CT70HK1 Dies When Warm

I finally got some electrical issues sorted with my new CT70HK1. All lights and electronics were working so I took it out for a spin. Unfortunately, the neighborhood I live in is one giant hill and I discovered this issue at the bottom of the hill. I usually start the bike with the choke almost all the way on or mostly on. As the bike gets warm after riding for a bit, I turn off the choke by turning the lever towards the front wheel. This seems to stabilize the idle for a while. Typical operation procedures from the other carbureted bikes I've had. However this is when it starts to die.
I was able to ride the bike for about 50 feet with the choke off and then the bike died. If I waited a few minutes and kicked it again, it would start, run for another 50 ft and then it would die. I pushed the bike home and tried to do a little troubleshooting. I was able to get the bike running again with the choke off, and it would start to die, and if I gave it some gas, I could keep it running for a bit, but it would eventually die if I wasn't constantly giving it gas.
I haven't played with any of the settings on the carb, and I wasn't sure where to start with this. To me it sounds like maybe an issue with float height or the idle mixture screw.
I did double check the gas cap and it was in the on position.
I had a similar issue with a DRZ-400 in the past, and it ended up being bad piston rings so I hope that is not the case here.

Appreciate any assistance.
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Old Guy Too Many Bikes

Well-Known Member
As soon as it dies, open your carb bowl drain and see if anything comes out. Could be fuel starvation caused by obstruction or something limiting the amount of fuel being allowed to enter the carb. Also check for a clogged petcock.
I believe I found the issue. I feel a bit silly, but I was low on gas. I removed the gas cap and checked the tank. The fuel was sitting just below the upper fuel hose inlet. I switched the petcock over to reserve. It fired up and has been idling for 10 minutes without an issue. I'll fill her up and go for a proper ride tomorrow to confirm.

I'm pretty sure what was happening is that I would get just enough fuel in the upper hose after repeated kicks and jostling.
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Active Member
Everybody does this once. Not a matter of if, just when. Does your carb petcock and tank have a RES position and second fuel line? That would’ve gotten you up the hill, or at least part of it.
Everybody does this once. Not a matter of if, just when. Does your carb petcock and tank have a RES position and second fuel line? That would’ve gotten you up the hill, or at least part of it.
It has both yes, the second line and the res position. I had my petcock set to reserve when I confirmed that it would run without a problem as per my last post.


Active Member
If I read your post correctly you said you turn OFF the choke you push the lever toward the front wheel?? That would be turning the choke on, with the lever closest to air cleaner that would be off position. Pics to clarify what positions I mean.


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Honda Hornet

Active Member
The perfect resolution to a Honda problem. No amount of their design improvements solved how to make these motors run without gas in the tank. I cannot tell you how long I worked on trying to get my 1978 CT90 K9 to start after installing a new carburettor to later discover that it did not have enough gas. More than a hundred kicks, I am sure, with tweaking the pilot and mixture screw in all directions in between. And do not get me started with finding out that the run switch was turned to off, leading me to call a friend with a pickup truck to rescue me, only to call back and pretend I had made a mechanical breakthrough to get it started.