vibration with drill vs. no drill front mount; 70cc

tylerlough · #1 08-13-2008, 10:10 PM

I didn't mind drilling the frame on my crappy Huffy but I would like to avoid drilling the frame on my new Moon dog. But if no drill mounting means more vibration then I will drill a hole in the frame. So what method makes less vibration?

Thanks

Andyinchville1 · #2 08-23-2008, 06:52 PM

HI,

I have never drilled a frame BUT it seems to me that if an engine is directly bolted to the frame snugly it will transmit vibrations either way.....Only way to reduce vibrations is to add a vibration dampener of some sort between the engine and frame.

Hope the is helps you.

Andrew

**Dave31** · #3 08-23-2008, 08:56 PM

I agree with Andrew...I don't think it makes a difference if you drill it or not. If it's going to vibrate, its going to vibrate no matter how it is mounted.

tylerlough · #4 08-24-2008, 09:38 PM

I'm going the no drill then, bought a 1.5 inch muffler clamp, some bolts to replace the studs, and 1in. by 3in. 1/8 steel plate. All this was about $4.50.

Still waiting for my friend to bore out my new sprocket.

Revo · #5 08-18-2009, 09:23 PM

I drilled mine, put a piece of tire tread between mount and bike, very little vib, and it looks good.

Deadend · #6 08-27-2009, 09:29 AM

Quote:

Originally Posted by Revo

I drilled mine, put a piece of tire tread between mount and bike, very little vib, and it looks good.

i was going to suggest this - even on a non drilled mounting.

Not tire tread but a bit of inner tubbing. I've used this to dampen vibe on many many motorized applications ranging from a utility case mounting on an enduro to a fake mini gun on a motorcycle's handle bar (lol)

just be sure to torque it down and semi-perm locktite it

spad4me · #7 08-27-2009, 03:00 PM

Your huffy was probably made of steel.
What is the moon dog frame made of ?
Use a sanding drum in a drill to enlarge the hole for your sprocket.

freewheeling frank · #8 08-27-2009, 03:10 PM

i drilled my cranbrook and it lasted about 10 miles the hole wore to about twice the diameter and the single bolt through the frame broke now am running a sbp adapter with inner tube and no problems

city of angels · #9 08-27-2009, 03:16 PM

you could also try the front motoremount from sbp and maybe this will solve the no drill part

carpetrugger · #10 11-21-2009, 05:05 AM

I drilled my frame like it said in my instructions for over sized down tube's. This was before I found the motorized forms. Now I know this is not a good idea as it can weeken the frame right where the motor mounts. My front case mount developed a nasty crack in it on the left side where the stud screws into the block. This has to be the weekest part of the case and it's right where it needs to be it's strongest. I fixed it by making a solid mount and replacing two of the case's screw's with grade #5 studs and bolting my new bracket to it on the left side. This is on a Schwinn Jag with a steel frame. New mount will also work as a torque strap. I had all the welding done for 20 dollors at a local sheet metal shop. Even if you don't use this method for your fix at least get the holes welded shut, it could save your life! Here are some Pic's this is a work in progress but I used this new bracket with it mounted through the frame and it worked fine (the crack in the case did't get any bigger after two tanks of gas) I can't fiqure how to post pic's and its late tonight I will try again tommrow. I can't fiqure out how to down size my files to post pic's or why it's asking me to. I've posted lots of pic's on other site's with no problem. Can some one explane how to do this.