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Old April 9th, 2014, 08:46 PM   #1
nikeeric86
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Rear preload?

Those of you who still run the stock rear shock what setting do you use at the track? Don't have any one at the moment to help me measure sag but noticed my rear preload is set at the #1 position and have done 2 track days that way. I'm 150lb no gear.

Also doesn't increasing rear preload raise the rear end making the steering quicker? i'm tempted to set it at 5 when i go again next week.
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Old April 9th, 2014, 09:26 PM   #2
Alex
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I'd crank it up, and always ran my new-gen at 5. You're quite a bit lighter, but putting larger loads into it on track than most street corners. I'd imagine you'd be happiest somewhere between 3 & 5, but it will take trial and error to find what your preference is.
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Old April 10th, 2014, 04:46 AM   #3
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I think Alex got ya, 3-5 but most suspension guys will say to not make large changes. If you're running 1 now, try a session or so on 3 before 5. Although, it's kinda t it for tat on the 250.

Will increasing the preload make the bike turn quicker? Nope, need to change the ride height or tire profile for that, but changing the preload is a good placebo effect sometimes. Thing is, the better the suspension is set to your needs and preferences, the better the bike will respond overall.
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Old April 10th, 2014, 07:23 AM   #4
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found this yesterday, and found it informative at least for what kind of feedback to feel for when testing things out

http://www.visordown.com/workshop/mo...etup/2487.html

Highlights about preload both front and rear

Test 9

Maximum spring preload on the forks


Niall "The front feels all out of control under braking. The back is moving around and it doesn't feel like the front is diving under brakes. There is also a bit of chatter over bumps. Not very nice."

Jon "The bike felt okay but was slightly soft and quick to dive under braking. It didn't feel much different to standard and still cornered fine."

What's actually happening: With the springs fully preloaded the bike sits too high at the front. The forks aren't compressing enough under load and the bike isn't transferring its weight to the front wheel. Effectively the bike sits 'flatter' under braking, which destabilises it.

Test 10

Decreased rear spring preload


Niall "Trying to drive out of corners the back squatted down and the bike ran wide. When I put the power down out of slow corners it ran wide, and through faster ones, such as Schwantz's, it pogoed slightly."

Jon "The bike felt flat in corners and didn't really feel like the back end was digging in when I drove out. Under braking the rear seemed to slide around and wasn't balanced."

What's actually happening: The rear spring is under less initial pressure so when the bike's weight transfers backwards under acceleration it sags and sits down before the spring can start to work properly.

Test 11

Minimum spring preload on the forks


Niall "It wasn't so much a problem on the brakes, more mid corner. The bike wanted to fall into the corner and it felt like the front was trying to tuck all the time. Mid corner the bike felt horrible, all squidgy and wobbly on the front."

Jon "Over bumps the front felt really unsettled and the patter was back. In corners it wasn't that bad, a bit soft feeling but nothing too bad."

What's actually happening: Again, the spring isn't under as much initial pressure when the bike loads it up, so the initial movement before the spring starts to work gives a saggy, soft feeling.

Test 12

Increased rear spring preload


Niall "On the brakes the back end was all over the place. I'd hit the brakes then the rear was well out of control, it just swayed back and forth and meant I had to let off slightly to get it back under control."

Jon "The back felt hard and the bumps, especially through the Foggy Esses, gave me a right kick
up the arse. Under braking the bike didn't feel very planted and the rear slid around slightly."

What's actually happening: The spring already has pressure on it so there is less 'give' in it to absorb the new forces, or just the weight of bike and rider. This leads to a harsh ride.


Read more: http://www.visordown.com/workshop/mo...#ixzz2yUdsAYMG
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Old April 13th, 2014, 03:28 PM   #5
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If the added preload razed the rear of the bike ,with you on it, it would quicken the steering.
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Old April 14th, 2014, 05:16 AM   #6
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the top, but i weigh 180, 200 w/gear.
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Old April 16th, 2014, 06:03 PM   #7
JasonG134
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I raced the 300 for first time last weekend.

I have racetech springs and emulators, and my ohlins shock was delayed so I ran the stock shock, all the way maxed for preload.

I weigh 190 before gear.
No clue how the bike would handle, never rode it before the race weekend, and ive been racing a Gen 4 10r that has proper aftermarket suspension front and back.

Well, massive surprise...the bike handles very well! I was rubbing the hotbodies bodywork, but i was able to race flag to flag elbow to elbow with the other 2 front runners.

I only had the stock oem gearing/520 chain , they were on seasoned 250's with penkse shocks, and 415 gearing.
All 3 bikes were very equal.

Any how, i just want to say that the rear stock 300 shock is very good, even for a heavy guy like me.

But cant wait to get the ohlins and gearing on, and see what happens next time out.

Oh - I never checked my rear preload, there was no point since it was maxed out.
The front i have .85 springs. Somebody on here recommened i use .85's and the bike was on rails..
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Old April 16th, 2014, 06:07 PM   #8
JasonG134
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csmith12 - thanks so much, i just remembered it was you who passed over some suspension set up tips..

Thank you Chris! The bike handled great! Even with stocker on back...had a blast!
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Old April 16th, 2014, 06:10 PM   #9
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Glad we could help. You had a blast, that is all that matters.
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Old April 18th, 2014, 01:47 PM   #10
nikeeric86
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Went out to chuckwalla yesterday and messed with different the settings. I was happy at the #4 position but started to noticing the bike would undulate on the gas out of turn 16 and sometimes in the bowl?
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