pe rear shocks

[666 SOS]

due to weight gain (me not bike ) rear shocks need a upgrade on my pe and im in process of building
a perm 400 the shocks are 16.5 inch or 410mm if anyone has any ideas on budget shocks it would be great


                                      cheers PLUM

[YSS]

E 302T  $499 per pair    www.yss-suspension.com   

[mainline]

are these the budget evo shocks you mentioned were on the way a little while back?

[YSS]

No ,you mean the E362 , Z362 and G362 series. They will be be presented when I get back to Australia in two weeks.

[LWC82PE]

correct length for PE 400 is 400mm eye to eye with 128mm travel (metal to metal)  give or take 1-2mm. Make sure what ever shocks you get that you get correct eye to eye length and correct travel

too much travel and the tyre will rub through the rear mudguard and air box and the sprocket will dent/scrape the rear muffler. also make sure the springs dont extend right up to the top eyelet mount otherwise the springs will rub through the air box or the shocks will not fit all togehter depending on the OD of the spring.  you will notice on the side of the airbox where there is moulded dimples to allow for the springs. This can sometimes be fixed by putting spacers inbeteen the frame and airbox to pull the air box in closer to allow for more clearance. Also i know people who have heated the air box a little to be able to press the plastic in and re-shape it. Also the shocks can also be spaced out further by using a wide split reducer bushing on the inside of the eye mounts and a narrorower one on the outside

also make sure the shocks have long eyes or conical shaped lower spring retainers to space the bottom of the spring up higher away from the swing arm gusset. if the shock is not like this you have to cut the swing arm gusset out like a RM 250/400 N/T.

also if you are going for longer than 400mm remember that this will change steering geometry as well as put more of an angle on the chain as it leaves the counter shaft sprocket and can rub on the chain buffer on the swing arm pivot and wear through it a lot quicker.

i have been building shocks for my PE's for the past year and a half and have discovered many of these things on my bikes when i bought them and previous owners who didnt know had the wrong shocks on them and had done all sorts of things to fit shocks that are not right so thats how ive noticed these things.

[YSS]

Well observed Leith

[oldfart]

It's the air box and spring seperation that catches most people out as Lieth has stated . Another test is take the spring off the shock , re-attach to bike and compress the shock to see whats happening .

[LWC82PE]

yeah well when you fiddle with this stuff for as much as i have you find out a lot of things. The worst thing i had was on one of my bikes i had 2 RM shocks fitted. Both were incorrect and different lengths and both had incorrect and different amounts of travel. all this would of been the cause of finding my swing arm with a split 50mm long along my swing arm pivot so i had to source another. but hopefully no else is stupid enough to fit incorrect matching shocks. Also it took me a while to work out why all the PE mufflers i get had dents and scapes underneath them and incorrect shocks were the cause of this, but this must also of been partially a problem from the factory as well as i have a magazine test on a new PE250 when they were new and the testers commented on how several bikes where experiening tyre hitting fender and sprocket hitting muffler.

yes thats what i useally do. remove the springs and compress the shock when its fitted to bike. incorrect tyre size can also cause problems. you can useually have a little extra shaft travel if you fit longer bump stops.

another key measurement is the original bump stops measure 37mm total length.

[YSS]

I am glad you can see what we have to go through to make one st of shocks 

[666 SOS]

  thanks for the info fellas up till now tassie has had mainly flat grass tracks but we now have a
a track with jumps i have found my 90kg plus has taken its toll on the shocks i had fitted (bent shafts)
but they were just cheap shit to get me racing and as i ride like epileptic emu i havnt worried about
what the back of the does but after the titles down here and seeing how smooth some of the riders were
i think i will lash out for next season

                                                   cheers plum

[LWC82PE]

Just thought I would clarify the travel on the PE shocks. Its actually physically impossible for the shock to travel the full 128mm of exposed shaft as there is a cone shaped spacer which hits the body (when no bump stop is in place) at 115mm and there is still another 13mm of shaft left down inside this cone shaped spacer and the bump stop normally covers this part of the shaft.

[YSS]

Thats right Leith 400 CTC = 114.5 stroke