[35 video] Is this running on 2/3 cylinders?

[MikeBb]

Before this video, all carbs were gutted, cleaned out, and bench synced.

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

Hi all, so after that video i checked all spark plugs. They all had some oil residue but were not really wet with oil. And all of them produced a spark to the side electrode when the thread of the plug was held up against the frame of the bike. Cylinder 4 (i think, front right) lead to plug connection is not very tight, but it still does produce a spark. Both rear exhaust headers were hot, as was the front right one, the front left one seemed not-as-hot, but may have cooled down in the time it took me to feel it.
After that video (with weak battery) attempts to start it shot fire out the exhaust, i think the lower can, and i couldnt get it to kick over.
I havent tested again as all my petrol made its way into a lawnmower!

I have found this video for noise comparison https://www.youtube.com/watch?v=FI52XqvqEVg , but its hard to tell, and who knows, that guy might have a failing cylinder as well!

Thanks.

[Drunkn Munky]

How old are the plugs? put the airbox back on so you got a decent chance of getting it to idle and go from there, i cant tell jack from that video

[speedy231278]

Pretty much impossible to tell, but I think you might be missing a pot. However, as DM says, until you can get it to sit still without stalling, you won't really know. The pipes do get pretty hot pretty quickly, so if one is cooler, it would suggest that pot isn't running or isn't doing as well as the others. Unless it's set up to run without the airbox, it's probably going to sulk anyway....

[MikeBb]

Thanks guys.
Put the airbox on, shortened the fuel line so its as long as it needs to be. And charged up the battery. next attempts at starting are here: (vid still uploading)

http://youtu.be/aAzUM5Hm6Q8

I was only able to get it to sputter once or twice a couple of times like this. From the video it looks like smoke is only coming from the top can which is linked to the front cylinders, And after that video only the front left exhaust had any warmth in it.
The spark plugs are pretty old, but i did inspect them and they all produce spark, which i would have thought would have at least let it start.

I have made a discovery, the mounting points on the coil for the rear coil are corroded to shit, if these serve as grounds to a coil then they have stuff all continuity. I will clean these and cross my fingers!

Edit, added: No such luck still, so frustrating. The haynes manuals wiring diagram isnt making sense to me either. http://imgur.com/HgHqg6G
It is saying that cylinder 1 has a long ignition lead to the side of the coil with the blue and yellow wire, and 3 has the short lead to the side with the black wire, where on the front, cylinder 2 goes to the blue and yellow wire, with a short ignition lead.. In reality all of these are opposite, and the bike sputters/ran poorly that one time in my above video. But when swapping wires around to match the diagram, it doesnt even sputter or anything!. (i did also notice the colours of the male spade plugs on the coil which do not match the haynes diagram)

Another edit: On the tyga website here : http://tyga-performance.com/stoner/fittingwiring3.jpg they show cylinder 1 with the short lead attached to the blue and yellow wire, and cyl3 with the long lead to the black wire, but isnt this geometrically impossible with the stock subframe coil mount??

[richyrd5]

how is the fuel tap/vaceum pipe?seems to me as its fuel related,as if its turning over for a while and then trying to start,,is it flooding at all??

[hunter]

As Ritchy said,Plus is the vacuum pipe in the correct position on the tap.

[MikeBb]

vac pipe is a length of 4mm vacuum hose purchased from a car supplies store, the tap works and you can hear it click over when you suck on the pipe. ill try shortening the length of it so that it is only as long as it needs to be.

thanks

[MikeBb]

ok

it was the plugs, and I'm an idiot.

I still think there's a miss in there somewhere so ill post another vid after some Burns on my hand mend up. . (non bike incident..)

Thanks all

[speedy231278]

Plugs can be funny. They can produce a spark, but the bike can still run like crap despite even idling fine if you wind the idle adjuster out far enough. Last year my plugs were ruined by the RAC bloke churning the bike over and over, and when I eventually got the thing to run, it idled by had literally about 2bhp.... new plugs, and it was fine.

The coils are earthed through the brackets, so make sure the frame mounting points, brackets and coil mounts are all nice and clean where the come into contact. Note that with the coils, one wire is the power coming in, and the other is the trigger to fire. Swapping them means that nothing will happen, as far as I am aware. It is not a case of one wire telling each cylinder to fire. The coil pack is not two units as such, each time one of the cylinders needs to fire, it fires along both HT leads. Yes, that means it fires every revolution despite there only being a charge to ignite on every other. It's called wasted spark, and confuses us all until someone explains it...

[richyrd5]

yes same as rd 350/500"s,spare/wasted spark is because its one coil supplying 2 cylinders,so it fires the other cylinder on its exhaust stroke.