Pinned So what have you done to your bike today?

I have 4 bikes going at once in the shed: Ninja 650, KDX200 and 2 zxr250. The 650 is just a major service, fork seals and steering bearings. I was testing a zxr engine, tried working carbies on it, no go. Checked the the spark and found only one coil firing, until after stop cranking and it would fire 2-3sec afterwards. 3 igniters, same result. So I looked at the pick up coil and found it had been replaced (different colour wires with joins) - the resistance was on the limit, too. So, do a compression test to see if it is worth continuing. Fitting a tester was problematic. But when I finally sorted it, cylinder 1 got about 90psi, cylinder 2 got about 60psi. No point going any further, parts motor (probably valves leaking, there was water in the intake. The other zxr is the carby donor that needed the carbies sorting because it was running amiss and drinking too much fuel.

The kdx was running, but I thought I'd spoil it new rings. Just as well I didn't rid it Sunday, one ring is worn to only 1mm deep; it had a 5mm ring gap!! It could have caught a port and wreck the bore, too. But the bore has pitting and watermarks - a hone might do that. But then the problems grow. Sure, the bearings were shot in the crank, and the kickstarter wasn't always engaging. But when I took the clutch out I found more troubles, like a gearbox locking up after 2 turns and the bits of what looks like clutch plate that come out of the gearbox. Time for a full rebuild. :-(

 

Nothing today but I did get a call from my Machinist to say my crankcases are finished for the 350 conversion as well as the SRX6 triple tree conversion and the clutch cover having some plugs made up to fill the kick start and decompression lever holes.. I cant pick them up until Tuesday though so I am not sure I will get much more done before getting my knee replaced... still it is progress on the little SRX

 

Hi Andy, no problem buddy i'll drop in and pick the cases up for you, no need to thank me !.Where did you say the top end was in your shed ?.

 

Unfortunately the barrel still needs boring and the head is waiting for the hot factory cams and a bit of refurbishment.. apart from that.. the gate is locked as is the garage
Plus I know you cant make the long drive to Sydney

 

According to the EMS Tracking site my bits from Japan have arrived into Sydney. Not that I am expecting to see them this week but it looks like a few things are starting to fall into place

Included in this little package are my 30X cams, SRX600 Headlight and headlight bucket plus an SRX600 lock set which is ignition, fuel cap, seat and helmet lock.
I think the only one I will need to fix is the fuel cap. Only to take out the lock barrel from the one coming in to the new (almost new anyway) fuel cap I got with the tank.



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Well... my shipment from Japan arrived a short while ago.. I quickly opened it up and did a quick measurement on the cam lobes and yep... they definitely have a little more lift than the 48Y spec cams I have from the old engine and the TT350 head..
I will unravel it all later and take some pics to go in my build thread... at last some things are going right for us..

 

Just by accident...of course lol

 

I’ve changed the reg/rec on the ZXR, the reading on the battery was way below 13v, and the voltage off the alternator was a healthy 25v @4000rpm so I guessed the thing in the middle was the issue.


Worked ok for 5 minutes...

Absolutely no effin’ clue what’s going on, but it would rev up happily beyond the 14k on 1st gear off a traffic light and then in 2nd wouldn’t even drag itself up to 10k. Then almost stall, then idle it for a while and it would work ok for a second....

 

Does it rev cleanly in neutral and not moving?

If the carbs are not at airbox pressure, you will experience bogging and loss of power the higher your speed.

Check the air lines from the fresh air valve to the airbox, and from the air valve to the carbs.

 

At times. If I leave it idling for a while and then open throttle it will, but just once. A couple of minutes more and back again all good. It’s friggin weird, I cannot point at anything right now. Just took the airbox out to check if everything is well connected and at place.

It’s driving me nuts!

 

Mm ok. Would choke help with that? Now it won’t even idle, throttle just stalls it and the only way to rev it up is choking it.

 

Will do. Thanks Murdo!!

 

I have been searching tonight for sprockets to suit the SRX and I am drawing blanks all round.. Standard on the SRX250 3WP is 428 chain and 17 / 50 sprockets... the original SRX250 51Y had 14/43 with 520 chain...
Problem I have is that I am using the FZR25 3LN1 wheels so I need an FZR250 rear sprocket for 520 chain with either 44 or 46 teeth and the original SRX sprocket wont fit the drive hub on the FZR wheel.
Depending on the final drive ratio I want as they are slightly different between the 3WP and the earlier 51Y. I would prefer to go to the taller gearing especially with the 350 engine in it as it will have plenty of go off the line and will easily pull higher gearing.
None of the rear FZR sprockets I could find were low enough on the teeth to suit and it was hard finding them to suit 520 chain...
I can get a really good 3WP sprocket from Japan (used) but nobody goes a 17T 428 front sprocket for the SRXs50 engine..
Its doing my head in right now...