4:2:1 exhaust for 76-79 GS750???

[Chuck78]

Looking into ti welding now for that craigslist setup in the smaller photo. If going for the stainless, these harris ti muffler cans are quite attractive for a late model can, this would help lighten it up a bit to adapt one of these! If doing the ti setup from craigslist if weldable, I could sell that hideous muffler can and get one of these.

EDIT: sounds like welding ti is a real pain the the @#$, can't even heat it and bend it without an argon shield inside & outside the pipe. NO-GO... Maybe for the Harris muffler can, but not a header retrofit.

 

[Chuck78]

Darnit I want this stainless GSXR750 header to be able to be fit to my bike so badly!!! Looks like some work, as I speculated. Some photoshopping with GIMP Image Editor rendered me this. Anyone know if this is a member's bike? I just found an image of a similar bike that I liked a lot to use as an example from google searching. Great bike, and that is a DARN NICE 4-1, better than most I've ever seen on a first gen GS

That is a cutout of the GSXR750 exhaust scaled and overlaid onto a sweet looking first gen GS750. I am thinking that a GSXR1000 exhaust may fit much better, but not certain it would fit in the head ports of the GS750 head. AND I can't seem to find a stainless GSXR1000 4-2-1 ANYWHERE, only Titanium, and Ti is too much work to weld and impossible to heat and bend without severe oxidation problems (over 800 degrees requires complete argon shield and no Oxygen contact with the Ti, & both sides of the weld must be shielded).

I could see myself and a helper heating and bending the front end down so it is laid over a bit more to slide the upswept part back a little, but that will shorten the already just a hair too short head pipes more. I am thinking that it would be possible for me to heat and bend the head piples enough to lay them over forward to a more likeable angle for this frame. Then I would be further off at the head angle by even more though. I could get some .060" wall 1.5" 304 stainless tubing to cut and weld a splice into the pipes to make them reach the head better, but I think the key would be to get the 4' piece of tubing bent into 4 slightly angled pieces after determining the angle needed, and use those as the splice pieces... This is turning into A LOT of work to get the exhaust that I dreamed of having that does not exist... a brand new 15 year old GSXR exhaust for $180 plus about $30 for the tubing, and to do stainless justice, I'd need to buy a Tri-gas mix bottle for my MIG (or borrowed TIG) because stainless welds much better with 90% helium and then 7.5% argon and 2.5% CO2. Standard argon/co2 will give not pleasant looking welds and the welds may rust even when using the proper stainless MIG wire.

posplayr and everyone else, what do you think? I have too much ambition for my own good, and things like this are exactly why I have so many projects backlogged!!! But you gotta admit, pulling off those mods would end me up with the absolute nicest 4-1 exhaust for any 76-79 GS750!

 

[Chuck78]

I think I might have to take the spare frame/engine that I have awaiting a future buildup and go to the junkyard and try out that ZX7 header as well as a GSXR1000 and GSXR750 header...

 

[Chuck78]

Well I've decided against the large amount of work needed to try & retrofit a late 1990's stainless gsxr exhaust onto an older bike due to the difficulty of bending stainless & the hassle of wdlding extensions into the downpipes. The local guy with the vance & hines road pipe got back to me, so I may pick that up for the time being. Seems that there are only 3 new 4-1's available for 1st gen 750's, MAC & Vance&Hines in the usa, & the hard to come by Marving S/54/BC race pipe from Italy. Monster Parts imports Marving to the usa, but only has the cb750 & Kaw versions for about $470. The street pipe looks like tge v&h muffler but the 4-1 headers share a flat single stacked 4 pipe wide 1 pipe tall setupto maximize ground clearance. This is truly the best setup available, & a gsr member who has ran v&h, yoshi, & nos marving pipes on his gs1000 says they flow way better than the v&h and even betterthan the yoshi pipe. The cornering & speedbump clearances are AWESOME on them also.

Their pdf catalog has better photos, butherrs the '79 gs750e header wiyh the race muffler:

Like i said, the street pipe looks like the upswept v&h megaphone. Nice stuff, i want...