Continuing Saga of my 2000 M750...

[Javamoose]

After sitting for two years, I took my bike to a local shop and had it all fixed up.  They flushed the water out of the fuel system, filled with fresh gas, replaced the fuel filter, cleaned/rebuilt the carbs (but didn't need to replace any parts, they said).  Also put in a new air filter, timing belts, oil change/filter, brake flush/fluid, clutch flush/fluid, they also did new fork seals/fluid.  Only modifications it has: bypassed vacuum petcock, installed manual petcock, capped unused vac fitting on intake, DanMoto Conical exhausts.

For the first 50-60 miles it was running ok, seemed like a low idle, and a bit rougher than I remember it being...but decent when I got on the throttle (but still not as smooth as I remember).  Shop said the battery had some dead cells, so I bought a new battery and charged it overnight.  Also put in some new NGK plugs (gapped correctly).  Before I put in the new battery, went to go for a ride, when I started it with choke it was really rough and didn't seem to warm up and smooth out.  After a few minutes (maybe 2) I shut the choke and it dropped down into a lopey idle, and stalled.  Starts right back up, will run if I give it throttle, but it hesitates and chuffs, if I chop the throttle, it stalls.  Put in the new battery and new NGK plugs, starts better/faster, but still has the low idle/stall problem.  Not seeing any kinks in the fuel line.  Looks like they disconnected they two vent/return lines that go to the gas tank and forgot to reconnect them, so I hooked them back up (but might have them reversed?).

Any ideas?  I'm not super happy, since I just spent a ton of cash at the shop (and they are supposed to be the best/most reputable shop in town) and it's not running right.

[Howie]

It is not uncommon for a bike plagued with bad fuel to take more than one attempt to get right.  Contaminants can get trapped in the system, fuel pump chambers, low spots in fuel hoses, etc.  Bring the bike back to the folks who did the work.  Also, 2 minutes of choke is a bit much.  You might have fouled your new plugs.

[Javamoose]

It is not uncommon for a bike plagued with bad fuel to take more than one attempt to get right.  Contaminants can get trapped in the system, fuel pump chambers, low spots in fuel hoses, etc.  Bring the bike back to the folks who did the work.  Also, 2 minutes of choke is a bit much.  You might have fouled your new plugs.

I'm likely exaggerating on the choke time, I'll pull the plugs and make sure they're good still though.  They said they ran 6 gal of new fuel through the system to flush everything out. 

I would love to bring it back, but it costs me $60 to trailer it down there, and they have a racing team, so the shop is closed for the next week. 

[Bladecutter]

I would recommend buying and installing a new set of pilot jets in the carbs, and that should resolve the problem.

BC.

[Javamoose]

I would recommend buying and installing a new set of pilot jets in the carbs, and that should resolve the problem.

BC.

Hmm, I specifically mentioned jets/emulsion tubes to them, but they said (when I picked it up) that everything was fine.  The bike has 17,000 miles on it, I hope they aren't bullshitting me, and that they actually pulled the carbs apart...

[koko64]

You have a point on the needle jets for sure and the bike should be running great after all that $$$.

I have seen carbs that were in otherwise great condition with completely blocked slow and main jets. The gunk had to be physically removed with correct size wire as soaking in carb cleaner overnight did nothing. The jets were soaked after the wire cleaning which removed the remaining crud. There is however, the possibility of damaging the jet by being ham fisted or ramming in a large wire or drill bit. Maybe now is the time for Factory Pro needle jets and a jet kit.

The main and slow/pilot jets might be "downsized" with a layer of crud, while your needle jet is ovaled out.
I really hope they didnt just run gas thru the carbs without first pulling them apart and cleaning them. While often works as a first try sometimes nothing less than a carb service/rebuild will do the job.

[SpikeC]

 Those sort of parts can look just fine on a visual inspection, butt that does not mean that they ARE in fact fine.......butt what do I know, I have been injected since 86 or so, except fot the 65 Triumph, and those carbs are just a bit different!

[koko64]

Amals .

[Javamoose]

You have a point on the needle jets for sure and the bike should be running great after all that $$$.

I have seen carbs that were in otherwise great condition with completely blocked slow and main jets. The gunk had to be physically removed with correct size wire as soaking in carb cleaner overnight did nothing. The jets were soaked after the wire cleaning which removed the remaining crud. There is however, the possibility of damaging the jet by being ham fisted or ramming in a large wire or drill bit. Maybe now is the time for Factory Pro needle jets and a jet kit.

Ok, so, I would need the Factory Pro Jet Kit (for each carb?) and a [Factory Pro needle jet (two, one per carb?)[/url], oh, and the O-Rings as well?

The main and slow/pilot jets might be "downsized" with a layer of crud, while your needle jet is ovaled out.
I really hope they didnt just run gas thru the carbs without first pulling them apart and cleaning them. While often works as a first try sometimes nothing less than a carb service/rebuild will do the job.

I really hope they didn't do that as well.  Especially as I paid to have the carbs torn down and rebuilt.  They did get it done suspiciously fast.  Is there any way to confirm a tear-down and cleaning?  Do I have to worry about diaphragms too?

Amals .

Que? 

[koko64]

 One jet kit covers the pair of carbs.
Grab 2 needle jets and 2 little o-rings (just in case you loose them in the tear down). CCW has all those parts, Monsterparts and Motowheels should too. All are sponsors.

Pardon me, I should have quoted Spike C. I was referring to the Amal carbs on Spike C's old Triumph . They're like an ancient, Limey, Dellorto! They work ok.

[SpikeC]

 Monoblocks!!

[koko64]

Monoblocks!!

[memper]

Yet another reason to do your own work. Think of all the tools you could buy with the money spent from a year of shop service fees.

[Javamoose]

Yet another reason to do your own work. Think of all the tools you could buy with the money spent from a year of shop service fees.

I have a full set of tools, more than I would need for the bike.  What I don't have is time, or a garage...

[ducatigirl100]

Heuuuu  .....the carburetor  has been rebuild ...silly question but ..... is the  idle  adjusted correctly ?  

And if you want to rebuilt it     NRP-carbs.co/shop  model KY-0569N   

If you have a  BDST- mukini 38 mm  here you go.... everything you need in one kit  o-rings, jets...everyting!!!!    I've rebuild mine  this year best mood I've done so far