The Barzu Bike - XJ750

???WTF is an unobtanium spark plug. I used to work at a cycle shop and have a degree in auto tech. I like to think that I keep up on new products but I've never heard of such a thing.

The highest quality plug I've heard of is iridium. The plug for your bike is a NGK BPR7EIX

If you read about these "unobtainium plugs" on a forum, you may check out this link Unobtanium

 

Earz,

I was just screwing around. :mrgreen: It's my play on iridium plugs.

Actually, I'm surprised that the term IS used in manufacturing and materials. The "unobtanium" joke started back when I was 20, working in Philly, and one dude was bragging that he just got a Platinum credit card.

Well, my friend Bobby and I did not like this dude so without missing a beat I looked at him dead serious and I was like "PSHH! That ain't nothin! I've got an UNOBTANIUM card."

Very funny, if you were there.

Thanks for the Wiki link, I think that completes the funny.

 

HAHAHA, is you bike running yet? LOL

 

Some of the parts for my old Challenger R/T convertible were considered unobtainium back in the day.

 

I bought some unobtanium spark plugs and now my bike actually hovers a few inches of the ground when I ride it.

 

I'm so jealous. I cannot afford them.

To update, I colortuned the bike today and took it around the block. Idles great, rides great and no more black spark plugs. I cannot believe my air jets were reversed.

From here on out, it's minor tweaking until winter.

My bro and I are going for a ride in a bit, this way I can get her fine tuned.

If you see us out there, throw up some gang signs! We'll holla back.

I'm the one with the skulls on the helmet on the loud beast. My bro is the "douchebag on the scooter." (his words)

Peace :twisted:

 

LOL well I'm glad you got that sorted out. Let me know how she runs.

 

Alright d00dz,

Just got back from a two hour ride. Here's the verdict:

The header pipes are loud. Holy loud. I swear the sound travels right up the helmet into my ears and nowhere else. I can handle it, but I'm sure tinnitus won't be that far off.

I'd like to find a pipe shop that would bend me four custom tubes (two on each side) in a shotgun fashion to the back wheel. I'd like to go over/under right in the middle of the bike, right about where the current pipes exit from the engine.

The bike screams when you open the throttle from 1 to 4K rpm. Then it gets too much air and bogs down. I know why.

When I called DynoJet and told them of my woes, (before I knew my air jets were reversed) they had me move the clip on the needles. I've got to move the clip back to where it was because now there's not enough gas getting in there from 4K rpm on...

Once I get the needles in place, I'll colortune again, carb sync again, and should be good to go.

 

damnit barzu!!! i was coming to post a "HAHA i beat you" but it looks like you were riding yours as well.

funny, i was going to say my pipe is too loud! open primary tubes just seems like it should rattle your bowels out.

so how many dirty looks did you get with the open headers?!

 

Let me know when you want to get out again. I am diggin' this nice weather.

 

Cooter, I'll be ready to go next week. I just want to raise those needles by a clip and tune it again. I'll get all the minor stuff ironed out this week and we'll figure out a ride. My bro will come as well.

Zookie, I gotta tell you dude, they're soooo loud. My bro was riding behind me and said that every time we passed a car, they all immediately followed me with their eyes.

We stopped for gas an a 12some of harley riders pulled up to gas up and buy laxatives or something. When I fired my bike up, I got their immediate attention.

I laid off the gas while passing the PO PO as well, just in case. If they were trying to pull me over, I wouldn't know because of the pipes. Aaaand I can't see anything out of my mirrors...so my bar ends are on the way.

 

so are you going to keep them zoomies, or change to something a little quieter? :lol:

 

I'm keeping them the way they are. I'll try to find some place that bends pipe over the winter and do the shotgun over/under on each side. In the mean time, they'll have to do.

Some dude in our subdivision got creamed on his orange crotch rocket by a minivan mom. Seems like he tried to pull out and didn't pull out in time. His leg was bent the wrong way. Jeez.

 

are your guys carbs CV carbs as well? if they are this may help you if you have the dyno jet kit.

http://www.factorypro.com/tech_tuning_p ... gines.html

this guide from factory pro is not factory pro product dependent. you just may have to mentally adjust the RPM ranges mentioned in the guide.

 

Very busy but time for an update. I've had the bike out a couple of times. I just changed the needle positions to what I had them at before.

I think I'm getting used to open headers as they don't seem to be so loud anymore. Either that or I started to lose my hearing already

I decided to take the tank off and put the final couple coats of paint on it. I've got this week to tune and am going for a long ride with some dudes on Saturday.

But it never ends...now my headlight and (running) tail light won't come on at all. I've checked the bulbs and the filaments are intact. This probably means that I have to take the electrical leads apart and hit them up with some fine grit sandpaper.

Feel free to chime in.

 

Barzu, check your fuse inside the headlight bucket, light blue wire goes to it I believe. That should be it. Did you replace any turn signals lights lately?

 

Xulf, dookie!

No, did not replace turn signals. Changed that fuse because it was indeed shot, and I got a new bulb just in case. Still nothing.

I really did not want to delve into this crap until winter...jeez.

To clarify, I have no running lights. Turn signals work great and the brake light does come on when the foot pedal or hand lever is depressed. Why me? Whhhhyyyyy meeeeeeeee? :cry:

 

Not sure if you have a wiring diagram but I found this one. It's for a UK model but most of it should be the same. Hope it helps.
XJ750 wiring diagram

 

Thanks Earz,

Here's my gifts. Scroll down to the bottom after clicking the link to download it. Enjoy!

Filename: YamXJ650750HayMan.pdf (174MB)
Download Link: http://www.filefactory.com/file/a0b7egg ... HayMan_pdf

Filename: Honda_CB750SC.Nighthawk_84.pdf (13.99MB)
Download Link: http://www.filefactory.com/file/a0b7d21 ... awk_84_pdf

Filename: CarbElecMan.pdf (61.93MB)
Download Link: http://www.filefactory.com/file/a0b7e5d ... lecMan_pdf

Filename: MotoMechMan.pdf (45.06MB)
Download Link: http://www.filefactory.com/file/a0b7e7e ... echMan_pdf

Filename: CarbMan.pdf (20.34MB)
Download Link: http://www.filefactory.com/file/a0b7eh8/n/CarbMan_pdf

Filename: Motorcycle Mechanics General Manual.pdf.pdf (45.06MB)
Download Link: http://www.filefactory.com/file/a0b7f14 ... al_pdf_pdf

Filename: YamXJ650750ManPt1.pdf (76.53MB)
Download Link: http://www.filefactory.com/file/a0b7fbc ... ManPt1_pdf

Filename: YamXJ650750ManPt2.pdf (38.45MB)
Download Link: http://www.filefactory.com/file/a0b7feb ... ManPt2_pdf

 

Went riding yesterday with four other dudes. Ended up putting 400 miles on the bike. Wow, I was NOT ready for that, and my body is very clearly telling me that this morning.

The header pipes will not do at all. My ears are still ringing. Fortunately, one of the dudes I met yesterday is a pro welder and has a shop, so I'm going out there and we're going to lengthen these pipes to the back tire.

Originally, the header pipes were not that high on the priority list, but after yesterday, they just jumped up to number one.