Stu's Fizzer

Anyone had a similar problem to this?



And how they resolved it? I've looked at ebay and browsed around a bit but not much coming up, FZR250.com has a decal sheet but I wouldn't even know where to start trying to source some...

 

Sooo..... having now received most of my bits I started digging into the carbies. I found a few things, a lot of potential risk but overall I was pretty happy with how clean they were. A bike this old could have been a lot worse.

This is the EXACT reason to never use that gasket goop stuff. Not only is it damn near impossible to clean off, but the risk of contamination is very high:



The other thing I found is some minor degradation of the vacuum plungers. Although the plungers themselves looked OK, over the years it has obviously started to shed some powdery bits of the rubber. Another contamination risk, those jet holes etc are so small - the bike isn't going to like it if some of this gets clogged up somewhere. I carefully cleaned the plungers carefully with a rag and some WD40 as I didn't want to risk stretching, ripping or doing anything that may compromise their correct operation. They polished up pretty well.



Other notable points are that all the jets were clear, but the slide housing seals and the main jet seals were the most cactus. I couldn't even get the main jet seals out in one piece. This gives an idea of what I was looking at:



Tip: Label and keep EVERYTHING. Not only did this help me to put it back together (knowing what I had/had not done in each carby), but if I ever needed to revert back I could at any time (except for the main jet seals haha).

Lastly came the spit 'n shine with the carby cleaner:



On the side, I also got the venhill EXUP repair kit. Good kit for $20, very easy to use I'll throw it back on the bike today. The biggest plus is NO SOLDERING REQUIRED which I like, not because I can't do it but because tightening with an allen key is much less effort and much more easily adjustable



As I buggered the chain clip I'm getting another one in from Slipstream (did you know that chain manufacturers purposely make their chain clips different? what a royal pain in the bum, especially since I got an RK chain and nobody in melbs seems to have it on the shelf!! Annoying!). Also the extra lock washer for the front sprocket is in, looking to whiz into the CBD and grab it in the next few days sometime.

 

Ok so... Had no problems getting it tight with the second washer. Pretty neat outcome I think. Still to bend the corners up.



Could someone with a 3LN3 or similar please humor me with a picture of how your cables are attached to the EXUP actuator? The exploded diagram seems to show the casing the same, but my casings are slightly different. Just wanted to double check which was which, if it matters.

 

hey @GreyImport @maelstrom just sense checking @Mclaren 's thoughts. pilot screws two full turns out to start with?

 

Thanks mate I'll be sure to do that. These carbies aren't the easiest to access, I can see adjustment being relatively... painful.

 

Well guys, today a mate and I got her going again today and she runs pretty damn good. EXUP is back on and all sweet, and we seemed to fix the clip on the chain and tightened the rear wheel. Carbies, airbox and tank went back on and she was primed to go.

The pilot screw settings seemed to work out OK, she didn't idle at all first, but we played with the idle screw on the side of the carby and got her to a pretty good position. In the first video you can just hear she is a little jumpy still, so for some fine tuning we may play with the pilot screws a little more - but for the most part she's really smooth. We discovered that one fork seal is also leaking (although minor) will get onto that as well.

At idle:


First run:


Getting pretty excited - almost there!!

 

Well, got an unreg permit to take her for fresh fuel/tyre pressure check and... wow. Not only does she "go like stink" (as someone else so elegantly put it lol) but boy does she flood. She hates sitting still then trying to take off any less than 3-5K rpm.

When she's going she's going great, but you have to keep her revving and burning off that fuel because I was finding it quite tricky to keep her at idle without flooding her. Suppose that's my welcome to the "fizzer club".

First job tomorrow - lean up all the carbs one notch. Hopefully makes it a bit easier.

Front brakes need a bleed and the fork seals are coming so a couple more weekends of work to go.

 

Hmm, so is it 2, 2.5 or 3 turns out? for pilot screws. Ive heard all three options...