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Classic Bike Trackdays

1988 ar125 b2 rebuild :) very photo heavy
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Tue Nov 10, 2015 1:00 am    Post subject: Reply with quote

https://youtu.be/0JiVXAESv1U
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Tue Nov 10, 2015 1:08 am    Post subject: Reply with quote

ive manged to get to paint matching the original originaly the paint was like metal flake on this bike (although on the photos you cannot really see)
so once ive done the body work and i get a dryish day to put the bikes out to paint everything

then its
do the brakes
tyres (probs last)
paint wheels
refit some parts
battery
sort water leaks out on the pump
either paint or lacquer the exhaust
paint and decals
recover seat

and see if the flat running problem it has is sorted (may have been a plug and a jet )

also ive got a b7 to rebuild and will sort afew things with my A1 then ontop is rebuild a nissan datsun d21 so it ma be still a little while lol
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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The Cameraman



Joined: 22 Aug 2015
Posts: 608
Location: Lancashire

PostPosted: Tue Nov 10, 2015 6:49 pm    Post subject: Reply with quote

Hi AR-jack,

bloody brilliant to see another AR125 getting some TLC.
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Reggie
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Tue Nov 10, 2015 7:32 pm    Post subject: Reply with quote

thanks Smile

this is 4 of the AR line up minus the A model without reg (its in the celler haha)

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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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The Cameraman



Joined: 22 Aug 2015
Posts: 608
Location: Lancashire

PostPosted: Tue Nov 10, 2015 7:47 pm    Post subject: Reply with quote

Hi AR-jack,

nice fleet you have there!
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Reggie
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Top-shaggy
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Joined: 05 Mar 2011
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Location: Derbyshire

PostPosted: Tue Nov 10, 2015 9:34 pm    Post subject: Reply with quote

Great line up Jack... You seriously could be the next biggest AR125 geek ..erm..ummm after meeeeee haha

Fun watching your videos too, the Nikkon and Gibson sound completely different don't they ..

The Gibson sounds more like the standard exhaust whereas the Nikkon seems to cackle and spits like a rabid rat Smile

Did you give them a run out to see how they compare on noise, grunt and power delivery? The original Nikon (note only one K) was a very good exhaust for top end power. I haven't got one of the newer Nikkon ones ..

Looking forward to your next update Smile
Very Happy
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Tue Nov 10, 2015 9:51 pm    Post subject: Reply with quote

thanks!

the nikkon does not fit the b2 now but the gibson does and at the same time the gibson does not fit the the other ARs properly

the nikkon was loudish on the b2 but even louder after it was fitted to the rebuild engine on the A1 but the gibson is more quiet one both almost standard or even abit like a micron without the tiningy bit

the nikkon i was getting a strong powerband at 6kish to 9,5000rpm
and peekinging at 10k 10,500rpm on a standard engine (before it lost aload of compression) and fair bit of low grunt
its not much different on the tuned engine except louder Smile
the silencer on this one is a pain as its ceased together it comes easly off the expasion but the silencer will not come apart to clean at all (newer nikkon seemed to have changed the silencer now?)

i think the best exhaust for a standard is the one on the b4 (came frome the b2) that seems to make the most of the standard engine and got a more savage power delievery

ive still got a fair bit before i can road test the bike so when i do ill update
she's got pretty much no brakes and a leaky water pump lol
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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Top-shaggy
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PostPosted: Wed Nov 11, 2015 6:39 pm    Post subject: Reply with quote

I've never had an issue fitting alternative exhausts to the different AR models so I'm intrigued by the problems you have noticed ??

The only issues in the past have been clearance of the lower fairing / belly pans .. Nothing more

What's the problem ? Header? Mounting points (rear of foot peg / front / back??)

