How To: change a j rear to a b rear - ZX6R Forum
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post #1 of 65 Old 01-29-2012, 06:49 AM Thread Starter
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How To: change a j rear to a b rear

there are 2 ways of fitting a b rear end on a j model
the first way is to cut and weld the rear seat frame
as you can see the j frame in black is longer and thinner than the b frame in silver


so if you go the welding route you will need to adapt the b frame (silver one) to the same width as the j frame (black one) hence cutting and welding the frame

if you cant get hold of a tig welder here is another route
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Last edited by scoobs; 01-29-2012 at 08:00 AM.
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post #2 of 65 Old 01-29-2012, 06:49 AM Thread Starter
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dont wory there is another way ....adapt your j frame to fit the b plastics on

first get you j frame and cut the end off it so it is the same length as the b frame
like so
for the lenght that needs to come off is about 1.5 inches .....that will be making the cut just back from the cross brace .....
as the picture shows




also you will not need the old handle brackets ....cut them off



now flip it over and chamfer the rear section down as in the pic

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Last edited by scoobs; 01-30-2012 at 12:29 PM.
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post #3 of 65 Old 01-29-2012, 06:50 AM Thread Starter
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on the b frame you will see this metal bracket welded on the rear .....grind down the welds .....it will come off

and you are left with this



offer it up to the rear section of the j frame and on the cross brace there is a couple of holes .....it will line up with those you might have to elongate the rear hole but it will go on



once that is bolted on you will have to bend up very slightly the ears at the end of the bracket ....just with a pair of pliers .....will be fine (remember just a tiny bit)

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post #4 of 65 Old 01-29-2012, 06:50 AM Thread Starter
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half way down the B-frame you will see these brackets
you want to replicate these on you modified J-frame



so screw the top section of your new rear end on the rear bracket like this




you will see were the plastics will connect onto the brackets what you need to make up so mark the frame and take the plastics back off
its an easy bracket to make needs to come out 15mm from the frame .....you will need a a 10mm drill to drill the hole in the middle of the bracket where the rubber grommet will fit in to hold the front section of plastics
drill a 6mm hole through the frame and bolt the bracket on with a nut and bolt .....in the picture you will see a Coach Bolt with a flush head

Last edited by scoobs; 01-30-2012 at 04:57 AM.
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post #5 of 65 Old 01-29-2012, 06:50 AM Thread Starter
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looking down your frame you will see your old brackets on there that use to hold your original plastics .....you dont need them .....cut them off


on your rear bracket you will notice there is a slot that is for your boot lock ......mark it out and cut the slot out in the cross brace
so it looks like this


so now it should look like this with your 3 brackets holding the rear section on
dont worry if its slightly out as being mainly bolted via the rear bracket you can just adjust it to get it all straight


Last edited by scoobs; 01-30-2012 at 12:01 PM.
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post #6 of 65 Old 01-29-2012, 06:50 AM Thread Starter
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you will see half way down i have made up some brackets that hold the top of the boot section
if you make the holes slightly oversized where the brackets bolt into the frame ....
you can adjust them to get the seat hump lined up correctly



as you can see they lock in and fit a treat .....photo from underneath looking at the brackets locking in





so thats it



and what it looks like with the lid on



note these are the only 2 screws that hold the plastics on the rest are clips on the (front end)


note : you will need to fit the B series locking mechanism to lock the lid(rear seat cowl) down ...bolts that hold the rear bracket on go through the cross brace and then will also go though the boot lock ........thats why the slot is cut out in the bracket(if that makes sense)

Last edited by scoobs; 02-03-2012 at 05:00 AM.
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post #7 of 65 Old 01-29-2012, 06:50 AM Thread Starter
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now its just a case of paint the rear and fit it to your bike
with the modified frame

and what it will look like with the plastics on


to get to this stage ......should take no less than a couple of hours if you are competent in the workshop

as for the black battery holder for the j series ....where it bolts onto the rear frame just behind the electrics cut it off just rear of the bolts ....dont need to put a photo up for that as its self explanatory

you now have 2 options for the seat you can make a new seat base up or use the original b model seat you will have to modify the seat brackets .....but not by much
for my bike i decided to make a seat base up
i used the front corners and lines from a j series seat and the rear and sides from the b series and a tub of the loveliness known as fibreglass

after its all dried fibredisc it down and you are done with the base



and now its just trimming the seat ....im pretty tall so i wanted a thicker seat ....so after trimming it with new foam and also i made a new cover ......this is the outcome .....this part really is down to you .....you can decide what you want to do with your seat .....



Last edited by scoobs; 01-29-2012 at 03:12 PM.
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post #8 of 65 Old 01-29-2012, 06:51 AM Thread Starter
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it is now wiring tidy time
on the j series the cdi unit sits on the outside of the frame ....this is now a personal preference as i dont use the boot area and have no pegs on the rear as i dont carry any passengers .....i put the cdi unit in the boot on a bracket i knocked up quickly .....(just extended the wiring by about 7 or 8 inches)
(note the loose wires with blue tips are for the rear light)



now the mock up is all done and you are happy with it
its time to slap the paint on the plastics


when its all painted just fit the bike together

Last edited by scoobs; 02-05-2012 at 11:17 AM.
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post #9 of 65 Old 01-29-2012, 06:51 AM Thread Starter
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so you have now successfully changed the rear of your bike

from this


to this



note the under panal and rear light is fitted ....its just all black so its hard to see
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Last edited by scoobs; 01-29-2012 at 10:53 AM.
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post #10 of 65 Old 01-29-2012, 08:00 AM
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That's a great how to thread Mark, We should see if we cant get it made a sticky.

Its good that you have done this, yesterday with the back & forth with Blazen,
It occurred to me that we were really polluting a good thread with a load of nonsense.

I'll keep the none bike stuff out of my post here. Good job mate.
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post #11 of 65 Old 01-29-2012, 08:19 AM
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Good stuff mark! That B rear does look loads better i must say.

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post #12 of 65 Old 01-29-2012, 08:21 AM Thread Starter
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yeah i realised the thread was getting abit polluted ....
so thats the reason as its just makes everything clear for everybody that wants to convert there bike over

cheers guys ....i like the new look gives the bike a sharper look

sorry about the bush getting in the way .....photography isnt my forte .....lol

Last edited by scoobs; 01-29-2012 at 08:23 AM.
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post #13 of 65 Old 01-29-2012, 08:23 AM
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Eventually Joan will get a new ass too.

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post #14 of 65 Old 01-29-2012, 08:26 AM
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Nice one mate, quality write up.
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post #15 of 65 Old 01-29-2012, 09:12 AM
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Nice work man. Interesting read.

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