Has anyone had an engine that wants to tilt?



Can anyone shed some light on this for me...please?
This is the first time I've run into this. It's on a bike that I built a couple of days ago :(
I've done everything that a semi knowledgable person can do as far as remounting, and being 100% certain that everything is proper. (I've built more than 30 bikes so far, and this is the first time I've had this problem.)
And even after doing all of that...again yesterday, I took it for a boot...cruised around 60 km/h for about 5 minutes, and again the engine started to lean over to the left.
It's the jug that is tipping to the left, almost as if the engine were rotating in the bike's frame.
Is there anyone else that has had this problem before and what is a corrective action to use?
I would hate to spoil a great looking bike with a headstay, but that is the only thing left in my mind to keep it sitting upright.
I am not at home this weekend so I have no way of taking any pictures of this tilting engine. I will try to send a pic probably later today or tomorrow.
Any, and all advice is appreciated.
Thank you


Sounds like the motor is not bolted tight and is turning with the torque.


if you're completely stumped and this is an unusual situation, why not it take off and closely inspect the holes for the proper angle (i suppose the whole block could have been off during the drilling process)...or the frame size could be just a tad too small?


Active Member
Local time
3:27 AM
Dec 15, 2006
Fountain Hills, AZ
do you have another motor mount spacer you can try?
sounds like it's not sitting right in relation to frame
hopefully, that's all it'll be

Large Filipino

Take a beer can,cut it up and wrap some around the frame where the mounts go.


I have never installed one of these engines but will offer my $0.02.

If all else is OK, there just might be a sympathetic vibration between this engine and frame causing the motor to move. Try cleaning the frame n' motor mounts and install with a coating of adhesive silicone in the area of frame contact. Give it 36 hours to completely set-up.


Thanks, but I have done the remount thing like 4 times now

Thanks to everyone for the quick responses.
I have un-mounted, checked, and remounted everything 4 times over now. This is why it is so baffling to me. I can understand if a stud was not mounted proper and squared, or if the rear mount spacer block was not honed, and angled correctly (I contour it to better fit with the seat post tube), but none of these things appear to be an issue...everything looks great to my naked eyes, lol.
I'm actually starting to think (as I'm writing this) that I will leave it alone until I get back home, and try a different mount spacer in there. I guess it is possible that maybe I messed up the angle or something when I honed it down...looks ok with the eye though.
I'll still upload the pic later when I get home, and will definately be sure to write and let everyone know if a different spacer block solves the problem.
Thanks again everyone, the help is appreciated.


Well-Known Member
Local time
5:27 AM
Nov 4, 2006
Pittsburg, Ks.
is your engine tilting to the left under torque? then does it right itself when you let off the throttle?


:confused:what system do you have? friction drive? gear chain drive? GEBE belt drive?
is the engine on left or right side of bicycle wheel?