Front forks
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Front forks
Hi all, hope everyone had a great Christmas. Now I’ve fitted the air ride system to m6 trike and fitted Brembo 4 piston callipers I get a knock when hard breaking. I’m guessing it’s the front forks bottoming out. When I jack the front up I’m supprised how much of the fork tube comes out the sliders. Any one ever beefed up the front forks. I have the 2” conventional forks not the 64mm inverted. I’ve changed the fork oil. I can live with it just wondered if there was was a spring upgrade. Thanks
- Grand Canard
- Posts: 371
- Joined: Fri Apr 02, 2010 2:02 am
- Location: Lake Arthur, Louisiana
Re: Front forks
The later model front suspension (at least from 2007)spring tension is adjustable; if you have that, it should solve your problem.
Look on top of your triple tree, above each fork tube for a machined hole (might have a removable cap covering hole) that will have an allen screw inside. Turn it clock-wise with an allen key to increase tension on fork springs.
Rick
Look on top of your triple tree, above each fork tube for a machined hole (might have a removable cap covering hole) that will have an allen screw inside. Turn it clock-wise with an allen key to increase tension on fork springs.
Rick
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- Orlando606VetteTrike
- Posts: 310
- Joined: Sun Oct 25, 2015 1:24 pm
- Location: Winter Garden, FL
Re: Front forks
On my previous 2000 Big Block which had the conventional front end, I added a longer preload rod which gave me more spring preload which corrected my fender hitting the fan issue. When you unscrew the allen cap which has long threads, there is a steel rod that the threaded allen screw/cap pushes down on creating more spring preload. Pull out the that rod, and cut one longer, drop it in, and reinstall the cap. You'll see it takes a little more strength when pushing that cap back in to start the threads. At the time i did this, there was no spring upgrades that i knew of, hence the choice to length that preload rod.
2008 606 Corvette Trike
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Re: Front forks
Thanks Orlando. That I think that’s the way ahead. I believe the early forks were bespoke so finding stiffer springs like progressive would be difficult. Do you remember how much longer you made them ?. I’ll have a look at the weekend. Thanks again.
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Re: Front forks
Thanks Rick, unfortunately I have the old forks. No preload adjustments.Grand Canard wrote:The later model front suspension (at least from 2007)spring tension is adjustable; if you have that, it should solve your problem.
Look on top of your triple tree, above each fork tube for a machined hole (might have a removable cap covering hole) that will have an allen screw inside. Turn it clock-wise with an allen key to increase tension on fork springs.
Rick
- 502wingman
- Posts: 413
- Joined: Thu Nov 22, 2007 9:59 am
- Location: Backnang, Germany
Re: Front forks
You may try to "overfill" the forks by 100ml and use a heavier forkoil. Worked pretty good on my own and other bikes.
Peter the WingMan
Backnang, Germany
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- Orlando606VetteTrike
- Posts: 310
- Joined: Sun Oct 25, 2015 1:24 pm
- Location: Winter Garden, FL
Re: Front forks
No unfortunately i don't remember the total length. I might have added about 1/2 in.
Good luck.
Good luck.
2008 606 Corvette Trike
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Re: Front forks
Just for an update I lifted the front and measured the fork fully extended then dropped the weight back down. I went for a quick ride with Zip ties around the forks. The results are. There is 3” of sag stationary and I have 1” of dive with heavy breaking. No wonder I’m bottoming out !!! Bit of experimenting I think. Thanks to all.
Re: Front forks
Seems like to me you should be riding at about half
or less of the full travel. If it's dropping 3 of the 4 inches
of travel you have maybe you should add a spacer
over the spring to bring it back to the middle of travel
or a little above the middle. In the old HD glides
a 350 Honda fork tube was just right.
Paul H
or less of the full travel. If it's dropping 3 of the 4 inches
of travel you have maybe you should add a spacer
over the spring to bring it back to the middle of travel
or a little above the middle. In the old HD glides
a 350 Honda fork tube was just right.
Paul H
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Re: Front forks
Thanks Paul. That’s pretty much what I thought and what others have said. So today I went about it. I cut two .6 spacers from some 1.5” tubing I had. I did the R leg and reassembled. When I did the left leg the spring had a plug cap on it. I assumed they would be the same. I left it where it was and added the spacer. I will also add more oil. It’s done the job . Brought the front up another 1.5”. Any ideas thoughts or opinions on the cap appreciated.Paul H wrote:Seems like to me you should be riding at about half
or less of the full travel. If it's dropping 3 of the 4 inches
of travel you have maybe you should add a spacer
over the spring to bring it back to the middle of travel
or a little above the middle. In the old HD glides
a 350 Honda fork tube was just right.
Paul H
- knockdolian
- Posts: 628
- Joined: Wed Nov 18, 2015 3:44 pm
- Location: Yeovil Somerset UK
Re: Front forks
No reply’s to my question about the spring cap so I’m going to assume there should be one both sides so I’m going to get a pair made with the added 1/2 “ unless someone has one available ??