Hard starting

A place to discuss matters related to Honda Helix scooters.

Hard starting

Postby red baron » Thu Dec 10, 2009 10:23 am

This is my first post as I am a new member. My wife's prisitne 87 Helix 250 is VERY hard to start. Sometimes I run the battery down just getting it to fire. Then it sort of chugs until it warms up. Runs good and starts OK all day long after it warms up. Any common problems with this model? I am an automobile technician so I can understand anything you may offer. The Helix has low miles on it and runs great otherwise. Thanks for your help ahead of time. Marty
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Postby dneilson » Thu Dec 10, 2009 10:53 am

Here's the Service Manual, maybe some of the troubleshooting will help you.

http://bill.laudeman.com/helix/manual/index.html
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Postby slonaker » Thu Dec 10, 2009 4:10 pm

Welcome to the forum! This looks like a good place to start.

http://bill.laudeman.com/helix/manual/04-02.html

Patrick
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Postby alexkram » Thu Dec 10, 2009 4:31 pm

I need more information. How long does it need to sit before it is hard to start?

If it takes only a day or so:
Your choke is likely malfunctioning. I don't know how the helix choke works, check the service manual.

If it takes over a month:
Your carb vent tube is likely disconnected, allowing the fuel in the float bowl to become stale very quickly. The function of the vent tube is to allow the carb bowl to be at the same pressure as the atmosphere, but to prevent lots of evaporation which would cause the fuel to go stale quickly.
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Change the bystarter!

Postby zozman » Fri Dec 11, 2009 6:03 am

Tech Tip #24 So Your Honda Scooter Won't Start?

One of the most frequently asked questions on the posting board is about starting a Honda scooter especially after it has been inactive for awhile. I follow these steps first:

1. Be sure the Run Engine switch is in the "on" position. The engine won't run if the kill switch on the handlebar is in the "off" position.

2. Empty all the gas out of the tank and fill with fresh premium gasoline.

3. Below the gas tank is the gas valve which allows gasoline to pass into the carburetor by vacuum. Check for clogged fuel valve by applying suction to the small hose. If gas flows from the large hose, it's working.

4. Be sure the gasoline cap vent is not clogged.

5. If your bike has a fuel filter, check that it is not blocked. Be sure your air filter has no obstruction.

6. There is a fuel strainer in the gas tank and it should not be blocked.

7. Pull the spark plug and ground it. Crank engine to see that spark jumps through electrode. Absence of spark indicates fouled or broken spark plug, faulty CDI unit,faulty pulse generator, faulty ignition coil or ignition switch.

8. Be sure you have a good battery. The ignition runs through the taillights on Hondas. Squeeze left brake or depress foot brake to be sure the rear taillight illuminates. if it does not--the scoot will not start.

9. Squirt starting fluid into carburetor throat and crank engine. If you have any spark, the scoot must start unless faulty compression exists.

10. Poor starts can frequently be attributed to a weak or faulty autobystarter (electric choke). if this occurs, your scoot will start hard but won't idle by itself without a babied throttle until it warms. Replace bystarter if this condition exists.

11. Check that the carburetor is snuggly fixed into its housing on the intake. Some Honda scooters have a two-piece rubber intake boot which may develop cracks. Check that there are no vacuum line leaks leading to the intake or fuel valve.

12. Last resort--run compression test on cylinder.

Randy Pozzi (Rev. 03/2005)
What goes in here?
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Carb

Postby red baron » Fri Dec 11, 2009 9:04 am

Thanks for the helpful replies! This bike runs great ONCE IT STARTS! No performance problems. I did notice several references to a thermal enrichment valve. Apparently this valve is responsible for cold starting. I did a little research and found out this valve is about $65.00 from Honda. On Ebay I can get a BRAND NEW CARB with the valve complete for $60.00 + shipping! Sounds like the way to go here. Opinions/comments please everyone! Thanks for your time. Marty
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Postby slonaker » Fri Dec 11, 2009 2:59 pm

The carb on ebay is probably a Chinese made one for a Helix clone, FWIW. I have no experience with them.

Patrick
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