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Enduro Suspension Tuning & maintenance of Enduro forks, shocks, etc


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  #31  
Old 11-15-2014, 11:40 AM
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[QUOTE=J I have a new chain on hand and was planning to move the rear wheel back some to add some leverage to the shock and see if it would track better on snotty uphills. [/QUOTE]

I changed my final gearing from 13/50 to 12/48 which moved my rear wheel back about half an inch and the difference on trashy hill climbs was noticeably better.


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  #32  
Old 11-15-2014, 09:33 PM
lonetree lonetree is offline
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i'll be watching this thread, as i still have those yzf triples and kyb hanging round.....
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  #33  
Old 11-15-2014, 10:07 PM
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Still waiting.

I think I know where I'm going to go with them. Need to decide if I'll press new bearings into the gasser hub, or have spacers made up similar to the rear which sit in the inner race.

Really looking forward to replacing the Marzocchis. In the mean time I think I'm going to swap back to the TTX setup.
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  #34  
Old 11-16-2014, 12:18 PM
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As the spacer is 2mm thick that is quite a workable size for a steel tube.you could make it just under 28 and a tight fit 20 and press it onto the axle against the closed end and make it stop 1/2 way into the far spacer so the floating fully works.

That is if the closed end is 28 or bigger which surely it is.

Bugger that would have been much easier- and reversable.
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  #35  
Old 11-21-2014, 11:36 PM
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Good idea F5. We'll bounce this idea more when I get to it.

Forks should be arriving next week some time.
I have an axle from an 04 WR250F at my disposal (including front wheel and spacer). I was thinking I may be able to transfer the whole lot across, but thinking things through I will meet issues as the WRs use a 25mm offset lug so the brake carrier will still be out.

Working off this, I've found a better list of various KYB SSS forks and their dimensions.

YZ250F (02-06) 35mm lug / 56mm upper clamp.
YZ250F (07-11) 32mm lug / 56mm upper clamp.
YZ250F (12+) 32mm lug / 54mm upper clamp (fits stock 48mm triples).

YZ450F (03-07) 35mm lug / 56mm upper clamp.
YZ450F (08-09) 32mm lug / 56mm upper clamp.
YZ450F (10+) 32mm lug / 54mm upper (fits stock 48mm triples).

YZ250 (01-07) 35mm lug / Believe all use 56mm upper clamp.
YZ250 (08+) 32mm lug / Believe all use 56mm upper clamp.

WR250F and WR450F (02-13) 35mm lug - unsure which years inc SSS vs OC. Believe all use the 56mm upper clamping diameter.

So from that list, depending on what you want to achieve and whats available will depend whats required.

I intend on using the Stock Gas Gas 22mm offset triple clamps with the 12 YZ250F forks. The reduction in overall offset will be -3mm. If using forks with the larger upper OD, using KYB 25mm triple clamps will retain the stock geometry/overall offset.

Also, as I plan on using the Gas Gas front wheel which has a 260mm disc vs the YZF 250mm I will require an oversize caliper carrier for the particular forks (lug offset) that I will be using. Braking POW106. I have ordered one of these.

For the forks with the 35mm lugs the correct carrier is POW13.

The ideal solution IMO would be to source a set with 35mm lug from a late model WRF and have the upper triple clamped machined - I'm taking a risk with the -3mm offset for the ease of fitment. If the reduced offset ends up being too much I will be somewhat limited in my options as these late model Yamahas they come off all use 20mm offset triple clamps. I could source some older triples and shim the upper clamp. In my research I have read that many people would however sub out the stock 25mm offfset clamps for 22/22.5mm on the YZ250's for better handling.. I have also found the head stem angle to be similar between the 2 bikes, and that most new bikes run a similar angle with less offset. Glenn found the increased trail to be too much on his Beta 2T, however they already come standard with a 20mm offset clamp. Both bikes use a 27 degree steering rake angle.
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  #36  
Old 11-22-2014, 03:57 AM
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I fitted some black polini fork guards for a YZ, but I didn't fit the std stickers that came with them. I took no measurements. Sorry.
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  #37  
Old 11-28-2014, 01:26 AM
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So the new forks arrived today, and while I have been waiting I moved the Ohlins TTX/Sachs legs over onto the 2013 model to keep getting punished. The 2010 is sitting with clear triples waiting for some fitment.

Few pics of the forks. They are as described 'NEW'. Can still feel the stiction in the seals. No markings or wear visible other than where the axle and caliper were clamped. Good find and looking forward to moving on with the project.







From the research I have done, stock valving will be way too firm. I'll follow that up in the next post.
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  #38  
Old 11-28-2014, 08:10 AM
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nice, what did those set you back?
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  #39  
Old 11-28-2014, 11:50 AM
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My first ride is tomorrow on stock springs and shims.
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  #40  
Old 11-28-2014, 12:32 PM
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Quote:
Originally Posted by Jakobi View Post
Good idea F5. We'll bounce this idea more when I get to it.

Forks should be arriving next week some time.
I have an axle from an 04 WR250F at my disposal (including front wheel and spacer). I was thinking I may be able to transfer the whole lot across, but thinking things through I will meet issues as the WRs use a 25mm offset lug so the brake carrier will still be out.

Working off this, I've found a better list of various KYB SSS forks and their dimensions.

YZ250F (02-06) 35mm lug / 56mm upper clamp.
YZ250F (07-11) 32mm lug / 56mm upper clamp.
YZ250F (12+) 32mm lug / 54mm upper clamp (fits stock 48mm triples).

YZ450F (03-07) 35mm lug / 56mm upper clamp.
YZ450F (08-09) 32mm lug / 56mm upper clamp.
YZ450F (10+) 32mm lug / 54mm upper (fits stock 48mm triples).

YZ250 (01-07) 35mm lug / Believe all use 56mm upper clamp.
YZ250 (08+) 32mm lug / Believe all use 56mm upper clamp.

WR250F and WR450F (02-13) 35mm lug - unsure which years inc SSS vs OC. Believe all use the 56mm upper clamping diameter.

So from that list, depending on what you want to achieve and whats available will depend whats required.

I intend on using the Stock Gas Gas 22mm offset triple clamps with the 12 YZ250F forks. The reduction in overall offset will be -3mm. If using forks with the larger upper OD, using KYB 25mm triple clamps will retain the stock geometry/overall offset.

Also, as I plan on using the Gas Gas front wheel which has a 260mm disc vs the YZF 250mm I will require an oversize caliper carrier for the particular forks (lug offset) that I will be using. Braking POW106. I have ordered one of these.

For the forks with the 35mm lugs the correct carrier is POW13.

The ideal solution IMO would be to source a set with 35mm lug from a late model WRF and have the upper triple clamped machined - I'm taking a risk with the -3mm offset for the ease of fitment. If the reduced offset ends up being too much I will be somewhat limited in my options as these late model Yamahas they come off all use 20mm offset triple clamps. I could source some older triples and shim the upper clamp. In my research I have read that many people would however sub out the stock 25mm offfset clamps for 22/22.5mm on the YZ250's for better handling.. I have also found the head stem angle to be similar between the 2 bikes, and that most new bikes run a similar angle with less offset. Glenn found the increased trail to be too much on his Beta 2T, however they already come standard with a 20mm offset clamp. Both bikes use a 27 degree steering rake angle.
I just finished machining a set of upper GasGas triples for SwaziMatt - there's enough meat there to do that.
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