Got an MC22 engine in at work (yay 250 nostalgia), customer races them and had a mechanical over-rev and it dropped valves, he bought a spare engine with a good bottom end and made a good top end and threw it together. Brought it to us for clearances and some thread repairs as he just chucked whatever shims he had in wherever. As usual start running out of 185, 180, 175 shims as they seem to be the most used sizes. #4 inlet valves had huge clearance, as in, visibly it looked like at least 5mm. I put the biggest shims I had in there and the clearances didn't change. Pulled the rags out of the ports that the customer put in there, #4 inlet valves are more bent than most politicians. One of the thread repairs is easy enough (cam cover bolts, 6x1 helicoil will fix it) but the other is for the idler gears between cams and crank. That assembly looks to be bolted down with the head bolts, so if one of those is gone it's a thread repair in the block. It'd have to come apart anyway to sort out the valves and do the thread repair on the block. But the Honda's don't have a removable cylinder block, the pots are part of the top crankcase like most modern bikes. Just waiting to see what he wants to do with it.
I cracked 70 today ... thats years not Ks ..... so I went out on the beast to celebrate , with all my mates ..... the conversation was a bit slow but thats old farts for you
@GreyImport Congrats on making it to 7 decades and still have your bum on a bike. Hope I can do the same.
Got my brothers old RT100 going yesterday, and fanged around the yard on it. Chucked the daughter on the seat with me a putted around slowly, now I think she (3) wants a PW50. Sounds good to me!
Slung the radial master around in the back of the truck a few more times. really need to get that into the garage and cleaned out so I can test in on the zx4r. Life is still in the way of my riding/wrenching so not much happening other than keeping batteries charged and occasionally warming up the ones that run in the garage
Rainy day in Melbourne today, so spent the day in the workshop doing maintenance work on the ZX2R. I replaced the standard rear brake/master cylinder setup with an all-in-one unit. Recessed it as much as possible, but it sticks out a bit too much for my liking. I couldn't mount it how I wanted to as the brake fluid reservoir impedes the banjo bolt. I had to mount it at 90 degrees by using a bracket. It works fine, but I will see how it feels when I ride it next. Playing with carbs today as someone mentioned shortening the inlet trumpets, so I wanted to see what would be involved to do that. I will sacrifice an airbox to do some playing, but before I start hacking into a perfectly good airbox, can someone remind me of the benefits of running shorter inlets for a 'wide open throttle' application like drag racing? I can only assume it brings the 'compressed' air into the chamber quicker due to a shorter runner?
Resonator, in our case, is the airbox. http://www.planetsoarer.com/resonator/ResonatorsAcoustic.htm Sort of makes one want to fool about with a variable volume airbox. Just need your own "home dyno" first. Mmm, maybe one could use the factory numbers for peak torque, measure the volume of stock airbox etc and derive the missing variables from that. Then use those values to calc the optimum volume numbers at different rpm. Design a diaphragm wot lives in the airbox and Robert is your father's brother, or buy a dyno.
That page is reminiscent of the boost bottle https://motocrossactionmag.com/forgotten-motocross-tech-the-boost-bottle-craze/ The FZR's with the EXUP already have an RPM dependent servo motor, that could have another drive wheel and cable attached to it to manipulate something in the airbox
Working on a YZF-750SP at work today. A whole bunch of custom work was done to it here 3 years ago before I started, to fit some marchesini wheels and a Yamaha factory racing swingarm. It has a nice set of Keihin FCR's on it. Unfortunately it looks like it has sat outside ever since, the fuel is rotten and the tank has had a previous repair on the bottom which is now leaking. Here's what it looked like at the time it was done
Nice machine .... should go like the clappers when its had a once over BTW theres a dead sheep on your seat
White absorbent material wouldnt be my first choice for a seat coveron a bike like that.... might end up with a GT stripe depending on your skill or lack of May be why some of these "Cafe / Street Racers" use Brown seats
Messed with the radial master cylinder for a bit. Noticed it's missing a part. Buddy has it, but its a 2hr slog away comfort on the new whip shall come soon, but not soon enough.
I got the 750 running with some fresh fuel on remote reservoir and a set of plugs. The old plugs were wet, black and finger tight. She's running rich as with black smoke and after fires out the exhaust. The flat slides are noisy as hell with the airbox removed. Got to see what the customer wants to do with it now
Booked the Triumph in for a Blue Slip next Thursday….changing to NSW rego. The place I booked it in does Royal Enfields so they are giving me a Loaner for a few hours. Be interesting to see what I get lol