KAWASAKI AR125 B7= RESTRICTIONS

[mrlee1974]

Hi all,Ive just bought one of these bikes today(1990-H),can anyone tell me where these bikes are restricted and how to remove? or do you have any good tuning tip's?

Thanks
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Bikes owned,AR50,AP50,RD80LC,DT100E,DT125MX,GARELLI TIGER,CB250G5,XS400E,
GSX400X,CB750K,CB125TDC,GN400,

[kat250]

There are 2 main varients with the ar125, the non uk ones and the uk ones. Iirc the b7 is uk meaning it is about 12bhp unrestricted (maybe abit more) the non uk bikes had a different top end all together different compression ratio and porting im sure there is more but i cant think of just now im sure someone else will be along to correct me.
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in the famous word of jimmy pop "would you F*ck me for blow"
In the words of banditshigh "would you blow me to f*ck"

[mrlee1974]

Thanks for that babykat,I heard that these engines use a disc valve and if I swap that from an engine thats unrestricted it would make an improvement.

does anyone on here have an exhaust laying around for one of these that they want to sell?
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Bikes owned,AR50,AP50,RD80LC,DT100E,DT125MX,GARELLI TIGER,CB250G5,XS400E,
GSX400X,CB750K,CB125TDC,GN400,

[baldy]

Yes, they do use a disc valve. i dont think youll get much more from it, if you were that bothered, you could fit a kmx 125 engine in there.
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One day i will rule the world, just not today.

[baldy]

just out of curiosity, is it green with no stickers? i sold one of those a while back after rebuilding it.
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One day i will rule the world, just not today.

[Kickstart]

Hi

From memory they are restricted by using a different disc valve, a different barrel and a different exhaust. Along with different carb settings to match. Made them probably one of the best sorted restricted 125s but also a very expensive pig to derestrict.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[mrlee1974]

[baldy]

How fast does it go? I got a reading of 75mph on the speedo. i had mine bored out though, because it had been siezed up by the previus owner.
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One day i will rule the world, just not today.

[Kickstart]

Hi

Full power the were meant to do a real 87.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[baldy]

[Kickstart]

Hi

Somewhere around I have a late 1980s copy of PB with a 125 road test. Think the AR managed around 75 when restricted standard (true speed rather than indicated).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[mrlee1974]

Thanks for the info people!

Been trying to source an exhaust all morning with no such luck,I rang a breakers yesterday and found one for £75.Bit steep I thought so I carried on shopping for another without any luck,rang the breaker back this morn (the £75 one) and it's fucking gone!!!

just typical eh lol
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Bikes owned,AR50,AP50,RD80LC,DT100E,DT125MX,GARELLI TIGER,CB250G5,XS400E,
GSX400X,CB750K,CB125TDC,GN400,

[mrlee1974]

[kat250]

Unlucky i had a no bad micron one on mine for abit but was a bugger to set up put standard back on set it up and a junkie neighbours mate stole it never to be seen again along with mircon spanny
____________________
in the famous word of jimmy pop "would you F*ck me for blow"
In the words of banditshigh "would you blow me to f*ck"

[ssray]

The ful power version has a diffrent fuel pump as well, i was a vey naughty learner and bought a full power one as it was cheaper than the 12bhp version.

[Kickstart]

[ssray]

[ar125alive]

The full-power and restricted versions of the AR125 had different disc valves, carbs, oil pumps, exhausts and barrels. Fitting an after-market exhaust, full power disc valve and carb and a performance air filter will offer a major improvement in performance. You don't need to change the oil pump. Just add about 1% two stroke to the petrol. Allspeed or Micron exhausts can be picked up on eBay. Full-power disc valves should be available from Kawasaki dealers. Failing that the resitricted disc valve can be cut. The carb can be more difficult to get. The best bet is probably trying to get one from Ireland. Performance air filters are availble from sites such as bitzforbikes.co.uk - but don't fit one without changing the carb as it won't work. If you do all this it will wheelie on power in first and pull to the red line in top. If it sounds like a lot of trouble, just change the exhaust for the biggest improvement to be had from a single modification.

[ms51ves3]

Clicky

[Avora]

Does anyone know where I can get a decent micron or allspeed exhaust, theres not alot on ebay at the moment and I'm still restricted. Thanks, pm if you have one to sell
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Kawasaki AR125 B8 - Getting ready for a summer time soon!

[P.addy]

[27cows]

I had an AR many years ago. It came restricted but someone gave me a disc valve off an unrestricted one. Added 10mph to the top speed (indicated 70 to 80). To be honest, I wouldn't have wanted to go more than 80 on it, and the sheer level of arse involved in getting another barrel and pipe for a few more mph wouldn't have been worth it.
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The RXS100: vehicle of choice for Chuck Norris