Engine idles but 'bogs down' under load
Apr 30, 2013 | 12:34 PM
#11
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Weekend Warrior
Joined: Apr 2013
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Well this evening I put an NGK plug it and started straight away and ran sweet. 1st gear could be engaged and you could pull away with just feathering the throttle, and that was with me on it 
Then, as it was idling before putting it away it just cut out and wouldn't restart.
Plug out and no spark whatsoever
So now I have to locate whats causing the no spark. I guess the first thing is to look at kill switch wires, anyone in particular can it be tested with a multimeter?
Then, as it was idling before putting it away it just cut out and wouldn't restart.
Plug out and no spark whatsoever
So now I have to locate whats causing the no spark. I guess the first thing is to look at kill switch wires, anyone in particular can it be tested with a multimeter?
May 1, 2013 | 02:48 AM
#13
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Weekend Warrior
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I take it the kill switch gives a 12v to the starter relay and the coil, any idea which wire does which?
May 2, 2013 | 06:01 AM
#14
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Weekend Warrior
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Well fingers crossed I think I have sorted it 
It started on the button this morning butI noticed that when I put some weight on the right hand handlebar it started to want to cut out.
So I thought some wiring must be getting aggravated somewhere and I soon narrowed it down to the safety cut-out switch on the left hand side of the engine. When I wiggled the wires on that again the engine wanted to cut out.
So I snipped the wires and connected them up, taking out the switch. Now no matter what movement I do on the quad there is not cutting out, result!!
Cheers for all the help
It started on the button this morning butI noticed that when I put some weight on the right hand handlebar it started to want to cut out.
So I thought some wiring must be getting aggravated somewhere and I soon narrowed it down to the safety cut-out switch on the left hand side of the engine. When I wiggled the wires on that again the engine wanted to cut out.
So I snipped the wires and connected them up, taking out the switch. Now no matter what movement I do on the quad there is not cutting out, result!!
Cheers for all the help
Dec 30, 2016 | 10:28 PM
#16
Weekend Warrior
Joined: Dec 2016
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as your slide or butterfly on your carb opens, the lower pressure sucks in more air as more gasoline is sent to piston via the carb. the carb is trying to maintain the ratio. when it bogs down when the throttle is pressed, you're demanding more fuel, right? well, with a partially clogged/plugged jet, the gasoline demand is not met BUT you still have more air coming in offsetting the ratio. NOW, fuel demand is not met to sustain the burn and the quad bogs. does that make sense? hope so, i got cramps from typing
. but anyways, that is a fuel delivery issue that needs to be rectified. to test for vacuum leaks at the intake boot, let it idle, spray carb cleaner or ether-starting fluid around the outside of the intake boot-not the airbox side. if it revs up, you have a vacuum leak that sucked in the vapors and fed the piston downstream of the carb. could be as simple as making sure the flange/O-Ring is on correctly or replacing the intake boot.
. but anyways, that is a fuel delivery issue that needs to be rectified. to test for vacuum leaks at the intake boot, let it idle, spray carb cleaner or ether-starting fluid around the outside of the intake boot-not the airbox side. if it revs up, you have a vacuum leak that sucked in the vapors and fed the piston downstream of the carb. could be as simple as making sure the flange/O-Ring is on correctly or replacing the intake boot.
Dec 30, 2016 | 11:22 PM
#17
Weekend Warrior
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I think I may agree with you on this one for my situation , because my bike is bogging out huge when I push the throttle in fast , but if I go slow and steady at up to half throttle it it seems okay but the faster I go and the more I push past half way , it gets jerky and sputtery .
Sep 12, 2018 | 02:46 PM
#18
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jaster94 checking for air leaks posted 4/28/13
Do not spray 'ether' or 'quick start' any where near a hot engine or exhaust pipe. Brake cleaner is also combustible.
Do not spray 'ether' or 'quick start' any where near a hot engine or exhaust pipe. Brake cleaner is also combustible.
Last edited by alo; Sep 12, 2018 at 02:56 PM. Reason: incomplete
Sep 23, 2019 | 03:51 PM
#19
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it's not the CDI, put it up on blocks and tie it down or hang the rearend from the ceiling. start it and rev it up with the rear axle off of the ground, does it do the same thing? does it do it in neutral? if in gear and it does it, may start looking at clutch, if it does it in neutral, it's a vacuum/fuel delivery issue like a partially clogged main jet.
