View Full Version : engine boggs down while accelerating
gemini
10-16-2014, 02:43 PM
I have a 2006 GZ250 with 8,000 miles. I just had it tuned up less than a month ago. I was riding home from work the other day, everything was fine, then I stop at a red light. When I accelerated the engine bogged down. I got out of the throttle and it idled fine. I tried to accelerate and it would lose power again. I coasted into a parking lot. I shut off the bike and it started right back up no problem. The bike idled fine but I could not give it much throttle without it bogging down. I left the bike for a couple of hours till traffic slowed down. I went back and it started up just fine and was idling normal but still it would fall on it's face when I tried to give it throttle. I put it in 1st gear and was able to idle around the parking lot fine. I was able to shift into 2nd gear and could give it just a little throttle before it would lose power again. I finally was able to ride the two blocks home but if I gave it throttle and held it open the bike would bog down for a second then it would surge back to power for a second then bog down again. It jerked up and down all the way home as long as I was trying to accelerate. I started it the next day and it did the same thing. I rode it around the parking load I could ride in 1st giving it just a little throttle before started bogging down again. I have tried riding it a couple of time now and it runs fine as long as I only give it a little throttle. I can keep speed and shift up to 2 and 3rd gear giving it a little gas. Once I get to a certain point it starts jerking again. Any Ideal what is causing this.:???:
jonathan180iq
10-16-2014, 03:49 PM
You have a large vacuum leak, or air leak, somewhere in the intake.
Check the "S" tube that runs from the bottom of the airbox to the crankcase. It's on the left side (passenger side US)
If that's not it, check the coupler boots on both sides of the carb, leading into the card from the air box, and then leading form the carb to the head.
What you're describing is too pronounced to be a simple vacuum line coming undone - but if you don't find it in the places I mentioned, then check those. There are 3 of them, connecting the bottom of the tank to the carb body.
raul10141964
10-16-2014, 03:54 PM
check for dirt on the main jet
tnastvogel
10-19-2014, 01:20 AM
bad/clogged pilot jet? or maybe a bad vacuum diaphragm? take apart your carb and inspect/clean it.
gz4me +
10-19-2014, 06:52 AM
What does the air cleaner look like? When was the last time it was changed or cleaned? The neighbor next door had same problem on his honda scooter. The scooter would start and idle fine. As soon as he gave it gas, it would stall. When he changed air cleaner, scooter ran fine.
raul10141964
10-19-2014, 12:24 PM
pilot jet affect the idle, main jet affect from 1/4 to full throttle but mot the idle.
clean the carb and install an inline fuel filter
Water Warrior 2
10-19-2014, 04:16 PM
Oh yeah, do install an inline fuel filter. A little prevention is worth a lot of time saved later on down the road.
Also do not buy cheap gas. Stick with top tier suppliers. You still only need 87 octane but stay away from discount gas suppliers who may have lower production standards.
I suffered from computer codes popping up on my Vstrom until I switched back to Chevron. Wisdom is gained through experience and bad decisions.
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