Hello

After buying my crm a week or so ago I decided to give my carb a good clean to try sort out my running issues (hoping for an easy fix)
The bike had been stood for a while and was a little hard to start but I got there in the end by removing the kill switch (which was hanging off anyways) and bypassing the circuit, ( haha what a good idea I thought ) and giving the spark plug a clean followed with a quick sniff of carb cleaner in the air box!

Vrrumm started up sweet little Smokey tho??

Got on the bike and had a quick blast up and down the street too clear out its lungs a bit, it was a bit spluttery at first and still a little Smokey but soon found its feet.

Zipping up and down the street a few times I thought "its still not right??(Still a little Smokey) and decided to return to my garage, just as I was about to turn left into my garage the revs shot through the roof and a was catapulted towards a parked car. . . after avoiding the parked car and the nearby wall I thought quick the kill switch and then thought "s#*t I took it off" (doh) and grabbed the clutch leaver and went for the ignition key... and nothing happened still revving its nuts off !!!
I then removed the kill switch bypass... and still nothing happened
I then thought, "Oh crap and what do I do now?

10 seconds later it died and was sick a small puddle or gearbox oil on the floor!! The bike then went in the garage because it had been naughty and had tried to kill its new owner!!

What do I do now??? What could be wrong?

Many thanks

Josh

It's likely that the bike was dieseling. The ignition was off so there was no spark at the plug but the engine was firing off the red hot carbon deposits in the head. A good decoke would sort that out.
The pool of gearbox oil could well be from the crank breather pipe. If you are lucky there was/is too much oil in and it has blown it out. Check the level by removing the level screw when the bike is upright. If oil flows out allow it enough time to drain until it stops dripping. If you are unlucky then the crank seals may have gone.
Good luck

Yes oh dear indeed, i think the only cure maybe a good Vilguy- ing, or buy another similar and use it as a parts bin for your self.
There is no doubt, it can be fixed, but the cost may prove prohibitive,unless you are a proficient spanner wielder your self.
IN essence, the motor has revved to self destruction, almost certainly caused by un-metered air ingressing the combustion chamber. this may be caused by the reason, as Eddie suggested, and ditto the oil puddle, as undue pressure was exerted on the seals thus pressurising the gearbox, if your lucky !!!!
You may have to strip the engine completely, and rebuild to blue print standard, does the rest of the bike warrant this treatment?
That's your call unfortunately.
In the bikes defence.
Perhaps it got you confused with a previous owner who badly mistreated it, so it's probably unfair to blame the bike entirely
Mike

The oil defiantly came from the breather pipe and it didn’t sound like it seized??
(I once had an nsr 125 that seized at 100mph)
It just seemed to die slowly and not just lock up solid so it might have been lucky.

Is there a Haynes manual or something similar on the market???
I did a few years as an hgv mechanic so I should be ok I think?? :s

It was pretty similar to when a diesel starts to run on its own oil but it stopped before it went bang!

cheers

OK.. I'll be controversial..


Any chance you dident seat the carb boots properly when you reinstalled it? (easily done as it's difficult to see the other side of the boot)
causing a air intake leak at the boot? happened to me before and had same symptoms despite the diesiling...

That's where my money is anyway.
Makes sense since it's the only thing you tampered with. Might be well worth a check before you do anything drastic.....

Do they do a haynes manual or is there a somthing similar??

i am gonna change the crank seals and have a good look around to see if theres any more damage!
how much do you think all be looking in parts???

or as any 1 got a mk 2 engine for sale?? ( long shot i know!)

josh mk 2 crm wrote:Do they do a haynes manual or is there a somthing similar??

i am gonna change the crank seals and have a good look around to see if theres any more damage!
how much do you think all be looking in parts???

or as any 1 got a mk 2 engine for sale?? ( long shot i know!)

No, but you can buy a service manual from LT.. someone will probably have a PDF version here. but it really isent in depth
just a service/maintenance manual really.

I would seriously check the carb is sealed properly at the airbox and inlet manifold before messing about with crank seals. Could be a waste of money and time..especially if you are considering purchasing a new engine. If you are still convinced its the crank seals, sprinkle some talc powder on them or spray
some wd40 and see if it spits or blows off when the engine turns.