Pinned So what have you done to your bike today?

I got one of these for a CBR250R, fast delivery and worked a treat. Not sure if the 300 uses the same pump.

 

Stripped the race bike down to bare bones.



Giving the engine some TLC by checking the valve clearances; cleaning out the cooling system; Checking the thermostat works; rebuilding the starter motor (notchy and tight); sorting out the electrics (help from @jmw76).

Valve clearances done and everything is back together. Took the opportunity to replace some o-rings and few other bits while i had the cams out.

Work on the electrics is ongoing...



Rebuilt the starter motor and it's back in the engine.

 

Hi to all .
Have been scoring some N.O.S part's lately , nothing to exciting , but i thought found some N.O.S secondary main jet's for the SRX 250 , part number 30X-14343-40.
But , what arrived was a different jet altogether , the jet's look like part number 288-14343-59 , which suit's the principal carby.
Well , the shape / style is correct , but usure of the bore , as i haven't a carby drill bit set to measure them , that's another tool i'd love to get.
So these jet's where incorrectly stamped back in the 80's i assume , they've been floating around on a dealer's shelves wrong all this time.
Look's like someone had been drinking to much Sake while processing these part's and not recognized that the part number was wrong for these jet's.
Have made contact with the seller , he's a good guy to deal with and it's not his fault at all, he'll get back to me on Monday.
The jet i was after is on the right , the jet's supplied are on the left.
Have taken a picture , well , we all love picture's don't we .



Since i'm still talking about finding new part's , i scored a N.O.S Battery positive lead pretty cheap , part number 51Y-82115-00.
Fitted the part this morning , here's me thinking this will be a easy fast job , un-bolt old part and bolt in new part , nope .
The factory set angles on the positive lead terminal did my head in , what i thought how it would install , was nothing like i had to install it.
If any SRX 250 owner's would like to chime in and show a picture of how there positive lead's (if it's an O.E part ) bolt's in , that would be much appreciated , it simply look's wrong to me , BUT .
Here's a picture of how it ended up being fitted , it's not the way i'd usually install a main positive lead .
Yes i know , the bike need's a clean .

 

Ongoing work on the race bike. One of the front forks was weeping, so I figured I might as well pull the forks out and just check for muck. Those seals were changed during Covid, but the bike never goes out in the rain or dusty conditions, so I'm hoping it's just some dust/dirt causing the weeping. The fork oil that came out was like new, so fingers crossed.

 

I've been jumping between jobs as the weather dictates. I decided to pull the USD forks completely apart and make sure everything is nice and clean and looks to be working properly. Upside Down forks are a huge pain in the a*se for what I'm doing (drag racing), but they are well worth it on the salt, so I'm getting familiar with their workings before I head back to the salt in the next year or two. The rear shock on the ZXR250 is absolute rubbish in so far as it cannot be rebuilt without cutting it open and a whole bunch of stuff that is WAY outside of my pay grade. I even sent one to Keo Watson for him to confirm what can and can't be done with it. Keo is well known in roundy racing and is an expert on rebuilding and tuning CBR250 shocks. Keo confirmed that the ZXR250A rear shock is not rebuildable, so I guess I'll need to pony up for one of those YSS after-market shocks in the near future. Keo is looking for a replacement for me, but he wasn't too confident the last time we spoke.

I would definitely prefer to has conventional forks on the drag bike and I'd love to get my hands on a complete ZZR250 front end to see what's involved in swapping the USD forks out for RWD fork/triple-tree & wheel. The whole front end of ZXR250 weighs a ton and the ZZR250 single brake rotor setup is also perfect for drag racing.

Anyhow, the USD forks seemed clean until I pulled them completely apart; wow, how much rubbish/gunk is hidden in these valves and cartridges. it doesn't seem to take too much to clog some of these tiny orifices and change the behaviour of your shock regardless of what rebound or other settings you've selected.



All cleaned up and ready for reassembly.


I'm glad I did this level of clean as it will be my new standard for 'servicing' USD forks. I also took the time to do a @Linkin inspired 600grit clean up of the fork tubes and I will do a Dave Moss recommended rebuild. I went for a ride yesterday and noticed the front RWD forks on my NT400 were literally spewing out fork oil, so new seals ordered and another fork rebuild coming up in the near future. The ride was to the Venus Bay area of Victoria and I only noticed the fork leak half way there. I think by the time I got home there wasn't any fluid left in the forks; most of it was all over my bike!

 

Fork oil was basically like new, which is why I was so surprised to find so much muck and black gunk inside the dampening cartridge and the valves. One of these forks was weeping which is why I pulled the forks off in the first place.



The seals were fine, just a bit of dirt causing the leak. I could have got away with using a Seal Mate while the forks were on the bike. https://www.mxstore.com.au/p/Motion-Pro-Seal-Mate-Fork-Seal-Cleaner-Single/08-080395

I had new seals, but I didn't need them. The ones in there went in during Covid, but the bike only runs down a drag strip so not much compression or hard work for the forks to deal with. From now on I'll be doing a full strip down and clean whenever I have to do USD forks.

 

Today was the one sunny day we’re expecting for the next while. Been cold and miserable for months, hit about 21 today- so I decided to ride to my Kawi dealer since Megazip said carb parts I needed were in a US warehouse. They were not, but I put 25-30 miles on my ZX4RR today, before coming home and ordering parts for everything it seems… the air Ts for my carburetors and a pull cable on the ZXR, a new clutch slave for the Monster (now a fuellie 900, not flatslide 750), an intake manifold for my Dodge Neon in preparation for a Haltech standalone and throttle by wire… just spent all the stupid money today. Oof. But hey, got a ride in!

Busted carbs, not busted bike.