750 Maxim Project

another way to increase the air supply to the emulsion tube or needle jet would be to drill a hole in the bottom of the float bowl

 

Slide pegging to the top is MY theory...I could be completely wrong. It's the only reason why I could see a CV carb failing. Don't go drilling holes in anything.

As for the pods being sexier, I think I can assemble an airbox boot clamp with a pleated paper filter glued on that wraps around the boot, giving that sexy pod look to a proper airbox set up :wink: :lol:

 

I'll give that a try and if doesn't work I'll put hole in my forehead and see if that helps.

Manbot, I know that was your theory just getting some more input, you titled it to Rick. I didn't mean to offend just trying to learn about the functions, I read Chacals write up about carburator physics, just trying to gain more insight on how it all comes together to make the bike run.

Form without function is worthless.

 

The Diaphragm Pistons don't open any faster with the Pods on the Bike.
Jet Kit Suppliers used to send a Drill with the Kit and have you Drill an additional hole at the base of the Diaphragm Piston to make the Piston rise more swiftly.

But, the Air Stream entering the Intake Horn is Turbulent and without shape.
Without a Velocity Stack the Air Stream has:
Too much volume
Insufficient shape and speed to lower the pressure above the Emulsion Tube to draw-in enough Fuel from the Main FUEL Jet Supply.
So ... People Increase the Size of the Main FUEL Jet.
They Shim the Needle ...
They alter the Length of the Needle
They reduce the Diameter of the Needle

Non of which:
Provides Speed to a Condensed Air-flow above the Emulsion Tube.

You can hold a Coke Bottle out of the window of a speeding car and not make it whistle.
Purse you lips and blow across the opening and its a different story.

Look at all them light bulbs that just started glowing above all those heads.

 

That intake is nasty! I love it.

 

...I'd steal the idea if I had not already spent $130 on KN pods...

 

Thanks rick I got a glowing light now, I appreciate the help. This is my first time actually trying to tune carburators this in depth.

Thanks Barzu, I can't take credit for the intake idea however I designed mine a bit different than the one I ripped off

 

Here is the spacer on the shock mount koolaid

 

Put 220 miles on yesterday, went on the flood run, through Wabasha up the Wisconsin side to Bay City across to Red Wing and back down to Wabasha and home. No problems whatsoever. Ran really smooth. Saw thousands and thousands of bikes. I have never seen anything like that before. And it was a beautiful day!

 

Thanks for the pic. I'm glad you got to get out and enjoy the bike. I spend the day working in our flower beds

 

When I got my Stage3, the instructions provided only had you re drill the current two slide lift holes on either side. The drill bit enlarged the hold by maybe 1mm?

Should I drill a 3rd hole?

 

I wouldn't

 

after a closer comparison of the shocks you have on there and the ones I THOUGHT were the same and picked up I'm not so sure. You said yours are 10"? The auction title of the ones I got SAID they were 10", but I just measured them and they are really only 8.5" from eye to eye. THey also look to be a bit skinnier than yours. What is the measurement of your coil? I guess just measure around it or something.

Crap.... and I got tank to buy a set too. I hope they work. I'll buy them off of him if they don't, because I feel bad and I'll find a use for them eventually even if they don't work on the XJ.

 

Just wanted to pop in and let you know that I totally love your bike man. Its exactly what I'm aiming for..... so, thanks for sharing all the info you have!

Maybe if I come visit my fam in S.MN I could come take a look sometime.

-Clever

 

hey, I measured those shocks koolaid, they are definately 10" on center, they measure about 2 1/4 inches across on the spring. As long as you don't bottom out hard they should still work even if they are smaller around.

Thanks Clever, you should start a thread when you go at er, I like watching builds on this site for sure. If your gonna be around I don't have any problems showing you the bike. Shoot me a pm if you do.

 

Yeah, I ordered the right ones for tank and I now. The ones that you sent me the link to originally were NOT the ones that you have. I should have looked at them more closely. No big deal though.

 

Oops, sorry, I thought they were I should have looked closer, too. Have you held them up to the bike to see how low it would be? Or would things drag if they were on.

 

Look down at the bottom of tank's thread. He installed them. The shaft was binding, because of the angle and one of the shocks bent a little.

http://www.xjbikes.com/Forums/viewtopic ... rt=15.html

 

Ok got a long winded update about pods and pvc contraptions.. I started with re jetting my carbs in the beginning for pods. I had 132 mains installed and needled shimmed one click up on the dyno jet needle. I never installed the pods to run the bike instead built a pvc intake. The bike ran good except cut out and wouldn't go past 5000 rpms. So in my inexperience I upped the jets to 136. The problem was worsened. I was flooding it out. My pvc wouldn't flow enough air. So, I stepped down to 124. Better, but cut out at 6000, I threw the pods on, it ran better in the top end, but lost a LOT of mid range power. I stepped back up to 132 jets, and stared at the pods, and found the original air box to carb boots. I took the emgo pod apart and the original boot fit snug as a bug, tight even. So, I changed them all and now have velocity stack pods and the mid range returned. No joke. I took it for a test spin and man, I didn't realize how these things turn on after 6500, It is a goer now. I have a couple of stutters at 7500 to 7700 ish, but am going to polish the slides and bores before I jet again. I looked at the plugs and they are a pretty light tan not indicating extreme lean. Just some of my experience and thoughts give me some feedback on your pod tunings.

