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Discussion in 'Suzuki 250cc In-line 4's' started by JohnRcbr, Aug 6, 2018.
Above looks fine, check 16 pins mark 1 to mark 2 (intake cam /exhaust cam)
Thanks Simon. Yes sixteen pins between arrows. It didn't run so I have it all apart again to try and figure it out. Also waiting for another set of gaskets and rings.
I was going to write a lengthy reply but I wrote this instead. https://2fiftycc.com/index.php?threads/camshaft-timing.10528/
Thanks for the link. Correct me if I am wrong but a look at the coils indicates that the plugs fire slightly before TDC on every stroke so the deciding factor on which cylinder is on compression and which one is on exhaust is how you install the cam shafts.
The correct procedure will be in the service manual. Every bike and ever manufacturer have their own methods. Some use marks that align with the crank case split. Some have a dedicated timing mark elsewhere.
As for camshafts, sometimes there are dots on cam caps that align with dots on the cams, sometimes the cam sprockets have lines that align with the mating surface of the cam cover, and so on.
If you have a look at the pickup/stator area you should find a timing mark. On the camshafts or sprockets there should also be marks. Generally speaking, when the crankshaft marks are aligned, and the camshaft marks are aligned, and the cam lobes look to be not opening, your are on TDC, compression stroke, for #1 piston.
I followed the instructions in the Across manual because I cannot read Japanese.
Yes, in the case of your engine there is nothing to distinguish TDC compression other than the position of the camshafts. I wrote the post to be generic, which is why it is not in this thread, and I am trying to highlight the importance of understanding what one is doing not just blindly following some instructions. It is not directed at you specifically.
My rings showed up yesterday(Friday) afternoon so I spent the evening assembling the engine. Today it was installed in the frame and I fired it up. Let it reach operating temperature and checked for leaks. It sounds good and everything looks OK.
Next week I will finish getting it ready to go back on the road and take it for a ride. So far so good.
Hi guys, question for Simon ( i tried looking to see if i can PM him directly), are their new / copy body panels available for the GSCX -SP and decals too??. I cant see to find any chinese copies on the web.
It has been along time but I thought I would update you on the outcome. The bike ran fine after assembly and was much more responsive. I believe the stock jetting is still a bit rich but left it alone. I did three highway rides in June, one 100 km, one 200 km and one just over 300 km. For the roads I ride this bike could use one more tooth on the front and my old legs are to cramped on longer rides. I never addressed these issues. At the end of June I crossed paths with I gentleman who really liked my bike but needed to sell his first. Turned out he had a low mileage 2007 Moto Guzzi 750 Breva. I have wanted a Guzzi for close to 40 years so in the First week of July we ended up trading. It took about five minutes to regret seeing the GSXR leave but now I can remove a Moto Guzzi and a 250 four cylinder JDM from my want to own list. I have more bikes on my wish list than I will be able to acquire in my lifetime and a few are 250's so I will stick around.