Topic: Delkevic Exhaust Fitment issue

[Ericcb750]

Hey Guys, I picked up a Full Exhaust from Delkevic back at the end of the fall and just recently fit it up to my 1978 CB750K. THe pipe is very nice polished stainless, collector held on by springs, and a nice muffler (i got the straight version, not the Megaphone style)....

Although beautiful, I'm having some serious issues with the fitment of this thing and wanted to see if anyone has run into issues and how they were resolved..... The headpipes fit perfectly and same with the collector and the springs.... The issue is when I put on the Straight muffler, The pipe sticks Way too far out to the right and literally cannot be bolted up to the frame using their brackets and sure as heck can't use the center stand stop.

I've watched plenty of videos and seen plenty of photos and most seem to be able to mount them nicely. Been going back and forth with Delkevic for about a week now and starting to get pretty heated with them....I wanted to see if anyone has had this issue, it's like the "elbow" portion of the collector is not bent enough or was welded on incorrectly or something as the muffler doesn't hug the frame like other photos i've seen.

Thanks for any help if someone has dealt with this.

[flybox1]

How about some photos of what you're looking at....

[evanphi]

Use some nickel-based anti-seize (good for exhaust joints) on all the joints so it is easier to tweak once installed. I found mine slipped further into the collector once I had some anti-seize on.

Also agreed with flybox1. Needs pics!

[drumstyx]

Just put mine on my '78 -- it came with brackets labelled for xs650 or something...one is an offset piece for mounting to the footpeg hole, one is an extended centre stand stop which is *just* long enough to clear the chain.

I believe I had to either go without a washer or use a narrower one on one of the bolts. I *had* to assemble the whole muffler+offset+stop off the bike, then I simply hooked the offset to the footpeg.

If yours didn't come with those extra brackets, I'd contact them.

Honestly, I was a bit disappointed about that too, but for the price, and the quality, and OMG the sound....I can't complain.

[Ericcb750]

THanks for the help fellas, I'll get some photos up right away.... Maybe i'll try assembling it off the bike? It did come with a few different brackets and i'll post photos of everything.

The pipe is super nice for the price especially and everyone else seems to be able to get them to fit well. I'll post up some photos and try assembling and then installing it?

Drumstyx....if you happen to have the same one with the "straight" muffler, and it's on a 78 that could be a huge help! Do you think you could either e-mail me a couple photos or text them to me when you get a moment? i'll get some photos up.

Thanks guys.

[Ericcb750]

Here we go

[flybox1]

is your mounting bracket flipped 180deg?

[CBGhia]

is your mounting bracket flipped 180deg?

^this.   It looks like the pipe is sitting exactly where it is supposed to. 

[Ericcb750]

I wish it was flipped... it's weird it's like the angle of the outlet (that the muffler attaches to is off. Like when I put the muffler on which is 100% straight it sticks wat too far away from the frame.... it's strange.

I just didn't know if ther was some trick for this...

[Ericcb750]

From a couple videos I've seen it looks like it should be much closer to the rear passenger mount.... trust me I'd love to find out I'm just doing something wrong here...

Here a photo from online SOHC cb750 (earlier model) but identical pipe...

[flybox1]

Wild guess....but what about an error at Delkevic in labeling inlets at the collector?
(like if it should be 1-2-3-4 and they labeled it 4-1-2-3)

[Ericcb750]

Thats kind of what I'm leaning towards myself..... But they wanted nothing to hear about it... The tricky thing is too the little loops for the springs... I'll pull it all off and try to refit the collector regarding what you just mentioned (without the springs) and that will help prove that point or not...

Thanks guys, I just didn't know if there was some little step i was missing.

[robvangulik]

Did you send these pics to Delkevic too?

[Ericcb750]

Yeah I have been in contact with a woman there who is extrememly nice but i'm starting to loose my patience.... She keeps spouting off part numbers and telling me those part numbers are supposed to fit. I've been very nice to her because this is obviously not her fault, However she keeps telling me the exhaust must not be installed correctly.....I have installed many exhausts and built bikes top to bottom....Anyone looking at this thing in person can tell something is not right.

So we'll see how that ends up but i'm extremely suspect of the angle on that collector.....if it was grabbed on the end and turned clockwise just a bit, it would bring the muffler up and toward the frame allowing it to mount up...Unforutnatley since it's welded together that cannot be done.

I'm going to take it all apart again tonight and try seeing if somehow the collector was numberd incorrectly or something. HOpe i can figure this out.

[drumstyx]

IIRC, the early models mount differently than the 77-78 ones, so that might explain what you see on youtube.

I sent you pics via email of my setup -- it looks like the muffler mount is actually in a similar spot, but like I said I had to use brackets it came with labelled for some other bikes. I do have the longer muffler though, but it looks like the 2 bolts are in the same spot.

First and foremost though, did you already tighten the headers to the head? Because that could be your problem -- you've gotta leave them loose while you fit other things, because they aren't a positive fit like modern bikes/stock exhausts.

Also, while you shouldn't need to adjust THAT much, the kit comes with milled aluminum spacers to move things around if needed.

All that to say, 'plug and play' means something a little different for 40 year old bikes than modern ones, I think

[Jerry Rxman Griffin aka MuthaF'er]

After seeing your dilemma I took a look at mine. No muffler YET. Does your muffler have any bend at the collector or is it just straight? My collector points outward which would point a straight muffler outward also. I'm hoping to get it together enough eventually to ride up to Delkevic's office and look things over. Last I spoke with them I was given a part number for the 'straight' muffler but I couldn't locate it on their site?! I'm hoping it's a bike specific CB750F match.

[Tews19]

Your mourning bracket is backwards. You also need the spacers they provided .  It will work. I had the same issue when I mounted mine.

[Jerry Rxman Griffin aka MuthaF'er]

Can you post up a picture Tews?

[Tews19]

Here it is.

Sent from my SM-N920V using Tapatalk

[Tews19]

The bracket doesn't mount to the exhaust .  It mounts to the foot peg hole. Then with the spacers next the bolts mount to the exhaust.

[chewbacca5000]

The bracket doesn't mount to the exhaust .  It mounts to the foot peg hole. Then with the spacers next the bolts mount to the exhaust.

That is how I did it.  Flip the exhaust  180 degrees, make a center stand stop, a spacer, and a strap to connect the bracket to the footpeg.

[chewbacca5000]

You could also get a 16" strap and bolt it to the shock mount old school Kerker style.

[greenjeans]

The bracket doesn't mount to the exhaust .  It mounts to the foot peg hole. Then with the spacers next the bolts mount to the exhaust.

Mine too.

[Jerry Rxman Griffin aka MuthaF'er]

Thanks guys. I have to address this issue soon as well and install the center stand stop. My header came with spacers and a center stand stop. Don't do too much good without a muffler also LOL. The only downside I see with Delkevic is lack of instructional material. 

[drumstyx]

So...do they just throw in a couple random brackets and spacers and call it a day? At least for the '78, like I said I used brackets for I think yamahas. It fits without spacers, but still kinda funky that I got those brackets, and nothing that looks like what OP got at all...