Project Yamaha SRX 250 3WP

Its certainly not that money is tight... I would prefer to do as much as I can on it so I will probably try some Chrome Paint and then plenty of clear to give it depth.. By using 2 Pak clear I wont have to polish it out...
But any other suggestions will be considered.. it wont happen any time soon so plenty of time to consider the alternatives.

 

You could be on the mark there Murdo... when I zoom in as much as possible it appears the threaded brackets on the frame have similar colour which wouldnt be the case if it was chrome plated I would imagine.
I still think I will investigate some chrome paint. I just like the way it goes with the Ruby Red and the polished engine covers etc... if it doesnt work out the way I want... I will just strip it off and repaint the frame

 

So.. time for some updates
I have almost finished the modifications to the frame to bring it up to the 3WP spec which includes different rear-sets to accomodate the rear disc master cylinder and pillion foot-pegs, rear master cylinder bracket and removal of old pillion brackets etc. Hopefully all that will be finished this weekend and I will try out my kArcher wet sand blast attachment.. should be interesting.
I have the seal kit for the FZR front forks so I can also start on them. With the weather starting to ease off I will be able to get into the garage of an evening and some of these things that dont require making a lot of noise...
I have also decided that it is going to be converted into an SRX350... This is a reasonably straight forward process (not easy, just straight forward) that requires the engine cases having the hole for the barrel to be machined out another 12mm..
The stroke of the 250 and TT350 are identical as are the little end bearing and conrod for that matter. So, I have purchased a 2nd hand (needs boring) TT350 barrel, I had a 350 head (needs a good clean and valve job) and I ordered a TT350 carby as well as a Keyster repair kit this morning... The SRX250 runs a 22mm carby where the TT350 is a 24mm. Others have in the past stuffed around with re-jetting the SRX carby but I prefer the TT350 carby and that way I can use standard known jetting, less hassles.
My 3WP tank has arrived in Melbourne and should be shipped to me this week so I can then start on dent repairs and getting it ready for paint...
Speaking of paint... I had planned on using the Ford "Ruby Red" on it but I have seen some examples of the DNA Custom Paints range and I will try that I think.. It is a more technical process but in the end I think it will be better...
The colour I am going to use is called "Spilt Blood".. Maybe not a good omen for a bike but the colour is pretty schmick...
So.. more to come on the little SRX in the coming days and weeks... next time I will add Pictures

 

Yep.. Ihave been over the DNA site a lot once I spotted it... there is a Valiant in their Youtube vids that was sprayed in Spilt Blood but over black... which has given it an entirely different look. More along what I am after.

 

Yep.. Darren is the one who will do the machining on the cases There was a very detailed thread in Perth Street Bikes I think about the build.. he had a lot of issues as he had to use the 350 crank ( the 250 was seized and they are very hard to find ) as well and it is longer than the 250.
He also used the FZR swing arm which has its own set of problems with chain sliders etc..

 

So I decided to pull down my original motor that had been rebuilt so it can be converted to a 350. This will leave the matching numbers engine as stock... It is an easy strip down until you come to the flywheel. If you search for SRX250 flywheel puller you get these units that screw in via a large thread and then the bolt down the middle pushes and off it comes.. only one small problem. My SRX250 doesnt have the large internal or external thread... mine needs a plate type puller, which I had but it stripped the thread out of the plate. So now I need to go off to Bunnings and find an M10 long bolt and nut to try and get it to work... pictures of the flywheel are below.

This shows the 350 barrel sitting on the cases.. there will be minimal gasket area in 1 spot.. but some Yamabond should sort that.



This shows the difference between the 250 barrel and the 350 barrel... about 13mm difference



The Cylinder head is different in that the combustion chamber size is larger... valves are exactly the same as are the cams



Closer pic of the 250 head.. this one has been reconditioned.. valves re-cut and lapped and clearances set... so I dont really want to strip it to fix the 350 head.



This is the 350 head.. I originally pinched the 2 inlet valves for the 250 head... I might try to find new valves this time.



This is a shot of the flywheel... as can be seen.. there is no M27 or M24 external or internal thread... so it is definitely a plate style puller needed.




This is just a shot from further back

 

The holes are threaded and it is yes to the bolt. The thread on the puller is super fine and the load has just peeled it out of the casting. I will go and get myself an M10 or M12 bolt and nut which should solve the issue tomorrow. I hope.
I was going to have a look in the service manual to see what the special tool section showed for the flywheel puller but was distracted by the V8’s from Perth.


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