Topic: frame mods- performance wise

[greasy j]

have you noticed there is no frame section in the FAQ's?

I'm completely redoing my bike. from 750 to 850, porting, cam, etc. (prob use cycleX git kit #2) better brakes, GWing front end, better rear shocks, 18" wheels.

what can I do frame wise. I know racers stiffen their frames by gusseting. does this help a lot. my bike wobbles right now, but I have a bent fork and #$%*e rear wheel.

the guy who had it before me bought it new in 71, original owner! he was kind of an old drunk, though and would drive home from the bar and tap it with his truck sometimes cuz it shared a parking spot. if it was ever hit hard enough to tweak the frame how would I know?

so basically- can I check my frame for straightness when all is off of it? what are the best ways to improve the frame strength?

I now have access to both kinds of welding machine. my girlfriend's sister builds hot rods and has some #$%*in equipment. so I can do it if need be.

[Whaleman]

I have heard the old roadracers used to double up the two triangular engine mounts for a stronger mount. Dan

[Ecosse]

i can't remember how it's done but a few here have checked their frame for true-ness during a rebuild. so it can be done. one area i've seen gussets is in the triangulated area where the oil tank, battery area is. also, transversely above the swing arm i think. mcrider has done similarly to his p2 project, look for his build thread.

also, the area near the head stock could be reinforced.

[bucky katt]

the only frame mod i've done (so far) is one of the removable top rail kits from Ilbikes (gordon) if he still has any left theyre worth every penny if you have a cb750. no more removal of the engine to do top end work. when do the big motor i'm going to start looking at more performance/safety mods for the k4

[Ogri]

Voxonda in Holland sells beefed up engine mounts

 http://www.voxonda.com/index.php?page=shop

(scroll down 8 pics)

[greasy j]

thanks you guys. seriously considering Gordon's kit.

[bucky katt]

that kit has been a godsend for me. i've had to take the top end off 3 times since i put the bike back together.

[greasy j]

that kit has been a godsend for me. i've had to take the top end off 3 times since i put the bike back together.

you know i actually new that. spend enough time reading these forums on a sunday and you get to know everybody's trials and tribulations.

[srook]

Here is an excellent article on the principles involved in frame stiffening http://www.tonyfoale.com/Articles/Frame.mod/KawaMods.htm
Scott

[ColinMc]

I can't recommend frame straight systems enough. I've had them straighten motorcycle wheels (magnesium ones too!), check my ducati frame to make sure it was true, check my cb750 frame to make sure it was true...etc...etc...great service every time for me.

http://www.framestraightsystem.com/

The web site isn't super professional but they know their stuff that's for sure. They won't reinforce your frame last i knew, but they can check it to make sure it's true, and fix it if it isn't. IF you plan on doing any welding on your frame, have them check it AFTER. That's what I did. After cutting and welding in the Gordon frame kit I had them check it. Came back well within spec...surprising to me lol.

[oldfett]

So do you have to crate your frame to them? I probably don't want to know but how much did it cost in all (including transport)?

[ColinMc]

I just wrapped it in bubble wrap...like 15 layers lol, put chunks of carboard over the areas that could poke through if it was tossed around and wrapped it in the industrial shrink wrap looking stuff and sent it UPS. Was maybe 50 bucks to ship at the time?

My ducati frame was cheaper since it's smaller and lighter.  That cost maybe 40 bucks?

[Ecosse]

frame straightening threads:

http://forums.sohc4.net/index.php?topic=14445.0

http://forums.sohc4.net/index.php?topic=33474.0

frame bracing:

http://forums.sohc4.net/index.php?topic=27624.0

http://forums.sohc4.net/index.php?topic=43997.0