Broken rollers

[bazzaboy2010]

August 2020 I bought some new rollers and belt from max Honda spares on eBay. Well yesterday I broke down and at full throttle I have hardly any revs and no drive. Got the bike back home and took a look if the belt was broken which clearly would not of being any thing to do with the Rev problem anyway. But the belt was ok. But wha5 I could not believe which you will see in the picture is the state of the rollers that was removed. So now I am worried that because they look like this it is now ruined my engine.

[WD Forte]

How has that ruined the engine?
I only see 4 rollers where's the other two?

looks like a case of buy cheap buy twice to me
Best case, new rollers
Worst case, just buy a new cvt set and fit it.
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bikers smell of wee

[steve the grease]

Cheap parts off ebay. Tell meall about it.

New lower arms for my car "Quinton Hazell" brand ( used to be a respected parts brand) Original arms> 18 years. Replacement arms 8 months - rubbers perished to fuck.

Motorbike fork gaiters- perished away before I even finished doing the bike up.

Conclusion The Chinese have some way to go where rubber products are concerned.
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....

[Bazzaboy09]

Why would I have no revs after this happen?

Only took photo of the 4

[WD Forte]

is the subframe OK?
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bikers smell of wee

[Robby]

[Bazzaboy09]

[Nobby the Bastard]

The crank and valve gear are not dependant on the variator The variator is just a convenient way to turn the crank and thus the valve gear

Its the the same as using the back wheel to turn the engine.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Robby]

Is the transmission all fixed? If not, fix that before you go looking for problems with the engine. If the variator is in pieces then you're trying to start it with a seriously light flywheel. Engines don't like to run at low speed with little or no weight in the flywheel.

Always fix the problem you know about before you go hunting for more. Otherwise you go down the slippery slope and end up with a bike in its component pieces strewn across your garage floor, and up with the fun or daunting task (depending on your point of view) of putting it all back together.

[Bazzaboy09]

Put back together and still got the problem

[Easy-X]

Let's go back to basics: with the belt/variator off take out the spark plug and turn over the engine by hand. Rotating smoothly? After that it's check for spark and fuel...
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Bazzaboy09]

Well looks like the broken rollers did fxuk the engine.

[Nobby the Bastard]

Holy fuck.

There's no chance that the rollers did that.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Bazzaboy09]

Well if they jammed when I was going around 50mph. Then maybe it did.

[Nobby the Bastard]

[Easy-X]

Slight bit of stress on the engine... pop! there goes the Chinesium casting

£20 for a rocker arm assembly?
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Nobby the Bastard]

[sickpup]

The flat spots on the rollers are a normal wear pattern for rollers that didn't roll but were sliding instead. Out of interest did you grease the rollers before fitting? There are two sides to the argument, one says to grease and one says not and to be honest I'm not sure which is right.

The top end damage wasn't caused by the rollers, it was caused either by the piston hitting a valve or lack of lubrication to the top end. As the cam caps look like they are bolted down fine it is unlikely caused by a bad casting.

Nothing here really helps you out, you will only find the cause as you strip the engine.

What scooter was it?

[jeffyjeff]

[sickpup]

[jeffyjeff]

Consider the mechanism beyond the rollers. The rollers control the position of a sliding sheave which drives the belt at various ratio dependent on engine speed. The sheave in turn drives the rear wheel which is the load that limits engine rpm. Once the rollers are destroyed, all load on the engine was lost. Without load, the engine is permitted to accelerate uncontrolled until kapow!! (bad things happen) It is a balanced system, and I agree that rollers do not control engine speed directly. But the speed ratio of the variator and rolling resistance do limit engine speed.
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History shows again and again how nature points out the folly of men - BOC

[wr6133]

[sickpup]