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Author Topic: Rm125b forks  (Read 4686 times)

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Offline craigclayton

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Rm125b forks
« on: May 22, 2019, 10:33:35 pm »
What is the best way to improve my rn 125b forks. They are completely standard but cleaned and fresh oil.
Ps I’m 82 kg ‘s
Cheers C
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74 Bultaco 250, 77 RM125b

Offline Iain Cameron

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Re: Rm125b forks
« Reply #1 on: May 22, 2019, 11:04:59 pm »
Oh no here comes 30 pages plus .  sorry Craig couldn't resist it .
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline John Orchard

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Re: Rm125b forks
« Reply #2 on: May 23, 2019, 09:19:41 am »
On my 125B l just put in heavier compression springs to match my weight and found a shorter top-out spring, long top-out springs are needed to make intial travel more supple on air pressured forks. After that l was totally happy with them.
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Johnny O - Tahition_Red factory rider.

Offline Ted

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Re: Rm125b forks
« Reply #3 on: May 23, 2019, 11:36:16 am »
Quote from: craigclayton on May 22, 2019, 10:33:35 pm
What is the best way to improve my rn 125b forks. They are completely standard but cleaned and fresh oil.
Ps I’m 82 kg ‘s
Cheers C

V4S travel control valves, correct springs for the application and somebody competent with a suspension dyno prepared to dial them in correctly. Also NO air pressure
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81 YZ 465 H   77 RM 125 B

Offline craigclayton

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Re: Rm125b forks
« Reply #4 on: May 23, 2019, 12:44:02 pm »
Where did you get the heavier springs from John
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74 Bultaco 250, 77 RM125b

Offline John Orchard

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Re: Rm125b forks
« Reply #5 on: May 23, 2019, 07:52:30 pm »
Quote from: craigclayton on May 23, 2019, 12:44:02 pm
Where did you get the heavier springs from John


Racetech - Syd, YSS - Adelaide, l imagine any suspension could supply?
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Johnny O - Tahition_Red factory rider.

Offline LWC82PE

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Re: Rm125b forks
« Reply #6 on: May 23, 2019, 08:27:12 pm »
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Offline craigclayton

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Re: Rm125b forks
« Reply #7 on: May 24, 2019, 12:16:56 pm »
Thank you all, have downloaded manual and will search for heavier springs.
Cheers C
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74 Bultaco 250, 77 RM125b
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