'Round The Campfire > General Technical

Starting Trouble When Hot

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Jack Straw:
My bike starts easily with little or no choke in the hot weather here in Arizona.  Runs perfectly, pulls strong, feels totally normal.   After riding at normal temp for a few miles it won't re-start.   

I pulled the choke plungers out for inspection and they look fine.   A former American Honda tech suggested that one or more of the plungers might be leaking leaking or not seating properly causing over-rich condition when hot. 

The fuel cap is venting normally, fuel is fresh.  Battery has 12.7 volts.   I'll check the coil resistance but I'm not sure what the ohm values should be.  I'll research that on line.

Anyway, that's my life with the VT at the moment.  I'd appreciate any advice.

Check your valve clearance, tight valves can cause hot start problems

Jack Straw:
Thanks for the suggestion on checking the tappet clearance. :D

A 'Hot, no-start condition' is very common with these bikes.  Typical symptom: go out for a ride, stop for gas, after which the bike won't re-start until the motor cools down.  Popular opinion is the problem is faulty coils which don't show a problem until they're hot.

Jack Straw:
Yep, my problem exactly, It failed to start after a gas station stop.   I checked the primary and secondary resistance on the coils both cold and hot they read 2.5 ohms each, hot and cold primary and about 35K secondary.   These figures are within tolerance according to the Clymer manual.   

In the meantime I received a new pair of coils from Rick's Motorsport Electric and they check out the same primary ohms as the stockers.  I've not installed them yet as that will kill my return privilege.

I'm suspicious of the choke plungers perhaps not closing fully and causing over richness when hot.   That mickey mouse one into two cable doesn't inspire confidence.

Oh, I checked the valve cleances and they're spot on.   

I know there's a solution but I want to fix it myself.  Taking it to the local shop is admitting defeat, silly, but that's the way I see it.


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