Author Topic: Progressive fork springs - Spacers? (Read 2872 times)

Patrick · « **on:** April 14, 2008, 08:58:09 AM »

I put new progressive fork springs in my K5 750. They were the right springs for the bike. I did not use any spacers with the springs. I still get some nose dive when I brake. Do y'all use any spacers? if so, how long? Should there always be some give on the front end when you stop or should I aim for more stability?

The bike rides fine - nice and steady.

Patrick

mlinder · « **Reply #1 on:** April 14, 2008, 09:17:45 AM »

That's the natural order of things. You brake, weight moves forward, forks compress.
Progressive springs compress at a different rate the more they are compressed. you'll notice the most difference while riding in twisties.

andy750 · « **Reply #2 on:** April 14, 2008, 09:39:20 AM »

Patrick,

I used PVC inserts with my progressive springs - no complaints and no diving...nice and firm

(CB750K4)

cheers
Andy

Patrick · « **Reply #3 on:** April 14, 2008, 10:47:31 AM »

How long are the inserts you used, Andy?

Ricky_Racer · « **Reply #4 on:** April 14, 2008, 10:50:04 AM »

How long are your PVC spacers, Andy? What do you weigh, and what weight fork oil are you running? And did you check and adjust your front end sag? Sorry for all the questions. Thanks. RR

Ricky_Racer · « **Reply #5 on:** April 14, 2008, 10:51:03 AM »

Oops. Sorry Patrick!

RR

andy750 · « **Reply #6 on:** April 14, 2008, 11:27:37 AM »

Quote from: Ricky_Racer on April 14, 2008, 10:50:04 AM

How long are your PVC spacers, Andy? What do you weigh, and what weight fork oil are you running? And did you check and adjust your front end sag? Sorry for all the questions. Thanks. RR

About 1/2 inch thick for spacers. I weigh 195lbs (6`4 tall) using medium weight fork oil (Ill need to check on the brand when I get home but its fork oil. Didnt check front end sag. I basically got progressive springs, inserted spacers, new fork oil and used this set up for a long distance trip (Mexico trip) over all kinds of terrain and mountain roads. Reason I did this is I knew there were a lot of uneven roads in Mexico and lots of speedbumps and figured this would be best for that kind of riding. It worked for me for this trip and also for a subsequent Alps trip. Ive since replaced fork oil and spacers but planning on re-installing in the coming weeks.

hope this helps,
cheers
Andy

scondon · « **Reply #7 on:** April 14, 2008, 02:09:27 PM »

I have 1/2" spacers just like Andy. I didn't like the thought of PVC pipe crumbling inside my forks so I tossed the spacers that came with the springs and used two large metal nuts and washers of equal size in each fork.

Ricky_Racer · « **Reply #8 on:** April 14, 2008, 04:34:44 PM »

Thanks, Guys! Only 1/2 inch spacers! That surprises me; I though they'd be much longer. I agree, Scondon. I'm not a big fan of PVC spacers when it's so easy to cut some tube. RR

andy750 · « **Reply #9 on:** April 15, 2008, 04:32:50 AM »

Quote from: Ricky_Racer on April 14, 2008, 04:34:44 PM

Thanks, Guys! Only 1/2 inch spacers! That surprises me; I though they'd be much longer. I agree, Scondon. I'm not a big fan of PVC spacers when it's so easy to cut some tube. RR

Ricky its hard enough to get the 1/2 spacers in and the fork nut back on so not sure you could get much longer. Anyway as a test piece the PVC insert I used was unscathed after 30,000 miles with no bits falling off

.

cheers
Andy

Ricky_Racer · « **Reply #10 on:** April 16, 2008, 12:08:09 AM »

Thanks, Patrick. Good input. BTW, has anyone made adjustable preload fork caps for the CB750's? I know Yamaha used them on the top of some XS-650 forks... Might be a cool and doable addition to our SOHC's. RR

voxonda · « **Reply #11 on:** April 16, 2008, 01:11:25 AM »

Quote from: Ricky_Racer on April 16, 2008, 12:08:09 AM

Thanks, Patrick. Good input. BTW, has anyone made adjustable preload fork caps for the CB750's? I know Yamaha used them on the top of some XS-650 forks... Might be a cool and doable addition to our SOHC's. RR

I have, but that was before my digital era, so no pic's. Have not been able to reproduce them but will in the near future.

Rob.

ttr400 · « **Reply #12 on:** April 16, 2008, 01:20:02 AM »

In Manufacture as we speak, for the 550 and 750 replaces part #90123-300-000.

Kevin

bwaller · « **Reply #13 on:** April 16, 2008, 03:34:53 AM »

Ata boy Kevin, keep the goodies coming!

andy750 · « **Reply #14 on:** April 16, 2008, 04:30:49 AM »

Quote from: ttr400 on April 16, 2008, 01:20:02 AM

In Manufacture as we speak, for the 550 and 750 replaces part #90123-300-000.

Kevin

Kevin can you let us know when these are available. Ill be looking for a set for the 750.

cheers
Andy

Ricky_Racer · « **Reply #15 on:** April 16, 2008, 06:21:10 AM »

Right on, Kevin! Glad I asked. Please let us know when they're available. How about a "deal" for the ol' SOHC'ers?

RR

Patrick · « **Reply #16 on:** April 16, 2008, 07:12:27 AM »

Adjustable load fork caps? That would be my answer...

Thanks for the input, guys. I'll try 1/2 spacers, Andy. I don't want my bike to ride like a truck, but I expected a bit more firmness when I bought the springs.

Patrick

ttr400 · « **Reply #17 on:** April 16, 2008, 11:07:06 PM »

I plan to have them finished around the end of the month. I will have 50 sets for this first run.
Ricky, I'm sure I can do a deal for the forum members if they want a set.
What I normally do on the finish is anodise all the main caps bright silver and them have an option for the center adjuster colour. choose from Silver,Black,Gold,Red,Blue
Or the complete cap and adjuster in a polished finish.

Kevin

troppo · « **Reply #18 on:** April 17, 2008, 01:44:33 AM »

Going to have to keep my eyes open for when you have them available kevin.
What sort of price range are we looking at for a set?
Cheers mate
Troppo

CrisPDuk · « **Reply #19 on:** April 17, 2008, 03:06:13 AM »

Quote from: ttr400 on April 16, 2008, 01:20:02 AM

In Manufacture as we speak, for the 550 and 750 replaces part #90123-300-000.

Kevin

Digging that website TTR

Are your parts available to buy in the UK at all?

ttr400 · « **Reply #20 on:** April 17, 2008, 05:44:10 AM »

My CB400F ones retail for US$75.00 per pair. but for a limited time I will give forum members a good discount on the 550/750 sets.

In the UK my parts can be ordered from SteveD's website. I think it's Nirvana...
Disco Valante has a limited range. also some CB72/77 Tappet covers.
In the states Kevin at the 400fourstore.com

Or from myself in sunny SA.

Kevin

mafd2 · « **Reply #21 on:** June 30, 2008, 10:31:54 AM »

Can anyone tell me the length of the stock springs that were removed from their forks? I think the springs in my K1 have been changed to lower the bike as the front end is lower than stock. I want to get Progressive springs for mine too. What is the outside diameter of the 1/2" spacers you all are using? Thanks in advance guys.

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Author Topic: Progressive fork springs - Spacers? (Read 2872 times)

troppo