Minibike Springs working with KX65 shock.

10456 Views 19 Replies 4 Participants Last post by pookiebear, May 2, 2009

Luckystar64

Discussion Starter · Jan 17, 2009

So I had Rob at MBS on the phone yesterday, great guy by the way! I was discussing the fine tuning of my KX65 front end, oil weight, and height, etc... I'm already using his springs in the KX65 front that I've got on my 110. It works great, so I know my 65 front will be great too.

He tells me that he's working on getting a spring dialed in for the stock KX65 rear shock. I told him that PR2 said that they can't see how they would get the valving right on the stock piece for somebody that weighs 150+ lbs. Rob says that he was going to have his guy do what he can with the valving, then re spring it to see how it feels. I was going to send my stock shock to him to see what they can do with it. If they can get something done that works reasonably well for around $200 or so, then for $300 ($200 for the shock, and $100 for front springs), an adult can ride a used KX65 for $1500.

We need somebody to make a +10mm shifter for it now. --L*64

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pookiebear

· #2 · Jan 18, 2009

good plan. I got the minibikesprings in the front of mine too. Works good. I still have my stock back shock sitting in a box. Let me know how it works out.

Z50King

· #3 · Mar 18, 2009

since you are the most recent person ive seen that has talked to him, what do front springs cost from MBS, and do you know what spring rates he has available?

sorry to bump old thread and ask

Luckystar64

Discussion Starter · #4 · Mar 18, 2009

He has .43 springs available in all KX65 fork lengths. If you need a different rate, call Cannon Racecraft. They have many available rates. How much do you weigh? --L*64

Luckystar64

Discussion Starter · #5 · Mar 18, 2009

Oh... They're about 100 bucks from MBS. Be careful on what rate you use-- the 65 seems very sensitive to the rates you use. Make sure the front and rear match. --L*64

Z50King

· #6 · Mar 18, 2009

i read somewhere that he had .43 kg/mm spring rates. i was wondering if he had others

that sounds way too stiff for me as the stock is .26 kg/mm and they are almost stiff enough for me with a 1 inch spacer on top of the spring

i weight 185 in full dress

teddy

· #7 · Apr 15, 2009

I have a KX65, road raced for the last two seasons, i weigh in at 200lbs, i'm fairly fast

I have been running the .43 minibike fork springs, i'd like them a tad stiffer. I had Home - Tech-Care Suspension install and tweak gold valve emulators with 20 weight fork oil!!! They also re sprung my rear stock shock 6.2kg and tweaked the stock valving, running 30 weight oil, lowered internally 1"!!!

This bike is excellent/competitive on the following tracks:

Palmyra speedway

Jackson speedway

Beaverun

Circleville

G&J kartway

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Z50King

· #8 · Apr 15, 2009

teddy said:
I have a KX65, road raced for the last two seasons, i weigh in at 200lbs, i'm fairly fast

I have been running the .43 minibike fork springs, i'd like them a tad stiffer. I had Home - Tech-Care Suspension install and tweak gold valve emulators with 20 weight fork oil!!!

springs and emulators and they are still too soft for you?

teddy

· #9 · Apr 16, 2009

Just a tad soft..... my bro has .46 fork springs and its a world of difference! the rebound and dampening is great its just the spring rate is to soft for my tastes, we have the same set up just diff spring rates...... he got his from cannon craft. mine from minibikesprings.

I'll be riding this on a lot more dirt & sumo proper this summer........ and might have to buy the stiffer springs?

Luckystar64

Discussion Starter · #10 · Apr 17, 2009

Ted-- How are you controlling the rebound with those stiff springs in the 65 forks? I accidentally ran the MBS .43 springs in my 65. I figured they were perfect on my 110, so they'd be perfect in my 65. Not so-- the rear shock on my 110 is way stiffer than the Fox that I'm running on the 65, and the 110 is at least 30 lbs. heavier than the 65.

When I ran the .43's in the 65 forks, the front rebounded way too quickly, and way too hard compared to the rear, and looped the bike out big time. I'm running .36's now, and it's alot better. The .36 springs are not as far away from the .27-.29 springs that the forks are made to be able to control as the .43's or .46's. I was thinking about getting the holes on the damping rods welded and re drilled. --L*64

teddy

· #11 · Apr 18, 2009

Yeah you can have them welded and re drilled, very few people know the magic behind that...... its an option for sure. Thermosman is really good with these bikes. his number can be found at supermotojunkie...... PIT-Boy and other semra racers use him!

