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Post by 2wheelxtreme on Dec 20, 2011 17:28:31 GMT -5
Whats sputter bogging caused by? Ill be driving at around 40mph and when i advance the throttle itll just bog and sputter until the bog clears up. I changed out the fuel lines and the spark plug and made sure everything was tight on the carb.
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Post by sprocket on Dec 20, 2011 18:24:27 GMT -5
Air/Fuel mixture... maybe try replacing the fuel fiter, petcock? fuel pump? don't know...
Have you had the carb opened up? Could be a float level problem
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Post by threedogs61 on Dec 20, 2011 19:45:03 GMT -5
Could also be tight valves. I know everyone hates to hear this problem solver...but it's worth checking.
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Post by richardthescooter1 on Dec 20, 2011 19:55:38 GMT -5
Sprocket, and threedogs61. your both right, I'd check the valves first and then adjust the a/f mix, turn all the way in, then 2 1/2 turns out  |
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Post by sprocket on Dec 20, 2011 20:06:36 GMT -5
richardthescooter1.. YES BUT 2.5 turns is NOT where it should be. No wonder it is bogging if that is your setting! 2.5 is just the starting point so the engine will run while you do the adjustment... You need to adjust it by varying the A/F setting on a hot engine until you get it to the highest idle...that is the correct A/F mixture... There are 1000 post here about how to do this....search it out
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Post by sprocket on Dec 20, 2011 20:12:49 GMT -5
Here is Lefty's wonderful description ~
ADJUSTING YOUR AIR/FUEL MIXTURE:
YOU WANT THE HIGHEST RPMS OUT OF THE AIR/FUEL MIXTURE SCREW:
Before you start it Turn the Air/Fuel Mixture Screw CLOCKWISE UNTIL IT STOPS do not tighten it just until it stops BUT COUNT how many TURNS IT TOOK TO CLOSE it. Then Turn it COUNTER CLOCKWISE the same amount of turns back to where it was or 2.5 turns.
Start your scoot and Get The Engine Nice and Hot about 10 minutes so that the Enricher is no longer Allowing Extra Fuel to come in. Then do the following to fine tune the Air/Fuel Ratio:
RICHEN THE AIR/FUEL MIXTURE:
1. Turn the Air/Fuel Mixture COUNTER CLOCKWISE 1/4 turn and wait 10-15 seconds to let the engine catch up with the new setting.
a. If the RPMS go up REPEAT 1 UNTIL the RPMS GO DOWN OR NO CHANGE.
b. Then TURN the Air/Fuel Mixture 1/8 CLOCKWISE and that should be your highest Air/Fuel Mixture setting , GO TO 3.
*****If on the FIRST 1/4 TURN from the STARTING Position IN #1 ABOVE the RPMS GO DOWN OR NO CHANGE , turn the Air/Fuel Mixture Back the 1/4 turn to the Starting position and wait 10-15 seconds until the engine catchs up and go to #2*****
LEAN THE AIR/FUEL MIXTURE:
2. Turn the Air/Fuel Mixture CLOCKWISE 1/4 turn and wait 10-15 seconds to let the engine catch up with the new setting.
a. If the RPMS go up REPEAT 2 UNTIL the RPMS GO DOWN OR NO CHANGE.
b. Then TURN the Air/Fuel Mixture 1/8 COUNTER CLOCKWISE and that should be your highest Air/Fuel Mixture setting, GO TO 3.
IDLE SPEED SCREW:
3. If after adjusting your Air/Fuel Mixture your idle is to fast Turn the IDLE SPEED SCREW COUNTER CLOCKWISE until your Rear Wheel JUST Barely wants to Turn or around 1500-1800 rpms.
4. If 1 or 2 above DOES NOT produce any RPM Change you most likely have a CLOGGED PILOT JET "OR" you did not get the ENGINE HOT ENOUGH and you were working against the ENRICHER which has not yet closed off the extra fuel. If the engine was nice and hot running for about 10 minutes and the Enricher was off then its time to take off the Carb and Clean out the Jets and all the Carb Passages.
If adjusted correctly you should be able to give the Throttle a QUICK half turn and the Engine should REV UP with no bogging hesitation and get a nice VROOOOOOOOOOOM. The Rpms should come down nice and settle at the Rpms you set your Idle to.
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Post by richardthescooter1 on Dec 21, 2011 9:03:03 GMT -5
Thanks guys, I did my adjustment while my scoot wasn't running. I had a lot of issuses with stalling going 50+ and climbing hills, I did the valve adjustment, took out carb, adjusted float, in my case the a/f was set to the leanest, but my needle jet was set to the richest, so by turning all the way, then counting out 2 1/2 turns, made the difference I needed for my scoot run great, starts up one crank, run great, no more problems. Also as I was thinking about the cause of sputter and bogging, my thoughts would be the float, that was one of my problems.
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Post by sprocket on Dec 21, 2011 11:45:59 GMT -5
richardthescooter1 you can't adjust the air/fuel mixture without the engine running on a hot engine. 2.5 turns puts you in the ball park, but you could be running very lean...you need to adjust it properly...
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Post by richardthescooter1 on Dec 21, 2011 13:12:16 GMT -5
Thanks sprocket, I'll check it out when good wheather is here.
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Post by threedogs61 on Dec 21, 2011 18:53:23 GMT -5
Thanks guys, I did my adjustment while my scoot wasn't running. I had a lot of issuses with stalling going 50+ and climbing hills, I did the valve adjustment, took out carb, adjusted float, in my case the a/f was set to the leanest, but my needle jet was set to the richest, so by turning all the way, then counting out 2 1/2 turns, made the difference I needed for my scoot run great, starts up one crank, run great, no more problems. Also as I was thinking about the cause of sputter and bogging, my thoughts would be the float, that was one of my problems. Glad to hear it's running better. My thoughts are that the valves were the problem. Were either of them tight? In the future it might be a good idea to try one correction at a time because if you do multiple corrections at the same time you don't really know which one solved the problem. |
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