Operation Awesome Bike!

[Ragingrob]

Oooh so where was everyone??

Me and Dushy were the only ones there till Andrew came at like 3. We removed all fairings and seat and front headlight bulb + casing. Checked sparkies, one is pretty dodgy with perhaps a bad thread, bike just give no power whatsover once the gear engages. When I left about 5, The carbs were off and in the process of being pulled apart. Heaps of the tubes and cases are worn and cracked which doesn't help...

Let us know if you guys got any further! It's already dark though.

[Squiggles]

I've been busy all day, and going out ta dinner shortly so no time to come round

Might get a chance to come by tomorrow and check it out

[klyong82]

They are meeting at Cock and Bull Newmarket as Dushi failed us all. By the way the bike blew up..........let Dushi explain.

So remember if you wanna meet them they are in Cock and Bull Newmarket bring your ID.

EDIT AGAIN: They going to the pool/bar/bowling place on the top floor of the wilson car park across the Cock and Bull.

[Ragingrob]

They are meeting at Cock and Bull Newmarket as Dushi failed us all. By the way the bike blew up..........let Dushi explain.

So remember if you wanna meet them they are in Cock and Bull Newmarket bring your ID.

The bike blew up?? You're kidding?!

BTW just checking did you find those fairing bolts at all or na?

[Squiggles]

By the way the bike blew up..........let Dushi explain.

Cant wait to hear this one...

[BANZAI]

Oooh so where was everyone??

I did! But only for little while in New Market...

Nice meeting to Dushy and Timati (Goro??) anyway!

So you didnt goto New Market? I didn't see you there...

[gijoe1313]

The bike blew up!? Interestink mein herrs, pleeze to be elaboratings!

[Ragingrob]

The bike blew up!? Interestink mein herrs, pleeze to be elaboratings!

Interestinko for sure! Either Dushy give us details! Or Kim can blab . I wanna know! Damn did I leave that cherry bomb in the fuel tank??

[ital916]

The bike didn't blow up lol kim is just being a rumour spreader, she runns but with no power, it's a carby problem. I have to head out tomorrow and buy rubber hosing and contact cleaner, maybe spark timing is off. Gonna need big guns on this one so yeah SOS to gijoe and squiggles and the such. Gonna be a real fun week :P oh im not working anymore tomorrow so feel free to com around from midday onwards!

[Squiggles]

Ill see what i can do, depends how much work i have at work, and how much study i get done @ uni, i've got some contact cleaner... tis fooken expensive shiat. Go get the rubber hosing from repco, they dont usually charge me coz im after so little of it

Is the petcock a vacuum one? (has a couple of lines at the tap, one of which goes to the top of the carb, the other one has fuel in it)

[motorbyclist]

all interested at having a look plz read this first:

ok, first of all the bike runs smooth as but produces NO power. seriously, i've ridden sick GNs with more grunt than that. my pocketrocket has more kick to it. not flooding, never misfires, just no power and slack response. there was water in the exhaust pipe (leaking from a rusted hole, must've just been condensation and a tad of rain). no smoke whatsoever, didn't bother to smell it. no kickstart so not much idea of compression

1st thing 1st check the plugs... seems rear one hasn't been done up tight and is just sitting in the thread. front plug clean, rear black but after installing properly it comes back to tan.... noticed that the rear plug thread was hard to locate the plug on and was diffucult to screw in near the end. suspect the thread in the head may be crossthreaded but couldn't see well enough to confirm.

next, check airfilter/petrol. looks good. quick look over carbies and apart from intake manifolds looking very sad indeed it wasn't too bad.

remove tank and airbox, start bike and rev it, looking inside carbies. the slide/diaphragm mechanism works fine, all is as it should be, but do notice the rear carby is spraying large fuel droplets everywhere, some were coming out the carby the wrong way. probably something up with the needle, but didn't seem that bad.... slight possibility of blowback from the inlet valve closing too late or not seating properly

remove carbies to investigate. at this point we noticed a few things:
electrical plugs, assumedly vacuum sensors to advance/retard the spark timing had very dirty and loose contacts. shall be cleaned before re-assembly.
the vacuum hoses and in particular a cover hose to block off an unused hole on the manifold was very badly perished and likely leaking. as such dushi is going to replace all the perished hoses (rather than just coating them in sealant
removed manifolds and examined. the inside seemed ok but the outside was perishing. covered in sealant incase there was a leak.
looked down the intake port on the cyclinder head and noticed that the metal was black for some reason, and had shiny bits. poked my finger in there (as you do) and found grit, unsure of origin, expect it to cause major headaches in the future if not already a problem. i doubt we introduced it removing the carbies bit it's entirely possible.


so, while it doesn't blow smoke and runs smoothly without any "bad" noises, it produced no power. likely to be from poor timing due to bad contacts, intake manifold leaks and possible compression loss from the vavles etc thanks to grit and dodgy spark plug thread

[Ixion]

I'd strongly suggest doing a compression test before embarkiong on anything else.

[motorbyclist]

Not sure if anyone is free this Sat but anyone keen to help me clean the carbs and replace piston rings on the Aprilia? Thinking might give it a go but an experienced pair of hands would be welcome.

....

was it a four stroke i'd be up in arms, but a two stroke is pretty easy to replace rings on. might pay to examine the cylinders/pistons for wear/tolerances if you aren't already replacing them (warning those parts are likely expensive)

just remember to drain the radiators before you begin, check the manual wherever possible and don't force anything unless it needs to be forced.... and do/undo bolts symmetrically about casings/covers to prevent warping/cracking

Ill see what i can do, depends how much work i have at work, and how much study i get done @ uni, i've got some contact cleaner... tis fooken expensive shiat. Go get the rubber hosing from repco, they dont usually charge me coz im after so little of it

Is the petcock a vacuum one? (has a couple of lines at the tap, one of which goes to the top of the carb, the other one has fuel in it)

i'll be in sometime after 3, depending on how my assignment is going...

yep it's the most retarded vacuum petcock system i've ever seen but suppose it does the job in a reasonably sesnible manner

[Ixion]

The black and black/yellow wires going to the carb are for a carb heater BTW. Those hoses around the carb and fuel tap are for the fuel pump.

[xwhatsit]

yep it's the most retarded vacuum petcock system i've ever seen but suppose it does the job in a reasonably sesnible manner

Throw it away and put a proper tap in. Save hassle in the long run.

Grit on the inlet tract sounds worrying. I can't work out wtf you guys are talking about, you seem to be mixing your terminology up all the time (at least Dushy lol), but what is the state of the intake manifold?

It seems silly to have a vacuum sensor in the carb controlling spark advance. I hear it's normally in the CDI, based on RPM (as the CDI knows what RPM of course), or old-style mechanical advance on the end of the flywheel. Having it based on carb vacuum would be ridiculous.

Get a manual, get a compression gauge, and somebody keep Dushy away from anything sharp.