Motor dyng or other problems?
03-02-2009, 04:14 PM
#1
Thread Starter
My Feedback: (31)
Join Date: Mar 2003
Location: Danville,
KY
Posts: 4,388
Likes: 0
Received 0 Likes
on
0 Posts
Motor dyng or other problems?
I have a duratrax velocity .17 that i got with my rustler. I wanted to see if it ran, so I put my good O.S. carb on it and have been using a drill on the OWB to start it. It fires right up cold, and runs good for the first minute or so, and then without changing the needle settings it just gets really weak. Doesent seem to matter if i change the needle settings, it still just bogs and has no power. It mainly seems to lack on the bottom end. And when it does die, its about impossible to get it to start back.
So, is it just wore out or do i have other problems? Seems like it wouldnt even have time to warm up enough to lose the pinch? The motor seems to have more pinch than my pro .15, but the pro .15 runs perfect. So im not sure if it just needs a good repinching or what. I havent had any luck tuning it out with the carb. It does seem to idle fine.
Any ideas?
So, is it just wore out or do i have other problems? Seems like it wouldnt even have time to warm up enough to lose the pinch? The motor seems to have more pinch than my pro .15, but the pro .15 runs perfect. So im not sure if it just needs a good repinching or what. I havent had any luck tuning it out with the carb. It does seem to idle fine.
Any ideas?
03-03-2009, 07:36 AM
#3
Senior Member
Join Date: Jul 2008
Location: Teaneck,
NJ
Posts: 5,442
Likes: 0
Received 0 Likes
on
0 Posts
RE: Motor dyng or other problems?
Sounds like your pinch is gone. Airleak, maybe, but most who have had such symptoms needed to replace the piston/sleeve or get a new engine.
03-03-2009, 11:54 AM
#4
Thread Starter
My Feedback: (31)
Join Date: Mar 2003
Location: Danville,
KY
Posts: 4,388
Likes: 0
Received 0 Likes
on
0 Posts
RE: Motor dyng or other problems?
I know the carb was right. I took the motor off yesterday, put the carb back on my pro .15, and it ran perfect without touching the needles, so, I feel like the motor must just be worn...
It feels like it has good pinch just turning the flywheel though... IDK, but it has all the symptoms like dying, and hard starting when warm, so i guess its just gonna need a rebuild to run.
It feels like it has good pinch just turning the flywheel though... IDK, but it has all the symptoms like dying, and hard starting when warm, so i guess its just gonna need a rebuild to run.
03-03-2009, 11:59 AM
#5
Senior Member
Join Date: Mar 2007
Location: Daytona Beach,
FL
Posts: 2,384
Likes: 0
Received 0 Likes
on
0 Posts
RE: Motor dyng or other problems?
ORIGINAL: cummins driver
I have a duratrax velocity .17 that i got with my rustler. I wanted to see if it ran, so I put my good O.S. carb on it and have been using a drill on the OWB to start it. It fires right up cold, and runs good for the first minute or so, and then without changing the needle settings it just gets really weak. Doesent seem to matter if i change the needle settings, it still just bogs and has no power. It mainly seems to lack on the bottom end. And when it does die, its about impossible to get it to start back.
So, is it just wore out or do i have other problems? Seems like it wouldnt even have time to warm up enough to lose the pinch? The motor seems to have more pinch than my pro .15, but the pro .15 runs perfect. So im not sure if it just needs a good repinching or what. I havent had any luck tuning it out with the carb. It does seem to idle fine.
Any ideas?
I have a duratrax velocity .17 that i got with my rustler. I wanted to see if it ran, so I put my good O.S. carb on it and have been using a drill on the OWB to start it. It fires right up cold, and runs good for the first minute or so, and then without changing the needle settings it just gets really weak. Doesent seem to matter if i change the needle settings, it still just bogs and has no power. It mainly seems to lack on the bottom end. And when it does die, its about impossible to get it to start back.
So, is it just wore out or do i have other problems? Seems like it wouldnt even have time to warm up enough to lose the pinch? The motor seems to have more pinch than my pro .15, but the pro .15 runs perfect. So im not sure if it just needs a good repinching or what. I havent had any luck tuning it out with the carb. It does seem to idle fine.
Any ideas?
What happens is when the motor heats up the sleeve expands and the motor looses compression, which = low power and eventually stalls. Then it won't start because it has no compression until it cools.
03-03-2009, 12:43 PM
#6
Thread Starter
My Feedback: (31)
Join Date: Mar 2003
Location: Danville,
KY
Posts: 4,388
Likes: 0
Received 0 Likes
on
0 Posts
RE: Motor dyng or other problems?
Yeah, i think shes just worn out. I didnt figure it would warm up enough in a minutes time to expand enough to lose compression though. i guess it does. Maybe ill try pinching it back myself
