ATC110 motor mounts broke

[tundrawolf]

I needed to get out of a ditch, and the only way out was a pretty steep hill. I took the hill, but the ATC ended up wheeling backwards at the top, and it fell on me and rolled back down the hill.

Recently during a nice trail ride, I heard a strange sound coming from the front. So I looked and discovered both of the cylinder head engine mount tabs had broken off!

I decided to go over the ATC and check everything. I found that the left hand hub was very loose, and the other two engine bolts were also loose. I was pretty surprised to find all of this wrong.

So here is what I did.

Here are all of the pieces laid out. Look at the two jagged shaped pieces I cut out of some metal stock:



Here are the pics after I welded the scraps onto the bracket:













I had to do some clearancing on the gusset pieces but it worked out very well.

On the bike:





This bike rides like a tank, now. It doesn't slide all over the dirt like it used to, and I can actually make corners now! I think that the tabs were either already broken or very cracked because it has never handled this good before.

[Vealmonkey]

I would seriously look into replacing that mount with a better one.

[atc350xer]

Is that red RTV all over the intake? Oh, and a new motor mount from ebay would be very inexpensive... I may even have one I can send to you for shipping, lemme look.

[vanaman]

i see you like rtv

[ratvespa]

that should work. they don't technically need the front mount, although it's a really good idea on a 3 wheeler or any off road vehicle. lot of the street vehicles honda sold with these style motors did not use the front motor mount, but there is a good reason honda put them on there. Did you check the rear mounts? and if the bolts are tight? Loose bolts could of caused the front mount to break.

[ratvespa]

i see you like rtv

haha, thats so common on those 70/90/110 motors, everyone over tightens the intake bolts and strips it out. I have been lately putting time certs in the intake and exhaust stud before they strip out, so I don't have to deal with extracting a broken stud or bolt. People forgot those little M6 bolts are only supposed to goto >90 INCH pounds.

[tundrawolf]

I ended up using nuts and bolts to secure the carb to the intake and studs to secure the cylinder head to intake. I did not want to mess with it so I gobbed the rtv on it just in case.

Those gusset tabs are almost 1/8" thick, that mount is 15x stronger than stock.

Also, this mount alone accounted for 75% of my cornering and handling woes. This bike handles very well now that the mount is repaired.

Thank you for the offer though I appreciate it.