October 15th, 2021, 03:43 PM | #1 |
ninjette.org newbie
Name: Simon
Location: Riverstone
Join Date: Nov 2020 Motorcycle(s): Ex250 Posts: 5
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Pre gen to new gen forks and swing arm swap floating feeling problem
Ok so I own a Kawasaki gpx 250r II 1988 and I have swapped the front triple tree down including the wheel and brakes and rear swingarm back including wheel, brake and suspension components, of a ninja 250 2009 and I took it out for its maiden voyage and the bike seems to feel like it's not settled on the road kinda floaty feeling, Kinda like a flat tyre and the front end was really easy to turn witch made it turn by itself when leaning.
I thought the triple tree castle nut thing wasn't tight enough so I tightened it but it cant torque it since I don't have the so would love to know if that is important but even tighter it still felt wrong. I checked all the bolts torques and made sure the tire pressure was good and nothing moves when I shake it while it's in the air so I'm stumped at what it could be. The rear tyre is flat-spotted but I can't imagine it would be the problem. I would love anyone ideas on what could be the problem or if I was meant to add a washer somewhere or something while doing this swap, any info or ideas would be greatly appreciated. |
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October 15th, 2021, 03:58 PM | #2 | |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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Or do you mean it was like a chopper with an extended front end, that when you lean into a turn it tries to turn the handlebar farther and you have to countersteer to keep it on the line you want? Welcome to the board, Simon! |
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October 15th, 2021, 04:03 PM | #3 | |
ninjette.org newbie
Name: Simon
Location: Riverstone
Join Date: Nov 2020 Motorcycle(s): Ex250 Posts: 5
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October 15th, 2021, 04:38 PM | #4 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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That's often because of the fork tubes being too long. I don't know what bars you're using... can you try lowring the triple clamps on the fork tubes (extending the tubes up through the clamps) a little at a time?
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October 15th, 2021, 11:24 PM | #5 |
ninjette.org newbie
Name: Simon
Location: Riverstone
Join Date: Nov 2020 Motorcycle(s): Ex250 Posts: 5
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okay, I will try, I was running the same bars on the pre-gen forks and it didn't do it, so thought it was really weird. thank you though
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October 16th, 2021, 01:33 AM | #6 |
ninjette.org newbie
Name: Simon
Location: Riverstone
Join Date: Nov 2020 Motorcycle(s): Ex250 Posts: 5
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okay, I have seemed to have fixed it, it looks like I tightened the triple tree castle nut way too tight and lowering the suspension also helped with the leaning auto steer problem.
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October 16th, 2021, 05:27 AM | #7 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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Are you saying that the steering bearings were overtightened so they were not turning freely?
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October 16th, 2021, 12:42 PM | #8 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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yup, bearing preload too tight would interfere with trail's self-straightening action. It would require more off-centre aim to generate enough corrective force to move steering. Then it would overshoot centre until enough force was generated to swing back. Thus that wandering feeling. With smooth bearings, self-centering occurs much easier and bike tracks straight.
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October 17th, 2021, 02:31 PM | #9 |
ninjette.org newbie
Name: Simon
Location: Riverstone
Join Date: Nov 2020 Motorcycle(s): Ex250 Posts: 5
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yea, I was stupid I didn't realise they barely needed tightening, I'm probably gonna get a socket or something to make sure it's at the required torque but it seems good, the only thing I've noticed so far now is how hard the suspension is it's extremely aggressive. I don't know if it's normal but now it's way harder than my 2016 CBR 500
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October 17th, 2021, 02:52 PM | #10 | |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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October 17th, 2021, 03:05 PM | #11 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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