I chose the Race-Tech emulators and have no complaints. Tech-Care fiddled with them..... yellow springs for my girth.......

The dude that owned my bike previously looped it over a jump going into the power..... ACL torn........ DOH........

Now with the motor all rebuilt etc... the power is great and super predictable as stated in the other thread......

You need to come over and ride with us.......... pm for details

!

Luckystar64 said:
Ted-- How are you controlling the rebound with those stiff springs in the 65 forks? I accidentally ran the MBS .43 springs in my 65. I figured they were perfect on my 110, so they'd be perfect in my 65. Not so-- the rear shock on my 110 is way stiffer than the Fox that I'm running on the 65, and the 110 is at least 30 lbs. heavier than the 65.

When I ran the .43's in the 65 forks, the front rebounded way too quickly, and way too hard compared to the rear, and looped the bike out big time. I'm running .36's now, and it's alot better. The .36 springs are not as far away from the .27-.29 springs that the forks are made to be able to control as the .43's or .46's. I was thinking about getting the holes on the damping rods welded and re drilled. --L*64

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Z50King

· #12 · Apr 18, 2009

Luckystar64 said:
Ted-- How are you controlling the rebound with those stiff springs in the 65 forks? I accidentally ran the MBS .43 springs in my 65. I figured they were perfect on my 110, so they'd be perfect in my 65. Not so-- the rear shock on my 110 is way stiffer than the Fox that I'm running on the 65, and the 110 is at least 30 lbs. heavier than the 65.

When I ran the .43's in the 65 forks, the front rebounded way too quickly, and way too hard compared to the rear, and looped the bike out big time. I'm running .36's now, and it's alot better. The .36 springs are not as far away from the .27-.29 springs that the forks are made to be able to control as the .43's or .46's. I was thinking about getting the holes on the damping rods welded and re drilled. --L*64

i just got a set of .43 springs from FEAL and am planning on installing them soon. Odi told me to run 20 wt at 100mm from the top. are they going to pogostick like you are talking about without the rods being closed up?

teddy

· #13 · Apr 19, 2009

all you can do is try it.

I ran just the springs and 20 weight oil......... not bad but kinda springy.... having the stock valving re worked is an easy option...... some people Epoxy the holes and re drill untill they have the magic sweet spot......... Welding is a better solution but hey its a minibike......

Luckystar64

Discussion Starter · #14 · Apr 19, 2009

Z50King-- How much do you weigh? What are you using the bike for? Odi is pretty good at Feal. Ask him about it and see what he says. ---L*64

Z50King

· #15 · Apr 19, 2009

Luckystar64 said:
Z50King-- How much do you weigh? What are you using the bike for? Odi is pretty good at Feal. Ask him about it and see what he says. ---L*64

i weigh 190 or so in full dress. mainly ridden on mx and sx style minibike tracks

Luckystar64

Discussion Starter · #16 · Apr 19, 2009

Oh, Ok. For 190, the .43 springs are probably right. What are you doing out back? Be careful on the 65 though, it's a little scary to jump.

I'm getting better, but I watch what I do. It isn't like jumping a 110. I've been setting the speed that I'm going to jump at beforehand, then jumping with an even throttle, I have yet to just pin it and jump like on my 110. The 65 is scarier-- haha! I'm kinda scared of it. I'm more aggressive on the 4 stroke. --L*64

teddy

· #17 · Apr 19, 2009

yup jumping the 2S, you have to have your takeoff speed set, and coast through the air

other your gonna lOOp it

Z50King

· #18 · Apr 19, 2009

Luckystar64 said:
Oh, Ok. For 190, the .43 springs are probably right. What are you doing out back? Be careful on the 65 though, it's a little scary to jump.

the bike im speaking of is a 110 with 65 forks on it. the rear has an lt metaltek swinger with racetech long shock

Luckystar64

Discussion Starter · #19 · Apr 19, 2009

Should be plush for your weight-- I'm 170 with gear, and my 110 is nice, but on the firmer side.

Ted-- Yeah, I gassed it off the lip, and looped out.... hahaha! --L*64

pookiebear

· #20 · May 2, 2009

I had the .43's but I weigh in at 220 with gear on. Doc just told me to drop it to 180. going down to the elliptical now.

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