Villiers 4 stroke devil juice engine

[julianf]

I have one of these -


Its an ancient (non recoil start) Norton Villiers F15 Side Valve 4 Stroke, with B10 Carb.

When i got it, it had no compression at all.  Took the head off, and, sure enough, stuck valve.

Worked that, and now opens and closes fine.  Will spin in the guide, but the top of the pison, valves, all looked pretty mucky, so im not sure how well the valve is seating (seems ok, but i just dont know how much compression it should have, and have no tools to measure).  Cylinder bore looked fine.


Anyhow, i still cant get it to start.

Its not easy (for me) to pull a non-recoil starter, and look at the spark at the same time, but i alreddy managed to make myself jump, electric fence style, so i assume something is kind of working there.


So, then onto the carb -

The throttle linkage does nothing at all.  The carb seems to be sprung in the same way as the linkage from the 'handle bar' control pulls.  Ie the carb is naturally sprung one way, and the linkage just tries to pull it the same way - which evidently cant be right.

But that's as far as ive got.

This is the beast the engine is on (well, off, at the moment) -




(ive just sorted the hydraulics for the trowel profile, so im now keener on getting the engine sorted)

[therecklessengineer]

Can you post up a photo of the carb and linkage?

They're normally linked to a flap that has a force acting on it from a fan on the flywheel. You end up with a rudimentary governor type arrangement.

[Keef]

There is a slim chance I've got a manual for this engine!

I had a monster rotorvator years ago that had a Villiers engine that looked very similar to yours so

a] if it was the same engine
b] if I can find the manual

I'll let you have a copy of it at the BBB

[julianf]

Nice - thank you.

Its one of those annoying ones where everywhere online purports to have the manual, and then wants you to pay.

I dont want to pay £12 for a photocopy - that's more than 1/3 of what i paid for the whole device.

[julianf]

Can you post up a photo of the carb and linkage?

They're normally linked to a flap that has a force acting on it from a fan on the flywheel. You end up with a rudimentary governor type arrangement.

Ill go out in the rain and take a photo of it for you... Gimme 5.

[julianf]

This is the engine with the throtle control slackened off -



This is it with it with it tight - just pulls the spring, but not the lower lever -



If i put my finger in, and push the lever down, then you can see the linkage to the carb does 'somthing' (ie if you look at the back of the carb, there is a change) -




Here is a shot of the back of the carb -



And the same with the lever manually activated -



(there's a possibility that these last two are the other way around, but you get the idea!)

[julianf]

This video on youtube shows some 'stuff' but i cant quite work out what -

https://www.youtube.com/watch?v=GLkrHLSE_Mw

ffwd to about 1min 50.

Obviously its a different linkage, but i feel like i should be able to work it out from that... but i need assistance! : )

[oakwoodtv]

The bottom spring goes to the guvnor when or if you get it started as the engine
gets up to speed the lever coming from the bottom of the engine will pull on the
spring closing the butterfly valve in the carb.

The guvnor spring and the throttle spring work together to regulate the speed
not very accurate tho they tend to hunt.   

[julianf]

Thankyou.

Just went to repair the fuel tap that was dripping, in order to put some more petrol in it, and investigate further, only to find that it wasn't the tap, but pinholes in the tank : (

Unsure of the best plan now.  Whole engines are not much more than 60 notes so i need to be carefull spending too much on this one, esp as I think a modern Honda would probably fit.

[oakwoodtv]

Do you knead it to be petrol an eclectic motor is far less hassle and cheaper to run.   

[julianf]

Probably either is fine.  Could always add static weights.  I don't know what HP the original is though - might be beyond 13a 1ph motors.  I'll look it up.


edit:

Im not sure a simple replacement would be a great idea, as it happens -

The device needs speed control.  Its not flat out all the time, over the whole job.  Speed control on an electric motor, without loosing torque, will be a whole load more stuff - it would be easier to just replace with another petrol engine than muck about to that extent.