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Discussion in 'The Pub' started by kiffsta, Nov 3, 2013.
More work done today and @kiffsta came over and helped work some magic
not long to go now
Gasket material removal. Paper gasket removal seems to be one of the most painful part of this process.
I think threebond make a gasket remover, but don't get it on you, and you might need to apply half a dozen times and leave overnight in a plastic bag. When it does is thing, the gasket lifts right off. NBC 110 cylinder base gaskets get baked on pretty hard...
I use this stuff , works a treat
Wheels and calipers on. Brakes bled. Engine getting delivered tomorrow
Been playing with an old ZXR250A engine to test some tuning suggestions like increasing the compression ratio of the engine. This engine is number 480, so a very early build that I assumed was high mileage and might be good for parts at some stage.
Went to turn it by hand and it was pretty tight, so rather than push it, I dropped the oil (smell was nauseating) and started pulling covers off to see what was what. Clutch was stuck together, so it came out in one piece. Bottom end was mucky to say the least.
Once the clutch pack came out the engine turned freely, so I did a quick check of the valve clearances and most were okay, but a few were either way over or way under. Looks like someone put 1.75mm shims in all the valves except a couple. Pulled the head off to practice doing a squish test. Turned the head upside down and put fuel in the valve area to check for leakage. They all leaked from either inlet, outlet or both! So, valves will need to come out if I want to use this head. Cylinder one has some liquid marks (looks like fuel) which should hone out. Cylinder two was more burnt oil than I've seen in a while, so not expecting rings to be worth keeping.
Did the squish test, but I am waiting for feedback about whether it was done properly or not.
Cleaned up the clutch friction and steel plates. Checked plates were within spec and also springs. All good, so ready for reassembly. Cleaned up sump, oil pickup and pressure relief valve, so bottom end is also ready for reassembly. Need to get some new gaskets before final assembly (depending on how good the top end is).
Did several more squish tests on the old ZXR250 engine. Turns out I was measuring the wrong area.
I was measuring the valve recess when I should have been measuring the flat areas (der).
Doesn't look like there's much room to move in the standard combustion chamber, so I might leave the whole increase compression ratio exercise for a later stage. Need a few different shims to finish the valve clearances, so in the meantime I will store the shims and buckets externally...
And, put the reassembled engine to one side and start on some carbs for another project.
Got the MC19 up in the air to pull the wheels and forks for rebuilding and paint.
Tomorrow the rear shock comes out to see if I can figure out a better option than stock.
Swingarm is pretty disgusting so I might pull that as well and give it a good cleaning.
I have acquired another mc22 that has done a head gasket , thinking I should save this one
Thanks for the dirty wheel club vote,‘I should just be made the president of that group
I belong there too, don't feel too bad
I believe the zxr is already at about 12.5:1. Not much room for adjustment
Smart boy making use of speshiality tooling ekuipmint.
Initially I used 4 inch nails but they kept bending (the steel holder slides down after the DIY castle nut driver is on) so I had to use drill bits
Well, that escalated quickly
Best to use a rattle gun so you don't break the thread towers in the hub. There is another speciality tool for holding the hub, you could make a basic one, but rattle gun in gear works
The stanchions look black, DLC?
Went and did a spot of shopping
Thanks @James Mclaren to helping me
Pick up 22 bikes
Lucky Mr Policeman didn't pull you over as your passenger isn't wearing a set belt .
What is the bike on the front seat, Kiff? That chamber looks like it would suit one of my projects.