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Wont start shoots fire out of carb, already checked keyway, checked timing inside, what am i missing? any help is very appreciated.

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Check the spark at the sparkplug,compression (piston rings,intake and exhaust valve clearance,cilinder gasket)and carburator"s adjustment.Happy new year!

best regards savumihai71

Posted on Jan 05, 2009


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Cranks and fires but wont strats

Hi Anonymous, sounds like you have a fuel pronlem. Check fuel flow to carb, check fuel filter remove air cleaner and squirt starter fluid or Brake Kleen into carb throat, if it fires up and runs for a few seconds then you have a carb problem. Remove carb and bowl clean clogged jets and air passages, and clean bowl. Visit website below to download cheap ( $5.50 ) service manual that will walk you through it and also trouble shoot:
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Engine sincronize time

the timing is not adjustable
the rotor rest on a keyway on the crankshaft.
the pick-up(signal generator) rest outside the rotor.
the pick-up send the signal to the CDI
the CDI send the signal to the corresponding coil pack.
which fires 1&4 cylinder coil pack, then 2&3 cylinder coil pack.
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Now if your refering to your carbuetors, you can sync those.
On the bench:
Basically sync the carbs so the butterflys all open and close at the same time. turn the idle srew in so butterflys will start to open and you can see daylight through them.
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must have a vaccuum gauges also called manometers.
hook up the manometers to your carbs and run at 1500-2000 rpm
adjust the carb butterfly ajustment screws in small increments while watching the manometers vacuum gauges, adjust untill all the same level
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sometime the outside carbs run different then the inside carbs
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remove the muffler and try it carbon plugs up the screen inside if runs good with out the muffler open the muffler and clean the screen

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Konked out still cranks wont fire 99 pulsar 1.6 auto replaced pump

Always check for the basics before replacing stuff to avoid time wasted and costs.
Check for spark at plugs while cranking,use a plug with a gap stretched out wide to work coil and module.It should be a healthy crack when it sparks.
Check for lack of fuel by spraying a carb or brake cleaner into open aircleaner while engine is being cranked.If it starts you will need to test fuel pump and power to it.
Check compression,nil or very low indicates broken timing chain/belt/keyway or internal damage.
I hope this helps,let me know your findings and we can work towards a fix.

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Hi 2000 yamaha Vmax, 4600 miles on the clock.

This sounds like a carburetor problem. Either bad gas, partially plugged pilot jets, carb diaphragm cracked or has a pin hole, carbs out of sync or diaphragm cap is not tight. It would be best to have a dealer check it out. However, before going to the dealer I would try one thing. Drain the float bowls on all four carbs. There is a drain plug on the bottom of each bowl. Condensation inside the gas tank can make it's way into the carb. Bikes don't run well with water in the gas. Please rate my solution. Thanks.


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1 Answer

Having trouble to get it running it fires but wont run i have new plugs and cleaned the carbi and fuel on a bolons st 120 1990 modle ridermower

choked? bad gas. gas sitting for only a few months will go bad. Spray some WD40 into carb and try to fire. if it runs replace gas. Check to be sure keyway has not slipped

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My 5700 runs about 5 min. then back fire out the carb and then wont start for about 10 min. then it starts and run about 5 min. and stop agin i clean the carb check the valves

I would first said that your intake valve is not sealing like it should (burned, warped, etc). But, you have already checked that.

The other reason for a backfire is timing. Could your magneto or keyway be heating up and moving throwing off the timing? And speaking of keyways, how does the woodruff key look? Is it chewed up or distorted?

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Try to squirt a little gas in the carb and see if it pops or tries to run for a short time. The diaphram in the carb is probably old and hard. That would be the first place I would look.

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your problem is inside the carburator.there is a small screen inside that needs to be cleaned out.take the single screw from one side of carb.there is a small screen in side.carefully take an air hose and blow it not blow to hard or the screen will blow out.once it's clean the unit will start right up.hope this helped,let me know.................................

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