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Discussion in 'Thumpers' started by TimberlineAdventure, Mar 29, 2008.
Oh man, that is a beauty, snag it quick!!
Glad to see you got another 500!
so i got the bike
running poorly, very rich
so i am thinking carb rebuild is in order
now i’m stumped
the carb is stamped IT1 60, and i am trying to figure out exactly what kit to get
i figure going back to stock is the best place to start
is that enough information to point me in the right direction?
probably not. put up some detailed pics of it & measure the I.D. of the throat on the engine side. should be 32mm or 34mm
measure the engine side, looks like 1.36 to 1.37 inches.. yeah yeah I know "inches" but that's the dial caliper i have.
so 34.5 mm to 34.75 mm ish?
I emailed the guys at vintage spoke, they reckon it needs this rebuild kit: LINK
all the bits look pretty similar. I just don't want to end up being overly rich still.
of course the jets currently in the carb look like someone used vice grips on them... gnarly, no numbers
I figure going back to stock, or as close as possible, is my best starting point.
anyway, tips and comments appreciated!
I got some of those little ring-stop things (102-25137-00) and fitted the tach cable and the speedo cable.
Looks like the rear brake switch is bad, so that's on the list to replace. Front works though, and brake light / tail light / headlight (hi & low) seems to work OK.
I'd like to put turn signals back on at some point, to make it closer to stock.
need to bolt up the bash plate still (figure out what size bolts holds that puppy on).
oh, and some mirrors.. they look cheap enough on eBay.
looks like the right one, VM34SS stock on 1976 XT500 and TT500
so stupid question...
rebuild kit arriving today.
I have been scouring the web for an exploded parts diagram for the VM34SS, and while I've had pretty good success finding some detailed drawings, none of them mention this little ball. (circled in picture)
I know I had one in my crab, because it was sitting on the towel I laid out while disassembling... of course I didn't see where the little bugger came from.
The ball and spring are the positive stop of the starter lever, means between lever and carburetor body.
Hope this help.
yeah I think i finally found it...
#64 I think
Yes #63 & 64. Don't ask how I know
sounds like you work the same as me.
do it once (wrong) then do it the second time (correctly).
one day I'll get it right first go
so an update to my progress...
The fellow I bought it off had been tinkering with it and said "it's about 70% of the way there".
so anyway.. I get it home and start looking at it. He told me it was running quite rich (black / fluffy spark plug). I confirmed this.
So I figured (right or wrong) that maybe a carb rebuild was in order. I had read about worn needles, etc and figured no biggie.
I got the carb kit from Vintage Spoke for the VM34SS carb that was installed (Carb stamped IT-1 60)
The kit went in easily enough. At the same time I had noticed a bit of a dribble out of the over-flow. A quick scan of the XT forum pointed me to a cracked overflow tube, which I confirmed and repaired with JB Weld and a paint brush (thanks for that tip).
Anyway, carb reinstalled, choke on, fire it up 2nd kick, no worries. Let it warm a bit damn this sucker is loud... can the stock muffler be repacked? It doesn't have its spark arrestor anymore. But I digress...so it's warmed up, and I ease the choke off and it dies.
Bit of choke on, stab it to life, same drill.
so I am a bit stuck right now.
I thought maybe an air leak around the carb intake manifold boot, so with choke on, running about 3000 rpm, I sprayed some WD40 in the area. No change at all.
As I say, it sort of ran OK when I got it (that is to say too rich, but it would idle until the plug got so fouled it said no more).
I am trying to think what I have screwed up, short of putting all the old bits back in. The needle, needle jet & main jet should make no difference to idle. Maybe I need to put the old airscrew back in (with the new pilot jet still installed).
anyway... any help will be greatly appreciated
(pic of the bike, just because)
it has a stock pipe now, and I think the previous guy put the shocks on upside down when he reinstalled (they are opposite of what this picture shows with the adjuster at the bottom). I guess that'd be something else I can work on...
try setting the mixture & idle so that you can ride it until its hot. then adjust the mixture for strongest idle and reset the idle to 1100-1200. also check points gap & timing
sounds like a plan.... but I can’t keep it running w/o choke at the moment
Maybe I try the old pilot jet and air screw?
If that’s a no go then I might try going back to the old bits and see if I can make progress from there
I do need to check points and probably the valves as well just to be sure
If you remove the part #3 on the diagram buy pushing it out and go a small wire from the back small hole of the carburetor, you will free of the opening. That helps sometimes with the problem you are facing.
Sorry fo rmy bad explanation, I am just French
it's OK, your English is better than my high school French
got it running last night. seems like setting up at 1.5 turns of airscrew was too many
I got a good idle and doesnt seem rich (or lean) and 1/4 turn only.
continuing to fiddle.
I need to do the three step carb tuning process next (idle / mid range / wide open)
Cross post from the flea market.
Located in Richmond, VA
1979 XT500 x 2 - Pair of XTs for Sale in Richmond, VA
Would you be willing to part ways with that aluminum swingarm?
Actually already got a request for it.