 

good info brawler.... Question - did you buy a jet kit for this or just pick up a few jets? I'm eventually going to pods myself. I already picked up the pods and got them in the mail the other day and I will have some screamin eagle slip ons in a few weeks as well, so I want to have the jet kit on hand, so I have everything I need. The problem is that I can't FIND a jet kit for an '83. I'm not sure if the one that dynojet lists for the '81-'82 750 would work or not.

Let me know what route you went for your jetting.....thanks

 

I bought the dyno jet kit, are your carbs hitachi? I would say they would be the same but I screwed you up once with the shocks. Get the name and numbers (if any) off the carbs and I can compare with mine or post em up and someone who knows could say.

 

Ok, koolaid the numbers I found in my haynes manual that runs to 84, they are the same carbs. The 750J, has the number 15R00, and the RJ-RH, has the number 5G200, but they both are hitachi cabs model number HSC32. The pilots and main jets are the same for the 750s maxim and seca. Not th uk versions though.

 

AWESOME!!! so we're good from '81-84. Thanks a lot man. I really appreciate it.

 

where did you get the forward controls at? or how hard were they to make??

 

I got mine from TCBros.com I haven't installed them yet, but it looks pretty easy.

 

I made mine out of the original controls, just welded a pipe with a flat plate to the frame, I had to re do the shifter linkage though, not really an easy bolt together mod, fabbing, cutting and welding required.

 

nice job making your own, I thought about it, but tc bros is only 175, ill prolly just go that route and save the headache

 

Painted engine and pipes and a maxim x tach. Done for the summer anyway.......

 

I want some of those back shocks... JcwhitneY?

 

shocks he got on ebay. they are 10" atv shocks

 

Just wanted to chime in and say cool project and AWESOME front end. Love what you did with the tach. Mine's in the same position but without that awesome cover. How does your bracket hold the tach in place?

 

Is that rear wheel conversion you got up front there?

 

yes

 

Hey guys just got the internet again finally at home....thanks for the nice comments, the tach just slides into a piece of driveshaft I had laying around, the rubberish edge covering material holds it in place snug, so far so good. The bracket bolts to where the 750 square-dlebars went originally. Ya the front is the kit you can find info on previous pages of this thread, I use this thread to keep everything in one plce with my progress.

 

- So... hows she ride ??? :twisted:

 

Really good, it is a bit stiff but not bad, the rubber in the shock eyelet broke down after about 300 miles but fixed by putting the stock rubber eyelets in, no problem since, was gonna go on a ride sunday and took it to get gas and the clutch slips at high rpm. I have already adjusted it this spring, I don't think there is much adjustment left...one more adjust and a clutch will be on the list to do. I did get some miles on my stocker though, sunday was beautiful here. I think I am going to sell both maxims and my hardtail 650xs and get a v star 1300. What you guys think?

 

WHY would you sell all your bikes? Don't do it. You at LEAST need to keep one of the XJ's. If you want to add a V star that's up to you, but you can't get rid of all three bikes to do it. My .02

I'M thinking ahead at my next project and I'm thinking of selling my '90 gsxr 1100 to fund it. I only ever had sport bikes before the XJ and even just on the little test runs I've done in the neighborhood I think that the chopper/bobber style is more for me now. I love my gsxr, but ......eh......I don't know

 

Ditto, maybe 1 of them but not both XJ's, these things are to easy to ride and keep on having fun with.

 

Hey koolaid5, why not make a chopper/bobber out of the GSX? :wink:

 

not a chance, but I DO have another gsxr 750 USD front end and wheels that I was going to fit to an '81 cb900f frame. I have the swing arm too and was going to change it to a mono shock .....kind of cafe/fighter-ish. My new idea is to screw the swingarm, hardtail it, solo seat, use the gsxr 1100 wheels and 750 front end, chop the backbone and make it a single backbone, and some drag bars, suicide shift, and MAYBE even a foot clutch, but we'll see. I have just about everything I would need for that project from the titled frame, two motors to choose from, and everything listed above......

 

Sounds like a plan!

 

I don't know. I have a 81 kawasaki 550 to build, I enjoy the xjs just seems like a waste to have more than one bike to serve the same purpose, I guess I could keep the custom one, but if I bought a star I would need the money.

 

And we all now how easy it is coming up with money these days.

 

Streetbrawler, you have me wishing I didn't sell my airbox boots with my old carbs. Now I need to fashion some velocity stacks for my pods using... something.

 

I had thought about using 90 degree pvc elbows on each carb to the pod so they pointed down and that would in turn create a velocity stack in my mind. Got mine working good with the stock rubber so I never tried it.

 

Re worked the Mad Maxim over the winter, wish it was done but getting close. Built a new swing arm 5" over stock, grafted 1100 rear end/wheel. Still need to box in the top of the shock mount.

 

I have fz600 forks/wheel for it. I also have 4 piston calipers off a 1994 fzr600r wich will not bolt on, was wondering if anybody knew where to get adapter, so I don't have to make them.

 

WOW :wink: !!!

skillet

 

whoa how did i miss this? ? that is an awesome bike street! i really love the monoshock and everything!
about the adapters, i have only seen adapters to put on r1/r6 calipers on a certain year maxim (i think).. i had some made for me. i just need to buy harder bolts to mount them.

 

details about the swingarm? im intrigued