: Re: Poor gas milage
Post by Max_Morley on 12/03/06 at 10:00:54

If the carb was "gooie" I' consider removing and double checking all the carburetor air bleeds. They are above the fuel level and have to be clear to start the atomization process. If they are even partially plugged, it will cause that circuit in the carb to run rich. I've found that a product call 'Sea Foam' works very well as a maintenance item for the fuel system -it increased my mileage about 5 mpg- and it is a fuel stabilizer for winter storage or little use times. I'd recommend running it through your last run tank of fuel and then adding the recommended amountat storage. Max

Title: Re: Poor gas milage
Post by sparkett on 12/04/06 at 03:46:47

Found the "sea foam" put it in and rode the 22 miles home. cleaned up the garage, . now it backfires each time the clutch is pulled in! is this a good sign?

Title: Re: Poor gas milage
Post by azjay on 12/04/06 at 07:34:22

it may imply that the carb is cleaning out, and the engine is starting to lean out a bit (a good thing). were you running the 155 main jet prior the rebuild? i've seen it reported that too large a main jet simply caused worsened gas mileage. debby has gotten 35mpg with her bike jetted with a 155, 2/3 spacer, dyna muff, but that was running 70mph into a 30mph headwind for 1.5 hours.

Title: Re: Poor gas milage
Post by Dynobob on 12/04/06 at 20:49:52

Give the SeaFoam more time to work. I'd use it for a couple tanks before I drew any conclusions. If you did notice a difference in the way it runs, that is a good thing. It can only get better.

Title: Re: Poor gas milage
Post by Dynobob on 12/04/06 at 20:53:08

Oh one more simple thing to try - there's a drain plug on the bottom of the float bowl. If you can turn it (it's not frozen up) counterclockwise, drain the bowl. This will flush out alot of junk that usually ends up in the bottom of the bowl.

Title: Re: Poor gas milage
Post by sparkett on 12/06/06 at 03:37:09

Hi! and thanks. she is running a lot better! leaned her up a fuzzy ( brownish smoke) and 60 right now!! just one small oil leak to fix and she will be a perfect lady!