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Paint stripper isn’t what it used to be.ZRX61 wrote: Sat Aug 15, 2020 4:44 pm Surprised no one mentioned paint stripper. Dissolves the carbon & you can wipe if off with a rag.
5 thou is a minimum. 6 thou is ideal. 7 thou will do.Mr. Dazzle wrote: Sat Aug 15, 2020 4:00 pm Well the aforementioned videos certainly have the air of expertise IMO, he gives off the vibe of someone who knows what he's on about...but YMMV.
I will take the cylinders and pistons to work and measure 'em properly to see what size they actually are. The recommended clearances I've seen from various sources are 4-5 thou, but as high as 6 on racing engines. I shall see what I've actually got.
Ardrox will work, there's also Carbon Off which is sold for use in restaurant trade for cleaning the carbon off pots & pans etc. Oddly enough, it smells EXACTLY like the *good* paint stripper.
Where can Mr Dazzle buy that?ZRX61 wrote: Sat Aug 15, 2020 9:46 pm
Ardrox will work, there's also Carbon Off which is sold for use in restaurant trade for cleaning the carbon off pots & pans etc. Oddly enough, it smells EXACTLY like the *good* paint stripper.
The fact they banned it in Califailure indicates that it does indeed work.
That's because it's basically paint stripper...Julian_Boolean wrote: Mon Aug 17, 2020 12:03 pm You can get a spray to do it, it works but it also takes paint off like you wouldn't believe
I think I ended up doing my Kawasaki ones by soaking them in WD40 and then using wet and dry paper
You can snip a flat side into a copper washer and hold it in a Mole grip.Julian_Boolean wrote: Mon Aug 17, 2020 4:55 pm You can buy hard plastic scrapers designed for the job, I think mine were about £10 from Amazon
Isn't it a 'wasted spark' ignition system wcith a single contact breaker firing one plug on compression while the other sparks at the same time on the exhaust stroke and, therefore, no bang from that pot?.Mr. Dazzle wrote: Fri Aug 14, 2020 8:53 pm They're 360 degrees apart, so one fires while the other is on the intake. That's "the norm" for parallel twins AFAIK - so you're basic CB250, CB500 etc. will be the same I think. Twins that are 180/540 degrees apart rock side to side loads. Modern stuff with 270 degree cranks etc. tend to have balance shafts.
I think the original "big bang" engines were Brit twins re-cammed to fire two at the same time, but don't quote me. This bike sparks both cylinders every time and has completely separate carbs and exhaust for each cylinder, so it'd be a pretty easy mod. Literally just change the cam I think.
Nutters who altered Triumph twins to fire both cylinders at once, sometimes for a traction advantage in trials, just removed one inlet pushrod and one exhaust pushrod and welded the rockers together. Ignition needed two coils in series, or a Honda-type dual output coil.Mr. Dazzle wrote: Fri Aug 14, 2020 8:53 pm
I think the original "big bang" engines were Brit twins re-cammed to fire two at the same time, but don't quote me. This bike sparks both cylinders every time and has completely separate carbs and exhaust for each cylinder, so it'd be a pretty easy mod. Literally just change the cam I think.
And you are seriously considering putting it together like that?Mr. Dazzle wrote: Fri Aug 14, 2020 11:19 pm Compression was a bit low before I started taking it apart....about 100psi on one side and nowt on the other. That "nowt" is why I started taking it apart!