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honda sb50 won't start
Posted: Wed Aug 05, 2009 1:26 pm
by mrT
I have an old honda elite from like 1986. I got my carb cleaned, pressure tested, new float, and new autobystarter (cost me only forty bucks), pressure tested the engine which turned out fine, have a spark, fuel is getting to the carb, but it still won't start. i was wondering if it needs an airbox to start. if not what could the problem be?
Re: honda sb50 won't start
Posted: Wed Aug 05, 2009 4:36 pm
by Bear45-70
No air box can cause major problems when starting as it tends to lean the mixture out too much. Have you tried squirting a small amount of gas and oil mix into the carb and tried starting it then? How do you pressure test a carb?
Re: honda sb50 won't start
Posted: Wed Aug 05, 2009 4:42 pm
by bradthreee
Bear45-70 wrote: How do you pressure test a carb?
Take a look at the manual, it tells you to test the carb that way, though I've never done it before.
Re: honda sb50 won't start
Posted: Wed Aug 05, 2009 4:55 pm
by Bear45-70
bradthreee wrote:Bear45-70 wrote: How do you pressure test a carb?
Take a look at the manual, it tells you to test the carb that way, though I've never done it before.
They call it a pressure test when in reality it is a vacuum test.

They even label the pump a vacuum pump.
Re: honda sb50 won't start
Posted: Wed Aug 05, 2009 6:45 pm
by hondaman
As a great wise man once said "No airboxy--No starty!"
Re: honda sb50 won't start
Posted: Wed Aug 12, 2009 7:32 pm
by mrT
ok i found out that the problem wasn't a missing airbox but a simple problem: a leaf was jammed in my reed valve
just a little carb tuning and it works great, without an airbox.
ALWAYS CHECK UR REED VALVE IF UR SCOOTER DOESN'T START!!!
Re: honda sb50 won't start
Posted: Wed Aug 12, 2009 8:16 pm
by hondaman
Better check your plug and see what it looks like. I think you will find it a whitish color.