Gas smell in oil

For bench syncing, just set all four butterflies to the point where the cover half of the hole at the top.

if you’re playing with idle rpms, you’re already running.... which past bench syncing

 

Personally, I’d get the correct seals....I know other people have luck with the O-rings, but I prefer the correct seals.

Check to make sure all four of your vacuum ports are sealed well

 

@Glen F. I dont do over the mail work, but I highlty suggest you send them to @hogfiddles to get them serviced, and inspected. Im more than confident if there is a base thats cracked or any issues he will find them.

 

Do these look correct?

 

not exactly sure what your refering to, but from what I can see yes,

 

Sorry, those are the vacuum ports to sync the carbs. Just looking for anything right about now.

 

whats the hose on #3 ?

 

That goes the the petcock

 

Could that be a cause for vacuum leaks?

 

ok, should not matter much, but its typically on #2. (your petcock vacume hose)

you used the o ring method for the shafts correct.. when you use alternative methods, theres always a chance it doesn't work properly. im going to say yes it can, however we have been working on the asumption that you had ruled this out, by saying the propane test passed..... how did you do the propane test, was the carbs connected to the airbox, or were they open faced (no air box boots connected).
was it ideling.. etc ?

 

I had the bike running at idle. Turned the gas on (not lit) and pointed it towards all the intake boots, and anywhere I could get to on the carbs that I had replaced parts. Nothing changed when I did this. I'm going to order the throttle seals from Len. Guess I might be one of the ones that didn't have success with o rings.

 

ok, sounds like it passed then, so your o rings are working...Im currently using double o rings in my fathers 550 as well.
had a delay in getting new intake boots, so not known at this point if it will work for the longterm.

I would always encourage an OEM part on an OEM engine. so sounds like a decent enough starting point.

 

I'm still going to order new shaft seals. I'm just not trusting the o rings. What else could cause a vacuum leak and where would I look?

 

where the intake boots bolt to the cylinder head, remove them and incpect boots and cylinder port walls for cracks.
if all looks good, I can tell you how to guarantee they dont leak there.

Inspect the boot mating surfaces for areas where there is no contact. they are larger in diameter than the ports are, so you should see a clear "imprint" (slight recess) indication all the way around the boot surface.

 

Guessing an impact gun would be best for that.

 

NOOO!!! lol.. only hand tighten them with 1/4" or 3/8' ratchet and use the silver
(aluminum oxide) anti-seize

 

To remove them. Sorry

 

nope, same tool to remove. any air powered tools can damage the threads in the head. bolts are steel, to fast of a rotation can spin the aluminum threads right out.

 

Got it!

 

inspect those intake boots close and only take them off if you really feel the need to
there's 8 bolts on them, if one snaps, your in a bucket of shit with both feet