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Hard starting with good valves?

  • Thread starter Thread starter MisterCinders
  • Start date Start date
M

MisterCinders

Guest
My valves are good. Checked them last week. Bike struggles with starting though.

Even with warm weather, she needs lots of choke to start and putters at 1000 rpm with full choke for awhile. After some time I can kill choke and salvage the idle with a hearty rev. That seems to break through, because it runs fine thereafter. After running for.while it.starts right up.

Sometimes it won't start unless I open the idle screw more, having to dial it back once it breaks through. The idle doesn't hang or sag.

Ideas?
 
funny how you dictate your vast carb building knowledge to members old and new, when actually you cant even set your own carbs?????
try Bascliffs web site tutorial, thats worth a look, or buy a quality carb rebuild kit and start from fresh again.
 
Have you performed a compression check lately? Only other thing I can think of is carbs.
 
Nessism said:
Have you performed a compression check lately? Only other thing I can think of is carbs.
Click to expand...

Compression is solid and even across all four. Still working through the idle settings but carbs fully cleaned.
 
Agemax said:
funny how you dictate your vast carb building knowledge to members old and new, when actually you cant even set your own carbs?????
try Bascliffs web site tutorial, thats worth a look, or buy a quality carb rebuild kit and start from fresh again.
Click to expand...

Dictate? Really?

Quality carb rebuild kits come from three sources - Santa Claus, the Easter Bunny and The Tooth Fairy. Not gonna wait until Christmas and just missed Easter. Here in the US, we stop losing teeth at about age 12.

Let me know if you have some useful info.
 
Agemax said:
check your intake boot o rings?
Click to expand...

They looked pretty good when I took them out of the package last week to install with my new boots. Plus, the idle is fine once the engine gets over this odd kick off obstacle. No hanging or sagging. Last night's low throttle chop showed plugs that were almost right on the money. One or two were just a touch on the rich side, but only barely.
 
Last week, when I rebuilt the carbs with quality parts despite the lack of kits. Since the air filters run all the time, I don't see how a dirty filter would hamper starting but do nothing to the idle otherwise.
 
Gunk in your choke pick up tubes or where they pop in the float bowls. Your choke isn't working if she's only revving at 1k.
 
hampshirehog said:
Gunk in your choke pick up tubes or where they pop in the float bowls. Your choke isn't working if she's only revving at 1k.
Click to expand...

I'll check them again. Note that once it gets over the hump, the revs do climb with choke per normal. It's just the first start up that struggles.
 
How long has it usually been since you last ran it? What you describe sounds like being on the verge of needing primed (due to fuel evaporating or leaking from the bowls). If my CV carbs sit for a couple weeks, it takes a little time for them to recover.
 
Dogma said:
How long has it usually been since you last ran it? What you describe sounds like being on the verge of needing primed (due to fuel evaporating or leaking from the bowls). If my CV carbs sit for a couple weeks, it takes a little time for them to recover.
Click to expand...

This happens if the bike sits for more than 3-4 hours, overnight, etc.
 
When you cleaned your carbs, did you pull the choke plungers out and make sure everything in that circuit was clear and clean? If everything else you mention has been done, is in speck, and from your explinations, it only seems to happen on a cold engine, it HAS to be in the choke circuit. Is the choke slide pulling the plungers ALL the way out?
 
hampshirehog said:
Gunk in your choke pick up tubes or where they pop in the float bowls. Your choke isn't working if she's only revving at 1k.
Click to expand...

I would have to go with the enrichener tubes, sounds like they are partially plugged.
 
Most of the bikes I've had don't accept full choke. Bogs em out. There's usually a "sweet spot" in there somewhere. In between causing it to rocket to 5grand and not starting a all. Burbles along at 1800 or so.
Anyway, have you looked at your plugs? If you're giving it full choke every time you go to start it you may have carbon fouled them.
Other than that, I'd take some fine copper strand wire and like through the pick up tubes in the carbs and spray some cleaner through the corosponding passage in the bowls. Watch your eyes. ;) make sure the pattern is even.

If you've any fine sediment/rust in the tank it may be small enough to pass the screen in the petcock...
 
Dave8338 said:
When you cleaned your carbs, did you pull the choke plungers out and make sure everything in that circuit was clear and clean? If everything else you mention has been done, is in speck, and from your explinations, it only seems to happen on a cold engine, it HAS to be in the choke circuit. Is the choke slide pulling the plungers ALL the way out?
Click to expand...

I did tale care to check the plungers and blast those passages. But I tend to agree that something there is amiss. I will pull them soon since I need to fine tune the needles and Prolly change the mains soon. Thanks.
 
Check the plugs, like the other guy said.. Sooty plugs will give a hard start, but tend to warm up and run normal-ish, like you describe.

You're sure that your Air and Fuel screws are set correctly?
 
Fuel about one turn, and air two. Plugs after an idle chop are pretty good.
 
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