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Progressive fork springs with what oil?

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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 06, 2018 4:26 am

lol, i love how they build vehicles and constantly have clean hands :bg: you've probably heard of roadkill, if not, check it out on youtube =)

hopefully i'll be able to do some work this weekend =)

p.s. all the parts have arrived today. now i just need time to actually do the work:-(
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Mon Mar 12, 2018 10:23 pm

can someone confirm that the front fork takes 278cm^3 of oil?
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 13, 2018 1:00 am

278cc is the the 750

You make the call..heh :r:

Haynes: 2006
920J..........303cc
920MK / k...290cc <------This was kinda the odd listing in Haynes. 6 of one/ 1/2dozen of the other.
920RH / RJ..264cc

Clymer: 1987
920RH / RK.....264cc
920J / k / MK..303cc

I always put my money on Clymers. (specially early publishings) I find more mistakes in updated versions.
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 13, 2018 1:49 am

i really hate when they do that :sbox:

i just checked my 360 page Hayne for the hell of it. it also says 264cc. so im sticking with that. :thanks:
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 13, 2018 2:31 am

Ditto on the Hate.

Did you also notice "Capacity vs. Levels"? duh!

Probly the original author(s), died..new one just have to make it different. :;:

Why I usually go with "hand-on" experience. And..keep my nose outta books. Keeps ya from sounding like some poindexter. :der:
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Re: Progressive fork springs with what oil?

PostAuthor: faffi » Tue Mar 13, 2018 2:37 am

I always measure the level rather than rely on volume. Volume can be used as a guide to where you want your level, but I usually up the level a bit to get more resistance to bottoming.
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 13, 2018 3:08 am

how do you guys measure the level on these?
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 13, 2018 4:51 am

Most parts places have these dedicated fork oil gadgets--> https://www.denniskirk.com/284159.sku?u ... 5713335837

Me..I actually use a rotisserie spit from an old BBq I trashed. Cut it down to a decent length and carved in some groves for graduation marks. Worked out great.
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 13, 2018 4:53 am

I think im gonna get the $20 tool, but what do u set it at?
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 13, 2018 5:03 am

Crazy_Russian wrote:but what do u set it at?


There's really no pre-setting. That tool is just set at that particular level "After" pouring in whatever volume of oil you initially choose. More for balancing between the two tubes. The volume of oil determines where you'll put the measuring stick thru the disk and locking in place. And..adding or subtracting at your pleasure. I've use them couple times in the shop, but totally unnecessary, I always thought. Coarse if you change your fork oil few times a year or do alotta front ends. Really, the only time "I" ever found those fancy oil leveling gizmos handy was on the track. Where the rider might not like something going on at the front end and wanted to do a quick check (maybe adjust level). Just totally my take.
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Re: Progressive fork springs with what oil?

PostAuthor: faffi » Tue Mar 13, 2018 6:33 am

Try 150 mm as a starting point. Use a zip tie around a stanchion and fully compress the fork - you need to slowly pump the forks anyway to get the air out before measuring the level - and measure the distance from the lower for leg to the zip tie. Or the bottom of the triple tree - somewhere fixed that you can use as a reference. To find if the level is correct, find a bumpy bit of tarmac and to a maximum braking test. Use care and work up to this so you do not just lock up the wheel and go down. You want between a 1/4 and 1/2 inch of travel left after the test. If the fork bottoms out, you need a bit more oil - try adding 10 mm - and if it is far from its stop you either have too stiff springs or too much oil. Or both. Or you're not braking hard enough :bg:
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 13, 2018 5:16 pm

i will try the zip tie method when weather permits (we got another storm coming) but starting out with the 264cc to get a base reading. i assume 150mm is measured from the top with fork compressed? and the tool is on it's way as it was under $20
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 13, 2018 8:51 pm

slightly off subject, is this the right tool for the steering head? https://www.ebay.com/itm/Yamaha-Steerin ... y-&vxp=mtr
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Re: Progressive fork springs with what oil?

PostAuthor: faffi » Wed Mar 14, 2018 2:53 am

Yes, you measure the level from the top with forks fully compressed, springs out.
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Sun Mar 18, 2018 6:34 pm

got the forks to 150mm. which is about 5mm off from the 264cc's :)

now a dumb questin, on progressive spring, the tightly wound coil goes towards the bottom or the top? having a brain glitch :;:
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Sun Mar 18, 2018 7:48 pm

just got an answer, toward the bottom
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Mon Mar 19, 2018 1:20 am

Yep Yep..that's why they're called Progressive. Cuz of the windings They just "up" the compression "sooner" than non-progressive springs. Front or rear. Just normal spring action until it starts to compress. Then the tighter windings come into play. Kinda a cleaver company name when you think about it.
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 20, 2018 2:07 pm

Well? How many times did the fork caps go flying across the room, before ya got the threads started? :bg:
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Re: Progressive fork springs with what oil?

PostAuthor: Crazy_Russian » Tue Mar 20, 2018 2:22 pm

Flyingdog wrote:Well? How many times did the fork caps go flying across the room, before ya got the threads started? :bg:

First one, only once, the 2nd one...i dont want to talk about it
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Re: Progressive fork springs with what oil?

PostAuthor: Flyingdog » Tue Mar 20, 2018 2:43 pm

:rotfl:
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