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1985 Suzuki LT230 backfire carb issue

Old 03-01-2019, 05:42 PM
Zachary Johnston's Avatar
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Join Date: Feb 2019
Posts: 8
Default 1985 Suzuki LT230 backfire carb issue

This Suzuki has been hiding it's whole life. Picked up a service manual and did the following. Cleaned the carb, new spark plug, valve adjustment, checked timing is good, sealed leaking valve cover, checked cam chain, new fuel line, inspected vacuum line and breather hose, cleaned air filter and a runs a bit better. The idle and air/fuel adjustments do nothing. I have it 2 3/8 out. Has a slight back fire. I now rebuilt the carb with a new kit and still nothing has changed. I've rebuilt a dozen carbs but haven't ran into anything like this. Starts right up with choke, runs good then idles high and back down. After a warm up around the block it idles for about 20 seconds without the choke and then dies. Hmmm.
Old 03-01-2019, 06:39 PM
Join Date: Feb 2019
Posts: 52

If the mixture and idle screws do nothing, I would suspect your pilot jet is still blocked. Running with the choke on (which circumvents the pilot sorta/kinda) tends to confirm this.
...that's my guess, anyway....
Beautiful Quad! Barn find?
Old 03-01-2019, 07:50 PM
Zachary Johnston's Avatar
Weekend Warrior
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Join Date: Feb 2019
Posts: 8

I first cleaned the old pilot jet then afterwards cleaned out the gas tank but didn't run a fuel filter. I then installed all new carb parts. Same results. Yep barn find. An actual find from inside a barn . Thanks!
Old 03-02-2019, 02:08 AM
Extreme Pro Rider
Join Date: Oct 2013
Location: Lancaster England
Posts: 3,727

Use it! A bike that has stood isn't going to run perfect, and many bikes don't like being left idling anyway. The more you use it the better it will run.
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