I'm tinkering on a friends M600 as it would flood therefore foul the plugs on startup. This I attributed to float needles being dirty. Yes there was some crud on the viton tips etc. Cleaning the needles it starts fine, but after my first ride on it it has a nasty burble and stumble when you ride it.
I should have ridden it before I cleaned the needles and seats but it wouldn't run as the third set of plugs were fouled.
Just off the pilot jets and onto the needle it runs like crap. If you give it half or more throttle it will then accelerate ok. This bike has the top of the airbox cut off exposing the K&N filter. Noting this I wonder if it has a jet kit of sorts.
From the pilot jet up through the emulsion tube, and forward to the idle bleed hole in the floor of the carb. Shoot some carb cleaner through it and blow through with compressed air.
Have the mixture screws been uncapped yet?
Do the needles have the Mikuni numbers on them, or are they almost bare (jet kit)?
So many questions....
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Diaphrams in the fuel pumps have been known to rupture and cause extra fuel to be introduced to the engine by way of the fuel pump vacuum line vs the carbs
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Carbd Monsters have a vacuum operated fuel pump. If the diaphram in the pump gets a hole it it, fuel is sucked into the engine through the vacuum line and floods the engine.
Better?
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Here's the update on the lumpy bumpy running M600.
A previous owner installed a jet kit.
Idle and pilot jets are stock. The mains were upped from 132.5 to 145.
Slide needles of X value are used.
I did the R&R and clean out of the carbs. The needles were set to max up position therefore dumping massive fuel over ~3000 rpm causing the poor running. After all, if some fuel is good, a lot must be better.
Now it runs pretty nice as it's not fueling more than my 998 needs.
It seems a little weak in the mid range from what I attribute to the hacked up airbox.
* The needles ride on a flat washer which sits on the slide floor. This area of the slide has a step in it which causes the needles to become cocked. I wonder if the original setup had a D shaped washer which would allow the needles to sit flat like they should therefore be centered in the needle jet holders.
Ducman851,
I disassembled the fuel pump. At 8500 miles the diaphragms seem ok. If in the next few days I encounter the flooding upon startup I'll feed it a rebuild kit without hesitation. Both the pump and the petcock hold vacuum for 20 minutes on their respective diaphragm sides.
Thanks for the help guys. This little gem is coming along nicely. A little more tweaking and making some D shaped needle support washers and it'll be perfect.
Here's the update on the lumpy bumpy running M600.
A previous owner installed a jet kit.
Idle and pilot jets are stock. The mains were upped from 132.5 to 145.
Slide needles of X value are used.
I did the R&R and clean out of the carbs. The needles were set to max up position therefore dumping massive fuel over ~3000 rpm causing the poor running. After all, if some fuel is good, a lot must be better.
Now it runs pretty nice as it's not fueling more than my 998 needs.
It seems a little weak in the mid range from what I attribute to the hacked up airbox.
* The needles ride on a flat washer which sits on the slide floor. This area of the slide has a step in it which causes the needles to become cocked. I wonder if the original setup had a D shaped washer which would allow the needles to sit flat like they should therefore be centered in the needle jet holders.
Ducman851,
I disassembled the fuel pump. At 8500 miles the diaphragms seem ok. If in the next few days I encounter the flooding upon startup I'll feed it a rebuild kit without hesitation. Both the pump and the petcock hold vacuum for 20 minutes on their respective diaphragm sides.
Thanks for the help guys. This little gem is coming along nicely. A little more tweaking and making some D shaped needle support washers and it'll be perfect.
Very nice!!
Thanx for the update. I would think that if they both hold vacuum for that long the diaphragms should be fine.
__________________
Give a pig a fish and he'll eat for a day, give a pig bacon and his relatives arent safe.
M600 stumble
Linear Mode
