Tuning
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- Light Smoker
- Posts: 44
- Joined: Tue Jul 24, 2012 8:54 pm
- Location: sydney
Tuning
Hi guys.
We need advice on tuning the kr.
We put a fresh top end with much higher compression,
To solve to lack of bottom end but didn't help. It has NOTHING under 3000rpm. We have tried different pilot jets. From 25 to 50 but no change. Main jet is 150. End top end seems to be great ( still running it in).
Okay we don't have exhaust valves but it should be better then this.
Needle position is I'm the middle.
Last resort is trying 32 mm carbies off RGV.
Any advice will be helpful
Thanks
We need advice on tuning the kr.
We put a fresh top end with much higher compression,
To solve to lack of bottom end but didn't help. It has NOTHING under 3000rpm. We have tried different pilot jets. From 25 to 50 but no change. Main jet is 150. End top end seems to be great ( still running it in).
Okay we don't have exhaust valves but it should be better then this.
Needle position is I'm the middle.
Last resort is trying 32 mm carbies off RGV.
Any advice will be helpful
Thanks
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- Avgas Sniffer
- Posts: 3926
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- Location: Oxfordshire
my knowledge of KR's is extremely limited and I've never ridden one, but it is a 2-stroke 250, so would you really expect it to put out any sort of power at 3k rpm?
I certainly get naff all out of my KR-1S engines that low down.
You say you're also running it in?
What sort of torque are you expecting and what is it actually delivering?
I certainly get naff all out of my KR-1S engines that low down.
You say you're also running it in?
What sort of torque are you expecting and what is it actually delivering?
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- Premix Junkie
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The rare KR250S has a different top-end with an early 'KVSS' powervalve system. The ordinary KR250A doesn't. It was designed to fill in the gaps in the low/midrange curve, the standard KR is very flat at the bottom.500bernie wrote:What do you mean when you say "we don't have exhaust valves"?
Kawasaki KR250 Tandem Twin (x4) & KS-II 80,
Yamaha RD350LC,
Suzuki GSX-R750RK & RB50 Gag.
Yamaha RD350LC,
Suzuki GSX-R750RK & RB50 Gag.
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- Oil Injector
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- ScottaKR
- Premix Junkie
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- Location: Australia
Sounds like it definately has an issue then. From my experience, they are quite rideable all the way through the rev range. You certainly shouldn't have to slip the clutch just to get it past 3k. I'm wondering if the rotary reed valves are adjusted properly.
KR250 Tandem Twin (Naked)
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)
- ScottaKR
- Premix Junkie
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- Location: Australia
Yes, and no. They're not really adjustable as such, but they can be installed incorrectly putting their timing out. Was just a thought.2stroke wrote:Are they adjustable ?ScottaKR wrote:I'm wondering if the rotary reed valves are adjusted properly.
KR250 Tandem Twin (Naked)
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)
KR1 Red/White
KR1S Track Bike (has been put on hold for now)
ZXR750 H1 (Winter project)
- Top-shaggy
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You can adjust the timing by either moving the disk on the splines or / and of course cutting the disc (carefully as I believe they are NLA from KHI). I put a post on here somewhere showing how to derestrict the AR125 rotary disk valve... If you have a look at this it shows what I mean as the disks are virtually the same.ScottaKR wrote:Yes, and no. They're not really adjustable as such, but they can be installed incorrectly putting their timing out. Was just a thought.2stroke wrote:Are they adjustable ?ScottaKR wrote:I'm wondering if the rotary reed valves are adjusted properly.
If it takes more than 2strokes then your just playing at it..