lazer zx gearbox help

[rob m]

hi all, i have just finished stripping cleaning and re building my lazer, i think its a zxr but not 100% with that, the part i need help with is the assembly of the main shaft. ive assembled it from memory.

starting from the spur gear side, i have......

lock nut
limiter coller
4 wave washers
guide plate
slipper plate
spur gear with balls
slipper plate
rear drive hub
drive pulley
pulley flange
8mm o/d x 4mm i/d 1.5 thick washer
thrust bearing
8mm o/d x4mm i/d 1.5 thick washer
E ring
drive pulley
pulley flange
shim
front drive hub
limiter collar
lock nut

hope all this makes sense. the part im not sure about is were i have put the thrust bearing between the two washers. i have downloaded a manual and no thrust bearing mentioned, just a collar. but i don't have a collar that fits. so if anybody can point me in the right directionwould be much appreciated.
thanks, rob.

[Naushad]

Some pictures woukd be helpful.

[rob m]

ok, i will try get some pics up when i get time to strip gearbox down.

[rob m]

ok, i will try get some pics up when i get time to strip gearbox down.

[Welshy40]

There is a grey bushing in the central spur gear hole. There is a bushing in the hub going into the motor plate. Theres two options between the layshaft pulleys, i prefer the thrust washer to a solid bearing but the bearing does work just as well. So for a bearing measure the inner thrust plare washers inner hole and also the outer diameter in mm's and then you should be able to find a bearing. Be warned you may find the bearing works better without the e clip on the layshaft

[terry.sc]

Rather than people trying to guess whether it's correct or not, here's the ZX-R manual.
http://www.retromodelisme.com/manuel_page/52/lazer-zx-r-kyosho.html

Layshaft part1
http://www.retromodelisme.com/scan_pages/1643/lazer-zx-r-kyosho-page-8.html
Layshaft part2
http://www.retromodelisme.com/scan_pages/1643/lazer-zx-r-kyosho-page-8.html

[rob m]

There is a grey bushing in the central spur gear hole. There is a bushing in the hub going into the motor plate. Theres two options between the layshaft pulleys, i prefer the thrust washer to a solid bearing but the bearing does work just as well. So for a bearing measure the inner thrust plare washers inner hole and also the outer diameter in mm's and then you should be able to find a bearing. Be warned you may find the bearing works better without the e clip on the layshaftHi Welshy. I
Forgot to mention them bushings, They are in my build. have i done the thrust bearing part correct? With the two 1.5 washers either side of the thrust bearing? Thats the part im unsure about and is not shown in manual .
Thanks for the replys :)

[terry.sc]

The thrust bearing is not shown in the manual because it's not supposed to be in there. In yours all it is doing is acting as a spacer.

[rob m]

The thrust bearing is not shown in the manual because it's not supposed to be in there. In yours all it is doing is acting as a spacer. why would the spacer be changed to a thrust bearing?. Does anybody know the length of the spacer please so i can make one?

[terry.sc]

Reading through your first post again it's not a ZX-R slipper you have at all, it's the ZX ball diff. Seen the words ZXR and mentioning slipper parts in your original post and mistook it for the ZX-R.

The thrust bearing works with the centre ball diff, the layshaft has no slipper function. Try running the ball diff loose enough to act as a slipper and you will have no drive. A common mod was to take the balls out of the spur gear and tighten up the diff nut to lock up the diff.

The correct manual is here
http://www.retromodelisme.com/manuel_page/24/lazer-zx-kyosho.html
From your description you have not listed the spacer that goes inside the rear drive hub, although I presume you will have missed the spacer being a separate part as it fits in flush with the drive hub.

[rob m]

Reading through your first post again it's not a ZX-R slipper you have at all, it's the ZX ball diff. Seen the words ZXR and mentioning slipper parts in your original post and mistook it for the ZX-R.

