Project GSX250 restoration

Ah fantastic, thanks guys! I have to look through the inspection hole, got it!

Got a carby-related question now... there's two vacuum hoses coming off the carb, one goes to the petcock, where does the other go? I didn't check where it was connected before it fell off the bike =/

 

Also petcock is kaput, it is leaking w/o vacuum.

 

Looking at parts like these: http://www.ebay.com.au/itm/KR-Fuel-...388278?hash=item233359f2f6:g:kEsAAOSwTglYmGak, only the diaphragm in my petcock has an o-ring. Am I missing an o-ring on the body-side of the petcock perhaps? Or is it just the the o-ring is worn? Holding the diaphragm in place still sees the petcock leak.

 

So the second carby hose is a breather hose, if I'm not mistaken...? Can anyone comment about how to fix the leaking petcock?

 

Yes, if I hold the petcock diaphragm in place, emulating what the spring does, which should prevent fuel flow, fuel still leaks through. This makes me think it's the o ring but it doesn't look worn or dry. There's only 1 o ring in my petcock, on the diaphragm plunger.

 

I'll just have to try the repair kit, don't think I'd be able to tell if it's been modified...

 

Yeah that GS550 petcock is almost identical to mine. I'm either having the same issue - four prongs hitting the diaphragm - or the plunger isn't quite right for the petcock. Trying grinding down the four prongs slowly at first because the o-ring looks fine, but no matter how hard I press on the plunger/diaphragm it still leaks.

 

Ok think I found my issue:



Missing a couple o-rings on the brass screw! Anyone know a part number or spec such that I buy replacements? Thanks guys.

 

Ah cool! Read past that originally as I dismissed the prime screw as being the culprit. Awesome, wasn't having any luck finding any myself.

Damn Lancashire Seal don't combine postage... fortunately found another eBay mob though.

 

Yeah eBay explicitly said this one doesn't... Anyway found another seller that isn't gonna charge me $20 for postage of $5 worth of items

 

Ok so checked the valve clearance today, all good except the left valve of the right cylinder intake, needed a bit more clearance.

10 links between indicators thank god!


Few questions though:

- Still oddly getting a lot of resistance manually turning the crankshaft when going through one of the four strokes - when the left hand cylinder cam lobes are down... am I measuring something wrong? I did L EX, R EX, L IN, R IN, starting with the crankshaft on position T (the side marked R| F| T|) and rotating 180 degrees each measurement.
- Also noticed my 'T' alignment notch doesn't 100% match with the cam notch positions being at 90 degrees, don't know if this is causing the above or not. Ie. instead of the alignment being on the bar next to the engraved T, I'm aligned on the T itself.
- Is this wear on the cam lobes something that I need to deal with? Cheers guys.


Now just waiting on a battery! Can't wait!

 

Thanks Johnny, yeah the 1 and cam notches aren't quite horizontal when the mark next to the T is aligned with the indicator. Could that mean I need to adjust the position of the cams by a link or two? Am I correct in thinking this is inferring that the cam timing is advanced or delayed somewhat? Complete novice at this stuff! I'll take a better picture tonight for reference.

Have to double-check tonight but I'm guessing the resistance is just compression (plugs back in)... that I'm not getting it on both cylinders is concerning. Will have to diagnose with plugs out again too.