anyone know anything about quad bike engines?

[Sidewinder]

Thing is mate, it's hardly a mass produced engine is it!

Same as those Steps plays with, they may start as mass produced, then they are tinkered with.

A bog std quad engine will be pretty basic really.

 

[sprocketflup]

I agree there aint much can go wrong with a 2 stroke, spark fuel and air and it should fire.

Incidentally, I have not long finished reading 'Motorcycle Tuning - Two Stroke' by the late great John Robinson, toatlly irrelevant to me these days as i havent got a stroker anymore, but just enjoyed reading about all the technicalities of improving the beasts

 

[Sidewinder]

Looks like I'll be "playing" with a 2 stroke tomorrow, eldest daughters boyfriends won't start on the button still.

Looks like faring off, check the wiring and starter!

Why do I get roped in to these things...

It's already had a new battery, will bump pretty easily, and runs sweet as a nut once started.

It is just cranking slowly.

 

[Andy™]

you could always call round mine once your finished SW... itll only take about 5 hours to get here...

 

[steptoe]

sprocket,

excellent book, read it many moons ago, still dont understand half of it though, :|

 

[PC Electrics]

[quote name='Andy

 

[steptoe]

try turning it over with the plug removed and the carb off,

may be a load of fuel in the bottom of the cases.

hopefully it will be fuel and not engine oil anyway.

 

[Nicky Tesla]

6 cylinders pahh! how about 48

https://www.youtube.com/embed/6ratfuML9QA?feature=oembed

 

[Sidewinder]

Well, pulled the faring off and there on the bottom of the crankcase was this pathetic little lump smaller than a pop can that was the starter!

Inertia unit so no solenoid, single connection.

Guess what, loose, burnt, corroded & overheated!

Cut the wire off drilled the head of the off to get the old crimp off the connection after removing the starter, quick clean up with spray cleaner in and out, SMALL dab of grease for the bushes.

All back together after cleaning up the connector with a nice new crimp, brass screw, washers & nut.

Starts fine, blat fattery, charged over dinner, now they will be calling him arfur as in arf a crank it jumps into life.

All back together with loads of vaseline.

He can now tell his now it all mates that it was not the spark plug after all!

I did tell them the first time I heard it what the problem was, but as usual the pups would not believe the old fogey!

"Old Age & Treachery Will Always Overcome Youth & Skill"

 

[Andy™]

doing better with it than me SW, too much other stuff to do, never got round to doing anything with it, apart from moving it out the way

 

[Sidewinder]

Well, it was going to be this am, but him & Miss SW Snr went out for lunch with his parents. (They paid!)

I was happily minding my own business when an 0844 no rung my phone, here we go I thought, what are they selling now?

It was the big local hotel KME looks after, with a breakdown, about 11/11:30 ish this morning.

I had promised him cover, & he got it!

3 hours outside in the pouring rain fixing the rubbish compactor because Chef would not allow the rubbish to build up, and they have a big do tomorrow night apparently!

Anyway, temp repair done, could not get all the bits, kept KME's customer happy, and the hotel, so perhaps more for both of us.

As I was already cold, wet & dirty & rung the Jnr's and said if he wants to do the bike now I might as well.

No rushing, no stress, well not for me anyway, he struggled with getting some screws back into the faring, all done now, & he is happy, so is Mrs SW Snr.

So, now then Andy, what are you paying! ] :x

 

[steptoe]

I'll go too SW,

if Andy is buying a night on the beer

 

[Sidewinder]

I'll pick you up on the way then!

 

[steptoe]

hope he realises you drink a helluva lot more than me!!!!!

 

[Sidewinder]

Nae mate never!

 

[wozz]

6 cylinders pahh! how about 48
https://www.youtube.com/embed/6ratfuML9QA?feature=oembed

I watched a bit of the video then got distracted and started watching the ones on the right, one thing lead to another 15 mins later im still watching americans with ships horns on the back of their pick ups. I will see what ebay can turn up!

 

[apprentice87]

Hi All,

To get back to the quad bike;

if it has;

1, fuel

2, compression

3, a spark

4, the timing is right.

Then, assuming the exhaust is not blocked solid, likewise the exhaust, it MUST go!!!

You say it has a spark....Having a spark OUTSIDE the cylinder, is VERY different to having one IN there. You might rest the plug on the head, and have a lovely spark, when it is under compression in the cylinder, the increased voltage required to fire the plug VERY often leaks away without jumping the gap.

In the same way, you might IR test something and have a very different result depending on whether you use 100v or 1Kv.....

Try a new plug, and a new suppressor cap too, you might just be very surprised!!!!!

Another thing that often works is to heat the plug up with a blowtorch and quickly refit it, that starts most things!!!!

Do not forget either, that being a two stroke the crank case might be half full of stale fuel and the thing is flooded to death...this will not help!!!! Take the plug out, short the HT lead to earth so as not to damage the ignition system, hold the throttle full open and kick it over lots or spin it for a while on the starter if it has one, to help it clear its self.

john...

 

[steptoe]

Goodish post John, except, NEVER short the HT lead, it could damage the coil,

But so check the plug cap, should it be R or not? will make a big difference under compression, esp if the plug is not standard.