The thrust bearing works with the centre ball diff, the layshaft has no slipper function. Try running the ball diff loose enough to act as a slipper and you will have no drive. A common mod was to take the balls out of the spur gear and tighten up the diff nut to lock up the diff.

The correct manual is here
http://www.retromodelisme.com/manuel_page/24/lazer-zx-kyosho.html
From your description you have not listed the spacer that goes inside the rear drive hub, although I presume you will have missed the spacer being a separate part as it fits in flush with the drive hub. thankyou Terry,sc :thumbsup: my mind is now at rest knowing i have assembled the drive correctly. it helps using the correct manual, silly me:blush:.

[rob m]

The lazer is built, just need to find a servo plate so i can then add the electrics, new shell and then enjoy :). The last pic is my attempt to add strength to the front gearbox casing as ive noticed in my box of parts a few broken cases.

[terry.sc]

The ears break off the front gearboxes when it rolls in a crash, the top of pne shock mount hits the ground and twists back to twist off the gearbox mounting point. For a runner replacing the shock mount with a fibrelyte part that has a bridge between the two upper points greatly strengthens the gearbox mounting points as it transfers the load between both ears.

[Welshy40]

As per Terrys comments. I prefer the section on fibrelytes website (link below) under kyosho, lazer Zx there is a semicircular handle type mount. Thats the strongest and i use. Also comes in handy when you roll as you almost always roll back onto your wheels

[rob m]

I do have these not sure who they are made by think i was told the top deck may be a wasp item?, my thinking was that the alloy ones would bend and take the impact away with them bending. I will take the advice and fit then instead, . I used to have a carbon chassis aswell but sadly snapped :-(

[Welshy40]

Those shock towers are sufficient. The top deck is either a wasp or HPI, but carbon fibre is better and much stronger than alloy.

[rob m]

i am now wanting to get a a new shell and under tray for my lazer, but before i do, i would like the advice and experience you guys please. i am aware kamtec do an la122 shell, but looking at the picture it looks like a mk5 lazer rtr shell?. Also i was kindly put in the direction of bluegroove in canada. they do a zx-r shell and under tray. Are any of these shells capable of the knocks and bangs of racing? what i would like is a zx shell to keep things original but not managed to find one.

[Crashtest33]

Hey mate.
Kamtec do the Lazer ZX-S LA-122 shell which is a bit thin and crap in places. :thumbdown:
TBG do a Lazer ZX and ZX-R shell and undertray and I'm afraid it's a bit of hit and miss. I've ordered several of both with mixed results. Just hope you don't get a Monday morning/Friday afternoon one. :thumbsup:

Nick

[Welshy40]

Nick i doubt your zxs shell came from kamtec.

The zxs shell is much thicker than the original and lasts a long time. Im still using the first production shell ever made, and still looks new. Its taken one hell of a beating as well. The shell comes with an undertray as well and is good as well.

Team blue grove does a thin shell and undertray and not good for racing, only good for a shelfer. I used five undertrays from blue grove when using the kamtec tomcat shell which is a wider shell and looks nicer than a zxr. The undertrays were breaking up after each round so i would recomend getting the tom cat shell and waiting a while until my molds finished for the carbon fibre tub chassis then you wont need an undertray.

I will find a picture on the lazer thread and post the link but kamtecs link to the shell (no undertray yet) is here. Thats the first shell ever made and i still have it on my car.

http://www.kamtec.co.uk/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=503&category_id=8&option=com_virtuemart&Itemid=53&vmcchk=1&Itemid=53

Also cant find a picture of my car but here is another one.

http://www.oople.com/forums/showthread.php?p=734860

[isobarik]

I do have these not sure who they are made by think i was told the top deck may be a wasp item?, my thinking was that the alloy ones would bend and take the impact away with them bending. I will take the advice and fit then instead, . I used to have a carbon chassis aswell but sadly snapped :-(

top deck

HP i have one of thos looks cool.

mvh isobarik