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I'm gunna give it a go if it needs it.
Something slips but only when cold so I've been living with it.
Not sure if it's the torque limiter or sprague but I thought I'd pull it to bits and check it out on the weekend.
Coops
Something slips but only when cold so I've been living with it.
Not sure if it's the torque limiter or sprague but I thought I'd pull it to bits and check it out on the weekend.
Coops
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
what i'd like "us" to do is to measure the natural shape of the spring by fitting it over a huge socket etc and get the diameter?
then we need to find a similar strength spriung from something else in life that would fit straight on. it's alright the heath robinson types lashing and chopping but for the thing to be numpty proof we need to swop springs.i hope you all ahgree it's at least a good idea? and now start thinking. i think the spring in a fork seal is a decent start. then there must be something else out there.
the other idea i had was to find out if someone does a 'barb' that would hook inside going both ways to hold the spring.
just an idea.
i should mention that i'm about to fit a 'dutch clog' decomp on a bike which as you may all have read will make the compression very, very low and the bike easy to turn. it still has the leccy boot fitted and a slipping sprague. standard YTX5S battery and strater motor!
all i can say is:
EGOR VEE NEED MORE POWER!!!!!!!!!!!!!
(film buffs invited to guess as usual - one for json i reckon)
regards
Taffy
then we need to find a similar strength spriung from something else in life that would fit straight on. it's alright the heath robinson types lashing and chopping but for the thing to be numpty proof we need to swop springs.i hope you all ahgree it's at least a good idea? and now start thinking. i think the spring in a fork seal is a decent start. then there must be something else out there.
the other idea i had was to find out if someone does a 'barb' that would hook inside going both ways to hold the spring.
just an idea.
i should mention that i'm about to fit a 'dutch clog' decomp on a bike which as you may all have read will make the compression very, very low and the bike easy to turn. it still has the leccy boot fitted and a slipping sprague. standard YTX5S battery and strater motor!
all i can say is:
EGOR VEE NEED MORE POWER!!!!!!!!!!!!!
(film buffs invited to guess as usual - one for json i reckon)
regards
Taffy
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
Hannu
but surely to shorten a fork spring you may as well have shortened the sprague spring or am i missing something here?
sorry to be pedantic but was that a fork spring from some 48mm forks?
oh dear we are going off up a cul-de-sac here!!!!!
let's hope it leads somewhere? thanks for checking.
regards
Taffy
but surely to shorten a fork spring you may as well have shortened the sprague spring or am i missing something here?
sorry to be pedantic but was that a fork spring from some 48mm forks?
oh dear we are going off up a cul-de-sac here!!!!!
let's hope it leads somewhere? thanks for checking.
regards
Taffy
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
i took a spring off one tonight and fitted it perfectly around the outside of a 47mm bearing. i estimate that the spring has an ID of 46.5mm.
if the spring fits inside the lip of a seal and we want one shorter i guess that pyeD etc shoulkd bring us around to a seal that's 42mm ID and a 44mm ID spring or so? thats a big ol seal!
i don't believe that fork seals have a spring in them? right?
regards
Taffy
if the spring fits inside the lip of a seal and we want one shorter i guess that pyeD etc shoulkd bring us around to a seal that's 42mm ID and a 44mm ID spring or so? thats a big ol seal!
i don't believe that fork seals have a spring in them? right?
regards
Taffy
Taffy,
I shortened both, fork seal spring came from a KTM repair shop dust bin and the sprague spring was the original one. I use the shortened fork seal spring with no problems. I'm afraid I didn't measure the spring, just fitted it in the sprague, tested it - no good - opened the sprague, shortened the spring approx. 5 mm. The original stretched a bit and I found the fork seal spring (dust lip). I just checked my HB front fork rubber dust lip (fork seal?) and it has a separate spring. Sorry for the confusion and not being accurate in my expression.
I will punish myself severely. ; )
-Hannu
I shortened both, fork seal spring came from a KTM repair shop dust bin and the sprague spring was the original one. I use the shortened fork seal spring with no problems. I'm afraid I didn't measure the spring, just fitted it in the sprague, tested it - no good - opened the sprague, shortened the spring approx. 5 mm. The original stretched a bit and I found the fork seal spring (dust lip). I just checked my HB front fork rubber dust lip (fork seal?) and it has a separate spring. Sorry for the confusion and not being accurate in my expression.
