Bystarter valve spec

[Jules01983]

Hi, I've read quite a bit about the troubles with the bystarter valve. I have read the manual that describes the testing procedure but that only tests the resistance of the heater coil within the unit. Does any one have the measurements for the valve slide in the valve open (shortest length from plastic housing to base of slide) and closed ( longest)? The valve in my daughters 'ped is 10mm at its shortest but the 'ped is really hard to start when cold. Squeezing the air intake hose flat helps to start it but it takes a good 5 minutes before you can actually ride it away. Knowing the travel would greatly help in determining functionality of the valve.

[JayAre]

My manual says to test the port, hook a battery to the leads wait 5 minutes & blow in the port to see if it closes. Then wait 30 minutes to see if it's open. There's no measurement spec. You could measure the depth of the port in the carb then how much the by-starter pulls back. I would think it shouldn't have to pull back much more than the diameter of the port to get full flow. ?

[Jules01983]

Thank you JayAre, I did see that but was hoping someone might have a known good unit in their spares that they could just quickly measure and post the valve length when it is cold (ie, open). I guess I'll have to perform the "blow test" which is a pig as the connection in the cable seems to be jammed up under the fuel tank.

[JayAre]

Mine was plugged in behind the right side panel & yes I had to take it off. You could run the bike then pull the by-starter out & measure it let it cool measure again see how it compares to the depth in the carb to the port seat.