Author Topic: 5.5 - 6.5 Rear Spring for 84 Honda CR250  (Read 5316 times)

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Offline Kenneth S (222)

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5.5 - 6.5 Rear Spring for 84 Honda CR250
« on: February 24, 2014, 06:39:14 AM »
Dimensions,

Exact Stock Length is 275mm but anything from 260 - 275mm will work.

ID 56mm

OD 78mm

Contact Kenneth 0411 639 649
« Last Edit: February 24, 2014, 06:05:25 PM by KJS222 »
Kenneth S
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Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #1 on: February 24, 2014, 06:04:56 PM »
Ken , can you be a bit more specific . In 240, 250 and 260 mm length  ID 59-60 I have many options .

Hi Lozza, I've updated the specs above.
Kenneth S
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76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline JohnnyO

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #2 on: February 24, 2014, 07:16:07 PM »
I think Walter is asking what spring rate you want, I don't think there's such a rate as 5.5-6.5 and there are about 10 available between 5.5 and 6.5 

Offline Ted

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #3 on: February 24, 2014, 07:30:17 PM »
Teknik have 28 springs in stock to suit in 5.6

He needs to know if it is 56mm ID both ends.

If you can supply both end ID he will supply collars and spring for $150 and I will bring to Cessnock on Friday.
81 YZ 465 H   77 RM 125 B

Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #4 on: February 24, 2014, 08:10:53 PM »
Thanks Guys, Ideally I'm looking for a cheap 2nd hand one sitting on someones shelf to try out. I am not sure what rate suits me.

At the moment the bike has a 4.1 in it which is too soft. When I go on the Racetech website and use their spring rate calculator for this model it tells me at 88Kg, I need a 7.2. That seems very high to me so I am willing to try something between 5.5 - 6.5 as a starting point to see how it feels. It may well work out that the bike will still feel too soft and I do need 7.2 but a spring at a rate between 5.5 - 6.5 will at least be a vast improvement over what I have now.
« Last Edit: February 24, 2014, 08:17:10 PM by KJS222 »
Kenneth S
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Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

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76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline Paul552

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #5 on: February 24, 2014, 08:16:17 PM »
Ken

Off the top of my head I don't know what is in mine but I'm happy for you to try mine out if it helps you?
I won't be at  cessnock but will be at the vinduro ?
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #6 on: February 24, 2014, 08:27:53 PM »
Ken

Off the top of my head I don't know what is in mine but I'm happy for you to try mine out if it helps you?
I won't be at  cessnock but will be at the vinduro ?

Cheers Paul. Very kind of you, I'll see how I go, I hope to have it sorted this week
Kenneth S
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Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline Ted

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #7 on: February 24, 2014, 08:33:15 PM »
Ask yourself this Ken " why does he have 28 springs in 5.6"

Standard is 4.5
81 YZ 465 H   77 RM 125 B

Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #8 on: February 24, 2014, 08:48:56 PM »
Ask yourself this Ken " why does he have 28 springs in 5.6"

Standard is 4.5

Different bikes have different leverage ratios Ted. Anyway, I just need to feel what something in the 5.5 to 6.5 range is like to make my own assessment. There seems to be so much conflicting information out there.
« Last Edit: February 24, 2014, 08:51:07 PM by KJS222 »
Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline JohnnyO

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #9 on: February 24, 2014, 09:26:12 PM »
I've fitted 5.6 shock springs to several 84 CR500 's, that rate seems to be on the money for most.

Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #10 on: February 24, 2014, 09:55:46 PM »
I've fitted 5.6 shock springs to several 84 CR500 's, that rate seems to be on the money for most.

Great thanks. That helps
Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline Paul552

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #11 on: February 27, 2014, 09:12:33 PM »
I've fitted 5.6 shock springs to several 84 CR500 's, that rate seems to be on the money for most.

Great thanks. That helps

Hey ken I am interested how you went with this?
Was the bike better?
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

Offline Kenneth S (222)

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #12 on: February 28, 2014, 04:39:23 AM »
I've fitted 5.6 shock springs to several 84 CR500 's, that rate seems to be on the money for most.

Great thanks. That helps

Hey ken I am interested how you went with this?
Was the bike better?

I'll find out tomorrow Paul. It feels better in the workshop. I'll let you know.
Kenneth S
Go For It

Heaven VMX Club - Racing No 222 - 79 CR250RZ - 84 CR250RE (Steam Train) - 89 CR250RK

Race Bike History
76 RM125A, 77 RM125B, 78 RM125C, RM400C, 79 CR250RZ, 80 YZ250G, 81 RM465X, 82-83 RM490 Frank Pons Special(Beetle's 81 Race Bike)

Offline Nathan S

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #13 on: February 28, 2014, 09:04:43 AM »
Anything in the 5.x range will be too soft. I doubt that 6.5 will be enough.

I've got the RaceTech recommended 7.2 or 7.4 in mine, and it feels spot on (based on the sags and the little riding I've done on the bloody thing).

Don't be worried by the big jump in rate - they ran silly rates in them back in the day. The stock forks springs a .29 or something similarly insane - when you'd be wanting something up around 0.45s.
The shock linkage ratio is whacky by modern standards too. 
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Offline FourstrokeForever

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Re: 5.5 - 6.5 Rear Spring for 84 Honda CR250
« Reply #14 on: February 28, 2014, 10:14:09 AM »
I had .48 forks springs and 7.2 rear spring on my '86 CR250 and it worked great. At the end of the day, it all comes down to your weight and riding style so spring rates is as personal as handle bar position.
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