Tuning

The place to talk about your Tandem!
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Top-shaggy
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Post by Top-shaggy » Fri Dec 07, 2012 5:21 pm

AR125 disk information here

http://diffrentstrokers.com/phpBB2/view ... f144d2f61e

Sorry couldnt find where i put it on the KR site so link to a different forum but may still be worth a look.

Something like closing the inlet (trailing edge) at 75-85deg ATDC should make a big difference. TSI on this forum may be worth a PM on this one !
:wink:
If it takes more than 2strokes then your just playing at it..

2stroke
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Post by 2stroke » Fri Dec 07, 2012 7:44 pm

Yeah something to play with :-k

Thanks !

dirk
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Re: Tuning

Post by dirk » Wed Dec 12, 2012 3:51 pm

2stroke wrote: ..... It has NOTHING under 3000rpm.....

Any advice will be helpful :)
Hi

i know the problem.
this is the solution:

Image
:lol:

regards
Dirk
TZR250 (2MA) 1987
KR-1S 1990
RG500 1987
RGV 250 1992

2stroke
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Post by 2stroke » Wed Dec 12, 2012 7:47 pm

Nice one dirk :lol:

To anyone who maybe interested.
Our result for carby setting was,
25 pilot
150 main
And needle full rich.

Works fine better bottom end power.
Seems to be harder to start but :roll:

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Luders
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Post by Luders » Wed Dec 12, 2012 7:57 pm

Dirk's words of wisdom did spring to my mind before you mentioned having to slip the clutch.

What were your jetting settings before?

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Post by 2stroke » Wed Dec 12, 2012 9:32 pm

Pilot jet was 45
Main 150 after barrels ported.
Needle in the middle

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Luders
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Post by Luders » Fri Dec 14, 2012 11:23 am

What were the carb settings from factory?

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StrokerBoy
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Post by StrokerBoy » Fri Dec 14, 2012 7:33 pm

Luders wrote:What were the carb settings from factory?
Manual says :

Main Jet 137.5 (range 132.5-142.5)
Main Air Jet 1.5
Needle Jet O - 6
Jet Needle 5DH2-4
Needle Clip Position 4
Pilot Jet 35
Starter Jet 70
Fuel Level 4 +/- 1 mm
Float Height 21 +/- 2 mm
Kawasaki KR250 Tandem Twin (x4) & KS-II 80,
Yamaha RD350LC,
Suzuki GSX-R750RK & RB50 Gag.

2stroke
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Post by 2stroke » Fri Dec 14, 2012 8:15 pm

Have a 150 main and looking at the plug it can still go larger.
Very nice top end power now. Pulls like a 250 should :)

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Luders
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Post by Luders » Fri Dec 14, 2012 10:31 pm

I would always advise sticking with stock jetting. Glad you''re happier with the power improvement though.

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ScottaKR
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Post by ScottaKR » Sat Dec 15, 2012 9:38 am

Luders wrote:I would always advise sticking with stock jetting. Glad you''re happier with the power improvement though.
I would've thought that too till I read this...
2stroke wrote:Main 150 after barrels ported.
Now I understand the reason it was so flat down low in the first place. :roll:
KR250 Tandem Twin (Naked) :mrgreen:
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)

2stroke
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Post by 2stroke » Sun Dec 16, 2012 8:35 pm

ScottaKR wrote:
Luders wrote:I would always advise sticking with stock jetting. Glad you''re happier with the power improvement though.
I would've thought that too till I read this...
2stroke wrote:Main 150 after barrels ported.
Now I understand the reason it was so flat down low in the first place. :roll:
What are you on about?

We bought this bike with no compression and needing a rebuild. Also no bottom end power.
So we rebuilt in,
Porting the barrels not for top end only but right through the rev range. Which it has done.
O-ring the heads to give higher compression which also improves bottom end.

Bike did improve and goes great.

But comments like yours makes me wonder why I bothered sharing this on here!!!

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ScottaKR
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Post by ScottaKR » Mon Dec 17, 2012 9:04 am

2stroke wrote:
ScottaKR wrote:
Luders wrote:I would always advise sticking with stock jetting. Glad you''re happier with the power improvement though.
I would've thought that too till I read this...
2stroke wrote:Main 150 after barrels ported.
Now I understand the reason it was so flat down low in the first place. :roll:
What are you on about?

We bought this bike with no compression and needing a rebuild. Also no bottom end power.
So we rebuilt in,
Porting the barrels not for top end only but right through the rev range. Which it has done.
O-ring the heads to give higher compression which also improves bottom end.

Bike did improve and goes great.

But comments like yours makes me wonder why I bothered sharing this on here!!!
I'm sorry if you took what I said the wrong way, but it was the first time youd even mentioned porting the barrels, let alone how they had been ported. More often than not people will port for massive top end, which is what I had wrongly assumed, but you hadn't really given us much to go on.
KR250 Tandem Twin (Naked) :mrgreen:
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)

2stroke
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Post by 2stroke » Mon Dec 17, 2012 7:48 pm

Cool. Just don't judge before you know the facts.

:mrgreen:

pepsi
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Re:

Post by pepsi » Thu May 04, 2017 5:32 am

2stroke wrote:
Wed Dec 12, 2012 7:47 pm
Nice one dirk :lol:

To anyone who maybe interested.
Our result for carby setting was,
25 pilot
150 main
And needle full rich.

Works fine better bottom end power.
Seems to be harder to start but :roll:
I am trying to remove the bottom end bog, and I have lowered the needle from stock, to the third groove,( will cause more lean conditions in low rpm.) will report back ASAP.

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