xs750 wont run...

[lee_dutcher]

Tryed just about everything. Has all new internals in the carbs. Has good spark. I smell gas....what else.am.I.missing? I mean it doesn't even want to run at all. Pops a little and backfires and that's it. Any help would be much appreciated.
Also cleaned the connectors

[D0wn5h1ft]

Tryed just about everything. Has all new internals in the carbs. Has good spark. I smell gas....what else.am.I.missing? I mean it doesn't even want to run at all. Pops a little and backfires and that's it. Any help would be much appreciated.
Also cleaned the connectors

If it has spark, fuel, and compression then it's your ignition timing. The 750 manual has a procedure to go through to make sure it is set appropriately.

[IanDMacDonald]

I like working on my 750/850's much more than my 11. Smaller seems easier. Pull the plugs and see if they're fouled.

[DGXSER]

If you recently had the coils out, check you got them reconnected correctly. Not sure how they operate on those tripled, but on an 11 it is not uncommon that the coils get hooked back up swapped.

[IanDMacDonald]

Three separate coils on a 750.

[IanDMacDonald]

Literally left to right on each coil to the cylinder. But, just re-reading your first post, does it run, or you cannot get it started? Are you using the enrichener? I believe stock main jets on my 750 with the MKII carbs are 130? Is your timing setup functioning? Crank magneto in-place? Battery good? So many things to guess, with not much info given.

[lee_dutcher]

Battery is new and fully charged the carbs have been cleaned 3 times with all new internals. I never messed with the timing. Any one got a.link.on how to set the timing on it? Yes I'm.using the inrichiner. And yes 140 are the stock mains

[IanDMacDonald]

140? No sir, not stock, unless ur dealing with different carbs. 130 Mikuni mains. And, are u not a member of yamaha-triples.org?

[DGXSER]

After you have tried to start it, have you looked at the plugs? See if they are wet with fuel, or dry? Dry equal no fuel, slightly wet looking, got fuel but no spark at the right time. REALLY wet looking may be to rich of a mixture.

Pull the plugs out one at a time and check for spark by grounding them to the engine and trying to start the bike. Good spark on all three?

Now, assuming you have good compression on all three cylinders. You say you did nothing to change the timing. Did you at any point unplug the coils? Possibly re plug them into the wrong wires?

140 mains when they should be 130 could make the mix to rich to fire.

[BA80]

Mains shouldn't make any difference on startup. If the plugs are fouled or even old it'll act that way. I'm betting some kind of ignition issue.

[lee_dutcher]

Sorry yes there 130 mains is what I meant to type. Yea never unplugged anything except the battery and headlight. Plug are wet but not soaked. They are brand new. Yes I'm sure I have spark. Checked all three and have good strong spark.

[lee_dutcher]

I did just do a starter clutch on it. In involved to remove the whole left side basically...I'm having a feeling sense i rotated the motor to get oil pump gear off i messed the timing up?

[IanDMacDonald]

well, u never said if you have a timing light to check the timing. Basically same premise as the 1100.

[D0wn5h1ft]

well, u never said if you have a timing light to check the timing. Basically same premise as the 1100.

He can't check the timing with a timing light without having the bike running first. Well, I guess you could have crank the bike by hand and see where it flashes at...

[IanDMacDonald]

Touche' I'm wondering if he left the magneto or whatever that's called off the end of the crank, part of the timing assembly.