I will punish myself severely. ; )
-Hannu
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
well i'm glad it worked for you hannu. well done!
but we're in the dark i believe as to what you got the spring off and how short you made it.
this is the story of my phuqing life ol mate!
i've just jumped off a stool but the rope broke!
regards
Taffy
but we're in the dark i believe as to what you got the spring off and how short you made it.
this is the story of my phuqing life ol mate!
i've just jumped off a stool but the rope broke!
regards
Taffy
Taffy,
it seems that my previous posting was a bit cryptic. it was not intentional.
i shortened the KTM front fork dust lip spring approx. 5 mm. it felt a bit tjghter than the original unshortened spring. i think a magniffying glass helps a lot when checking where to cut the spring. i cut the spring first and the took off the excess and joined the two ends.
Hannu
it seems that my previous posting was a bit cryptic. it was not intentional.
i shortened the KTM front fork dust lip spring approx. 5 mm. it felt a bit tjghter than the original unshortened spring. i think a magniffying glass helps a lot when checking where to cut the spring. i cut the spring first and the took off the excess and joined the two ends.
Hannu
Taffy,
just checked the shop, the spring was from a 48 mm fork.
The original shortened spring measures opened 137,2mm.
137,2/(2x3,14)x2=43,7. A spring from a 43 mm fork should fit ok.
The spring should feel tighter than the original spring.
Hannu
just checked the shop, the spring was from a 48 mm fork.
The original shortened spring measures opened 137,2mm.
137,2/(2x3,14)x2=43,7. A spring from a 43 mm fork should fit ok.
The spring should feel tighter than the original spring.
Hannu
is the fork seal(dust seal??????) spring stronger????
in an earlier post it was said to be too soft?? can i just shorten the standard spring on will it just streatch.
ps. i ordered the later model decomp and spring today, should be in by fri this week. cost about AUS$65.
in an earlier post it was said to be too soft?? can i just shorten the standard spring on will it just streatch.
ps. i ordered the later model decomp and spring today, should be in by fri this week. cost about AUS$65.
The 48 mm fork dust lip spring is just a bit too long, it needs to be shortened. The original is perfectly OK when shortened. I haven't tried the 43 mm fork DL spring, that should also do the job. When you disassemble the sprague, check the tightness of the spring and compare it to your modified one. The new one should fit tighter. If you can, find the joint in the spring and open it by unwinding both ends. Then measure the old original one and make the new one shorter. Please let us know the measure. The outer diameter (fat end)of the spring is 1,5mm and inner(thin end) 1mm.
-hannu
-hannu
I measured the original when apart as I didn't have anything to put it around.
It measured 153/154 mm including the tapered joining section.
The rollers on mine did show some wear so I'm not sure if I'm gunna use it yet or just get a new item as the cost isn't as bad as I expected - about $120 AUD.
But just in case I can't get one or they tell me it was $120 for each roller or something I have re-assembled the old 1.
I decided to cut 10% or about 16mm off the total length of the original spring as a starter.
Since about 4/5mm of this is the tapered joining section it means I cut about 11/12mm from the overall joined up spring circumference.
It feels good, went back together quite easy and IMHO isn't too tight.
If you do the sums the diameter of mine ends up around 43/44mm which is close to what you guys are talking about.
More good luck than good management though.
It measured 153/154 mm including the tapered joining section.
The rollers on mine did show some wear so I'm not sure if I'm gunna use it yet or just get a new item as the cost isn't as bad as I expected - about $120 AUD.
But just in case I can't get one or they tell me it was $120 for each roller or something I have re-assembled the old 1.
I decided to cut 10% or about 16mm off the total length of the original spring as a starter.
Since about 4/5mm of this is the tapered joining section it means I cut about 11/12mm from the overall joined up spring circumference.
It feels good, went back together quite easy and IMHO isn't too tight.
If you do the sums the diameter of mine ends up around 43/44mm which is close to what you guys are talking about.
More good luck than good management though.
Yeah Hannu you're prolly right but the rollers show some light wear marks (flat spots) so I've decided to buy a new 1 and I'm gunna use a tighter spring also.
I was gunna put my old cut down spring on the new sprague but, in the name of research, I'm gunna bust up a brand spanking new sprague and do some measurements.
The new spring OD was 48mm. Apart it measured 151mm which was a couple of mm shorter than my old 1 so they either stretch slightly with use over time or they now come a little tighter.
I'm trying hard to hold back on the jokes about young, tight and stretching with age but what can you do?
I cut 11mm off it and re-joined. The OD is now about 44mm.
I'll put it back together and let you know.
I was gunna put my old cut down spring on the new sprague but, in the name of research, I'm gunna bust up a brand spanking new sprague and do some measurements.
The new spring OD was 48mm. Apart it measured 151mm which was a couple of mm shorter than my old 1 so they either stretch slightly with use over time or they now come a little tighter.
I'm trying hard to hold back on the jokes about young, tight and stretching with age but what can you do?
I cut 11mm off it and re-joined. The OD is now about 44mm.
I'll put it back together and let you know.
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