Strengthening chewed up lower case

[Al Regresar]

Chain cut loose and chewed up part of the engine case part by the sprocket. To support the sprocket cover, I built up layers of JB weld and pieces of carbon fiber for case support. Thoughts?

 

[GW's Motorized]

You might want to build something to help support that outer cover.

 

[Al Regresar]

You might want to build something to help support that outer cover.

Definitely. I bought one of those chain case guards that are about the size of a postage stamp. They come with 2 small Allen bolts that will go through the material that I built up (1/4 “ thick). The chain took out part of the roof of that outer cover along with the third bolt hole for the cover. That will go back on with a longer bolt that also goes through the plate. I just love playing with carbon fiber to be honest…

 

[gearhead437]

Definitely. I bought one of those chain case guards that are about the size of a postage stamp. They come with 2 small Allen bolts that will go through the material that I built up (1/4 “ thick). The chain took out part of the roof of that outer cover along with the third bolt hole for the cover. That will go back on with a longer bolt that also goes through the plate. I just love playing with carbon fiber to be honest…

Ahoy Al Regresar!
Maybe I missed it, but what is your bikes chain size? I just installed a NIB 66cc Pk 80 engine and the included 415 drive chain. I've logged maybe 1/2 mile on it. The 415 chain is such a tight fit that it "fitted" itself by cutting a small arc into the engine case-Gearhead437

 

[Al Regresar]

It’s a 415 H Japanese chain now. The old one was a 415 Chinese chain that came with the Phantom 85 kit. Yes it is a tight fit.

 

[Al Regresar]

Ahoy Al Regresar!
Maybe I missed it, but what is your bikes chain size? I just installed a NIB 66cc Pk 80 engine and the included 415 drive chain. I've logged maybe 1/2 mile on it. The 415 chain is such a tight fit that it "fitted" itself by cutting a small arc into the engine case-Gearhead437

Is your sprocket true, loose, or aligned? Seems like it shouldn’t be grinding into the case at all.

 

[gearhead437]

If the drive sprocket was made for a standard dimension bike chain, I would have used a spare KMC K1, as was used on my 49cc. There simply isn't enough room inside the bucking bar pivot assembly to prevent this from happening. I discovered this when trying to thread the drive chain onto the drive sprocket, with the spark plug removed and the clutch disengaged Between the 415 chain and the oversized tires, there's just not much wiggle room, fore to aft or side to side. When these tires wear out, I will be replacing them with 26 x 1.75 tires-Gearhead437

 

[DAMIEN1307]

When these tires wear out, I will be replacing them with 26 x 1.75 tires-Gearhead437

Exactly the same size tires that I run with my setup, but I use Kevlar tires and ultra thick Slime tubes.

 

[Al Regresar]

Exactly the same size tires that I run with my setup, but I use Kevlar tires and ultra thick Slime tubes.

I just got the Bell Kevlar Comfort Glides and Slime tubes. + 1

 

[gearhead437]

Damien, perhaps you can IM me the brand tires you use?-Gearhead437