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Awesome! Glad you found everything helpful here I'll be back in the shop soon too, so more will be up as progress carries on. Hopefully this makes things very easy on your end!

650mod wrote: Awesome! Glad you found everything helpful here I'll be back in the shop soon too, so more will be up as progress carries on. Hopefully this makes things very easy on your end!

The pictures help lots, I'll be trying to copy your top shock mount, or something very similar. By the way what was your total offset measurement for the front sprocket, I'm getting 5/8 but it's hard for me to tell being that the swinger I have is so stretched Im having a hard time with finding a straight edge long enough to get a nice measurement !

don't overlook using a string as a straight edge.

remember the term"straight as a string".

leon

Yepper, use some bright colored dryline (masons line). Very strong and stretchs out nice and tight.
Wayne

531blackbanshee wrote: don't overlook using a string as a straight edge.

remember the term"straight as a string".

leon

Jmoney: I'm unsure of total offset right now- but I'm thinking I'm somewhere around 5/8ths. I've shaved 1/8th of an inch off my cushdrive to let the chain ride in closer to my tire. I'm hopefully in the shop over the week, so I'll have the sprocket all welded up then and I can get a rough idea. But I think I'm going to be somewhere around 5/8ths or so- seems to be the standard offset.

And fully agreed with Leon and Wayne- the string is a quick way to see if your chain has any pitch in the middle (left to right misalignment).

Devin

Looking good Devin. Please do keep us updated on your progress.

your 78 Fighter conversion is being featured in the BikeBuilds.net
directory here: 650mod's 78 Fighter build

We’re currently displaying only a reduced-size photo (similar to what you’d find in Google
Images). We'd like to ask for your permission to publish the original full-size image with your
build listing.

If anyone would like to have a build of their own listed, just send me a message with a link to
the build thread and we’ll take care of the rest.

Al

Hey Al!

Absolutely, feature whatever you would like on the site Giving people tips on their builds is always welcome. Hopefully this weekend I'll be back in the shop, The summer was super busy for me, so winter will be my crunch time to get her done. Thanks!

Devin

Alright, guys. I'm back! Things got super busy for me in June/July with my Master's Thesis work, but that's COMPLETELY out of the way now Now I have more time to focus on important things, like building bikes

I got into the shop today with my welder and we tackled the last really large bit of the build- getting my offset lined up properly and welding up the sprocket. We decided to take the cush drive off again, and shave even more meat off of it to get the sprocket to sit closer to the tire, In total, we've shaved 1/4" off the cush to drag the chain closer to the tire. Total offset on the sprocket is 21/32", a little more than 5/8ths said and done.

We got the cush off, took the sprocket lugs out, and threw it in the lathe to shave another 3/16" off it.



After that, we put a few of the sprocket lugs back in, put the wheel back on, and checked to see if we cleared the frame and tire- we have about 1/8th of an inch on both frame and tire side- perfect!



It was then time to weld the sprocket up and get this thing solidified.



I'm really happy my friend is helping me out so much with all the welding- I couldn't ever weld this smoothly. He does amazing work. Picture of the outer face of the sprocket.



Picture of the inside face of the sprocket. Nice smooth beads.



We went to move onto getting the foot rests sorted out, but I forgot some of those pieces at home... This will be the job for next time.

Maybe Leon can answer this one- when it comes time to harden the sprocket up, I think you said to heat it cherry red then dunk it in a bucket of oil/mineral oil?

I should be back in the shop fairly quickly as I now have plenty of free time to spare Updates should be up more often.

Devin

devon,
i heat it to a deep cherry red and then holding it on a j bent piece of tig wire which is 36" long or so i dunk it into a bucket of used engine oil that i have.

p.s.
that sprocket turned out very nice.


leon

Thanks for the refresher, Leon. That will be the next thing to do once I'm back in the shop to finalize that bit.

After that, it's on to the foot rests and a few other smaller (but still fab related) things to finish it up.

Devin

Another quick question for anyone that's had to mount up new footrests (specifically off of a newer bike). I'm mounting up rearsets off of a '99 ninja 900 to the bike. I've seen a few posts on here where there was basically an adapter plate made that was welded to the frame that holds the rearset mounts. If I remember right, the flat plate has to be roughly as thick as the bolt I'm using is wide, correct? This would mean I should use around 3/8ths inch plate steel to weld to the frame, then have two holes drilled and tapped on the back side to hold the rearset, right?

Thanks in advance guys.

Devin

a good rule of thumb is that a bolt need as much thread engagement as it is in diameter.
so if your mounting with 3/8's bolts the plate needs to be 3/8's thick.

i'm getting ready to mount the rear sets on the kz750 i am doing the arm for and plan to use 3/8's thick material myself.

hth,
leon