Alternate layshafts/slippers for the Lazer?

[EvolutionRevolution]

Anyone know whether the layshaft with slipper assembly from other cars will fit into the Lazer? I would like to install a slipper in my cheapo Lazer, but sourcing the Kyosho parts looks difficult and really expensive. Another option would be a slipper that fits onto the stock 5.5 mm hex shaft...

[Jay Dub]

Sounds like you have a Lazer 2000 (hex shaft). It is the only car in the series with that layshaft BTW. Finding a replacement will be hard. Pieceing together a ZX top shaft with slipper spur shouldn't be too hard (my recommendation btw) but not "cheap". There is no other readily available layshaft for the car either. Most of the other slipper options are additions to the ZX layshaft, so to start with the one you have is even worse, as there is nothing that carries over. -Jeff

[EvolutionRevolution]

Meh...looks like I'll have to investigate how to reverse the one-way-bearing on the Pureten EP slipper set - it's probably the correct length and the pulleys are the same size, but the belts are swapped left-right between the two chassis.

[Mr. ED]

lock the one-waybearing out and use the type of one way that replaces the internals of the geardiff

[isobarik]

I can get the law12 for you, complete slipper from kyosho but

IT will not be cheap 95 plus shipment

and you have to have the la-11 pulleys ( hard to get )

and the oneway pulley if you get that in alu you just nead 1 la-11

then if you would like to have an kimbrough style spur you need an sleeve or la-118.

Kimbrough style spurs in the right size 100t/48p are easy to get from http://www.rwracing.co.uk

Then it will look like this



mvh Isobarik

[Kyosho Fan2]

Seems someones forgotten my spur gear design. RWracing make it with a B4 hex on either side and also has the twelve zx slipper balls and fit all zx/zxr varieties. However im looking into how to better the system as there are issues with the slipper coming lose after one race using a 5.5

Anyone else tried something like this?

[Jay Dub]

So you are using a spur with B4 hexes on the sides (I have seen the pics) in the standard ZX layshaft without balls. This is how I assumed the setup was. I imagine a front to rear bias based on the type of material used (ala kyosho different colored pads). I am suprised the slipper/diff loosens during the run. Is it loosening, or wearing? If it is loosening, you might try a thrust bearing and belville washers to replace the stock spring assy. I know is shouldn't make any difference because the drive hub is keyed, but I don't know what elsa could be coming loose? -Jeff

[Kyosho Fan2]

Im using sc10 extra torque slipper pads so there is no bias. Im using the zx four black washer springs and washer clamp and that isnt really designed for constant fractional slipping and is the cause of the problem. The layshaft is only so long and i cant fit the hyperclutch thrust bearing and spring to the zx layshaft as there is no room. Im kindof stuck as a b4 slipper plate wont fit as its a hex shaft on the b4 so anyone have an idea on if there are springs out there that are smaller than the hyper clutch but with the same circumferance?

[isobarik]

Welsh nope not forgott but i told what i can provide.

Btw the LA-55 is that the stockslipper axle ???

btw 2 nuts ?? dont fit i guess but i have seen that on the tamiya 501´s
On one of my lazer with the stock slipper the guy that owned it before me used an spring looks like the standard stuff just kind of compresed.....

here is an pic.



mvh Isobarik

[Kyosho Fan2]

Iso,

Problem is the zxr mk1 layshaft has two flat bits so the front plate slots on, and this means the spring wont go on further so I cant use it. Also there is no thrust bearing and that helps and aides the slipper system so it wont loosen off the slipper. There must be another solution to get this working properly.

[EvolutionRevolution]

Okay, got a bit further:

What doesn't fit:
- Kyosho TF2/3 layshaft + original spur gear holder: layshaft too short.
- TF2/3 slipper set in original configuration: spur holder sits too close to gearbox center.
- TF2/3 slipper set with the slipper reversed: threaded portion of layshaft at side of slipper too short to install thrust bearing & spring assembly (so close to a working solution ).
- Cross TF2/3 layshaft + Cross universal spur gear holder: layshaft too short.
- Optima layshaft + TF2/3 slipper set: layshaft diameter too large for slipper.
- Optima layshaft + TF pulleys: layshaft diameter too large, no way to attach pulleys to layshaft.

What might work:
- TF2/3 layshaft + TF4/KX-One spur gear holder: need to permanently bond pulleys together, no slipper possible.
- HPI RS4 layshaft + HPI 14T one-way pulley + original puiley: Likely works, but A) 14T one-way pulley for RS-4 is impossible to find, B) stock Kyosho pulley needs modification so it can be pinned to layshaft, C) HPI RS4 slipper set is impossible to find.
- Original Lazer Alpha layshaft & pulleys with homemade slipper: This looks promising. If the thrust bearing/spring assembly is fit between the spur and the pulleys, inside the gearbox, and I can find a slipper that fits onto a 6 mm shaft (the layshaft hex is 6.1 mm at the corners), it will probably work.

[Mr. ED]

next: to find a large enough spur to function with your slipper.

[EvolutionRevolution]

next: to find a large enough spur to function with your slipper.

I don't think that will be much of a problem...my favourite solution would be to find (or make) a sleeve that fits over the hex, onto which I can slide a spur gear holder/slipper that uses 1/4 x 3/8 inch bearings. Such bearings do in fact fit, but are just too loose without a sleeve. The center hole of most spurs also fits such a bearing.

Technically, it probably would be easier to make it a true third diff, using a design similar to a pan car diff.

[Mr. ED]

I think I understand: you(re gong with the single pad slipper design?

[EvolutionRevolution]

I'm not sure yet...if I can find two additional Lazer Alpha spurs, I could modify them to become the two halves of a two-pad design (making some handy use of the way they slip onto the layshaft) and I only need to make sure the spur is seated properly on the layshaft. I'll need to check whether the Alpha spurs are stiff enough to pull off the trick.

Time will tell.