How does your tuned bike compare to the standard bike and gave you set it up properly on a RR as the jetting can be a beggar ?
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fazey
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PostPosted: Wed Nov 11, 2015 6:52 pm    Post subject: Reply with quote

This confused me too. thought they where all the same.
would like to know all the differences from one model to the next.
There is a spare set of wires from the engine on the newer model engine i have.
Also the carburettor inlet is different on the 2 engines.
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AR-jack



Joined: 08 Sep 2015
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Location: durham

PostPosted: Wed Nov 11, 2015 7:37 pm    Post subject: Reply with quote

well the nikkon kept fouling the swing arm one the b2 after refitting the engine the only thing i did was weld a engine mount back on but it matched up and the engine was sitting no problem all of the mounts lined up without problem aswell ( the engine mount was not attached to the bike for a unknown time)

the gibson on the A1 would not seal and kept fouling the engine and bits of the frame/ would not match to the foot pegs hanger right

but when i swapped them the nikkin fitted perfect on the A1 with no fouling and same with the B1 and the gibson sealed nicely no leaks and fits without any pratting on also does not foul

im still confused only other thing is to try a genuine mk1 exhaust on B2
or even the micron race exhaust that was on the A1 before the nikkon
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Wed Nov 11, 2015 7:49 pm    Post subject: Reply with quote

this is the only thing the mount fell off when i un did the bolts








i re alined the mount and used test fitted afew times after welding it and lined up no problem



also both the A1 and B2 are running 1989 engines
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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Top-shaggy
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PostPosted: Wed Nov 11, 2015 10:20 pm    Post subject: Reply with quote

fazey wrote:
This confused me too. thought they where all the same.
would like to know all the differences from one model to the next.
There is a spare set of wires from the engine on the newer model engine i have.
Also the carburettor inlet is different on the 2 engines.


The main difference between early model engines 1982-84 and later model 1984-1994 is the flywheel pick up on the later model engine. This works with the CDI unit of the later engine. Anyone with an early model will struggle to find the CDI (as it doesn't have one..lol). The coils are different.
This may account for the extra wires you have seen ? Unless your looking at the sidestand switch wires on the earlier models too...

Carb inlet is only different due to the shape of the RRIS casing (again no pick up ).. That said the Thai model RRIS is significantly different due to the inlet being made for a 28mm flat slide carb as standard rather than the VM24/26 in the UK.

Hope that helps mate.
Still need to come up and see your amazing frame Smile
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Top-shaggy
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PostPosted: Wed Nov 11, 2015 10:30 pm    Post subject: Reply with quote

Now you say it Jack, I have had a issue with the exhaust being close to the swing arm but never had it foul due to being too close.

This was a challenge with the Giannelli pipe but by loose mounting the rear first before tightening the headers I could 'twist' the expansion chamber to get clearance. Using copper exhaust silicon sorts the leaking header issues - no problem.

With the microns in the past its been very tight trying to get it in the front foot peg rear bolt position but to do that, simply take off the whole hanger, fit exhaust loose, offer to head and finger tighten .. Then refit hanger and tighten exhaust and voila - like the A team its great when a plan comes together (Q music.. Dee de deeee de de deeeeeeee)
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AR-jack



Joined: 08 Sep 2015
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Location: durham

PostPosted: Wed Nov 11, 2015 10:31 pm    Post subject: Reply with quote

also on the old points bikes the frame does not have cdi or reg mountings fitted
and the crank uses a pin instead of a woodruff key

and some harnesses are alittle different due the the removal of the side stand switch on the later models

you can convert the points harness to a cdi using a sub harness

please correct me if im wrong?
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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jack
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AR-jack



Joined: 08 Sep 2015
Posts: 144
Location: durham

PostPosted: Wed Nov 11, 2015 10:34 pm    Post subject: Reply with quote

Top-shaggy wrote:
Now you say it Jack, I have had a issue with the exhaust being close to the swing arm but never had it foul due to being too close.

This was a challenge with the Giannelli pipe but by loose mounting the rear first before tightening the headers I could 'twist' the expansion chamber to get clearance. Using copper exhaust silicon sorts the leaking header issues - no problem.

With the microns in the past its been very tight trying to get it in the front foot peg rear bolt position but to do that, simply take off the whole hanger, fit exhaust loose, offer to head and finger tighten .. Then refit hanger and tighten exhaust and voila - like the A team its great when a plan comes together (Q music.. Dee de deeee de de deeeeeeee)


even on the A1 its very very close i had to adjust the brake rod so it would not touch lol
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ar125 a1 1983, ar125 b2 1988, ar125 b4 1988, ar125 b7 1991, kinroad xt50q 2011
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