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Yamaha YZ450F (2016)


Owner: Goof331
Added on Yesterday, 06:31 AM
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Race Tech Springs Vs. Factory Connection / MX Tech... ect


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14 replies to this topic
  • NorCal

    TT Addict

3,439 posts
Location: California

Posted August 26, 2016 - 01:20 PM


My new Race Tech springs came in the other day. While swapping

the shock spring, I noticed the shock spring was quite a bit shorter

than the stock spring.... spoke to a buddy and said that's normal. Oh

well, okay...

Today I was installing the Race Tech front fork springs and again, they

are noticeably shorter than the stockers. I called the Race Tech guy

and said I need to user the 2 provided washers as spacers. WTF?

First of all, the washers have to go behind the plastic cone thing, and

I can't pop the C -clip off without feeling like something is going to snap

or gouge. Secondly, do I really want to be using washers in the fork?

Shouldn't the spring be the same height as the stock spring?

 

I'm thinking about returning this and going with another brand. Does

anyone have any experience with Factory Connection, MX Tech, etc..?

 

Any help is appreciated. 

Nick



  • Krannie McKranface
36,164 posts
Location: California
Garage View Garage

Posted August 26, 2016 - 03:15 PM


Standard operating procedure is if the spring you are getting is 'stiffer', it will most likely be shorter too, if from RaceTech.

 

Sometimes the same, sometimes different from other companies.

 

If you look on RaceTechs site, it lists the spring dimensions for every weight spring, so they are telling you in advance.

 

Same for most others.

 

Making a spring the same as factory length in 20 different weights is just to expensive.

You can use shorter springs to achieve more weight and bridge the gap between coil diameter / spring weights changes.



  • XJHammer

    TT Member

31 posts
Location: Colorado

Posted August 26, 2016 - 03:45 PM


Call pro action. I've used them for years

  • yz250f 78

    TT Bronze Member

180 posts
Location: Ohio

Posted August 27, 2016 - 06:34 AM


We run full factory connection suspension. They have experience. We are overly happy with there setups!

  • NorCal

    TT Addict

3,439 posts
Location: California

Posted August 27, 2016 - 07:08 AM


Standard operating procedure is if the spring you are getting is 'stiffer', it will most likely be shorter too, if from RaceTech.

 

Sometimes the same, sometimes different from other companies.

 

If you look on RaceTechs site, it lists the spring dimensions for every weight spring, so they are telling you in advance.

 

Same for most others.

 

Making a spring the same as factory length in 20 different weights is just to expensive.

You can use shorter springs to achieve more weight and bridge the gap between coil diameter / spring weights changes.

 

 

Yeah I totally understand that. I spoke to the Factory Connection guys and they

said the new spring length should be plus or minus 3-5 mm. The stock spring

measured 470 mm and the Race Tech spring came in at 457. According to the

FC guys, their spring comes in at 472. 

 

I am by no means a suspension expert, but that 13 mm variance doesn't seem

right. I think I'm going to return this Race Tech stuff and go with Factory Connection



  • stevethe

    Get Help Now

5,214 posts
Location: California
Garage View Garage

Posted August 27, 2016 - 07:15 AM


Yeah I totally understand that. I spoke to the Factory Connection guys and they
said the new spring length should be plus or minus 3-5 mm. The stock spring
measured 470 mm and the Race Tech spring came in at 457. According to the
FC guys, their spring comes in at 472. 
 
I am by no means a suspension expert, but that 13 mm variance doesn't seem
right. I think I'm going to return this Race Tech stuff and go with Factory Connection,


I wonder if you should call Enzo. They carry the factory KYB springs and should be about the same price as everyone else.

  • NorCal

    TT Addict

3,439 posts
Location: California

Posted August 27, 2016 - 07:17 AM


I wonder if you should call Enzo. They carry the factory KYB springs and should be about the same price as everyone else.

 

 

Wouldn't be a bad idea. I'll give them a call and see what they say. 

Thanks!



  • Not sponsored

    TT Bronze Member

102 posts
Location: New Hampshire

Posted August 27, 2016 - 02:09 PM


I had fc revalve my fx, can't comment about the forks as the springs were left stock but the rear went up to a 6.1 and and the fc spring was considerably shorter than stock.

  • grayracer513
42,878 posts
Location: California
Garage View Garage

Posted August 27, 2016 - 03:02 PM


There are three ways to make a spring have a higher rate if everything else stays the same:

 

  • Shorten the spring
  • Reduce the number of coils
  • Increase the diameter of the wire


  • Sheriff245

    TT Titanium Member

2,274 posts
Location: Quebec

Posted August 28, 2016 - 03:25 AM


A different length spring is not a problem as long as the preload is set correctly. You should aim for 4-6mm of preload. The snap ring is pretty easy to take off with snap ring pliers.

If you insist on having the same length spring, you can get a genuine KYB spring through Technical Touch USA or from your Yamaha dealer (Yamaha offers different spring rates as optional parts).

  • grayracer513
42,878 posts
Location: California
Garage View Garage

Posted August 28, 2016 - 06:41 AM


Or Suspension Direct. 



  • Sheriff245

    TT Titanium Member

2,274 posts
Location: Quebec

Posted August 28, 2016 - 07:01 AM


Or Suspension Direct.

I wasn't sure what brand of springs they were selling that's why I left them out. You could consider them as well.

  • NorCal

    TT Addict

3,439 posts
Location: California

Posted September 05, 2016 - 07:59 AM


So I installed some Motion Pro speed bleeders and all they

did was spew oil out of them after I release pressure. Any idea as to why?



  • Not sponsored

    TT Bronze Member

102 posts
Location: New Hampshire

Posted September 05, 2016 - 02:36 PM


So I installed some Motion Pro speed bleeders and all they
did was spew oil out of them after I release pressure. Any idea as to why?

Were you sitting on it or was is cranked down with tie downs at the time? From what I understand your only suppose to release the air when it's on the stand with suspension extended.

  • NorCal

    TT Addict

3,439 posts
Location: California

Posted September 06, 2016 - 09:19 AM


Were you sitting on it or was is cranked down with tie downs at the time? From what I understand your only suppose to release the air when it's on the stand with suspension extended.

 

 

Yeah.... on the stand, forks fully extended.... still spewing oil. 







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