Will I get my 100 ready in time for Taupo?

[Buckets4Me]

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Well last night I watched telly & tonight I'm goin' the pub. Can I bet some money against me?

But I did lie awake last night thinking about adapting the exhaust manifold. To save time I'm going to run the RS pipe, but I have a pipe design (actually two) to build at a later date. I have a plan to seal the water jacket leaks & thus start the engine & test the water pump.

You should start a thread about finishing the rs100
and see what help is offered
also you need to take lots of pics and put up a few posts on how it's going

then let us talk smack about it and how it wont work

be good to see you there agin this year on a good reliable bike

[F5 Dave]

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. . . The design I had in my mind was quite good despite being some time ago when I was a sight more clueless. Water cooled with an NSR250 pump driven in the correct direction at the right speed (so often screwed up). . .

so I'm just thinking about the water flow, hmm, should go in here & out there. Best I whip the cover off & have a look. Yeah ok, quick google impellers to see it is right. Chap who was helping me at the time knew all about this stuff & how it had to be driven so I took his advice.

Last check - put in gear & spin rear wheel. - you Moron Martin, it's turning backwards. [sigh] this bike is such a fuckup. Oh well onwards, pump will still work just not very well, I can change it later. Sort of knocks the wind out of your sails.

[Sketchy_Racer]

Is there any reason you can't do a thermo-syphon on it? Or do a Simon trick and run a electric water pump.

[k14]

Just run an electric one. Just need a small 12v battery and it will run for ages. Easiest way to do it surely?

[Kickaha]

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Just run an electric one. Just need a small 12v battery and it will run for ages. Easiest way to do it surely?

Davies Craig electric pump with thermo switch, pm Diesel Pig thats how he did the one he built, they tried thermosyphon but couldn't get it to work properly

[F5 Dave]

Thermosyphon will work okish but you need to have the rad up higher than the engine & the RS one isn't. I bought the right pump for my MB50 in about 1989 but I ended up Thermosyphoning it (successfully) & never got around to fitting it so I sold it to someone else who never got around to it either. Wonder if he still has it?

The problem was the assumption that the pump was run off the clutch gear & not the crank I think, that sidecover hasn't been off in best part of a decade, but a bearing boss was remachined offset so it could. I ironically the easiest place would have been with the std kickstart gears. I found some last night so will have a looksee, would have to strip cases down to remachine so I think I'll run it as is & wait till I need to pull it down or as time permits.

I best have a look at an NSR parts diagram. Ahh thank you NSRworld. Yup as I expected the wp is driven by a large 23t primary so it turns anticlockwise, whereas the clutch reverses it & will make it spin real fast. Why do I listen to people?

Must learn to be more arrogant in the future. Hold on! - compared to then it IS the future.

[gav]

I think a Honda Lead 125 scooter has a water pump driven by a cogged belt? We were looking at using one for a water cooled reverse cylinder TS100, we worked on for a while. Well, until it blew up and we moved onto something else

[Skunk]

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Must learn to be more arrogant in the future. Hold on! - compared to then it IS the future.

It's working then...

[F5 Dave]

A friend's GP100 was watercooled with a Honda Lead (Lead? sounds like a heavy metal) pump quite successfully. I've also remembered on the MB that the idler gear for the kick is driven off the back clutch gear. Either way it won't be super hard to change it, but it can wait until I get the rest sorted out.

[F5 Dave]

Well I took the day off today to work on the bike. I've made a mid mount for the pipe & carved off the ex manifold so I just have to weld on the new one that I am getting cut out at the local eng shop. I've routed the water pipes after a bit of grinding space for the rear inlet.

I'll fill the pipes & start the bike & see how it spurts out water, then I'll know if it is enough to be getting on with. That exposed pipe connects to the btm of the rad & the top one is pointing up open for the test.

I smeared a couple more rivets a little over on the flywheel with the ball peen hammer but decided that wasn't helping my shoulder heal. Pity as that is the last thing to do before I can start it for a test run. Chain is all lined up. OK need to fit the carb, but it's been there before. Extended the rad mounts.

Tank & seat will slide on in 5 min so no drama there.

But this is just the test stage, I also need to fix the water leak in the cylinder, then ideally remake the cylinder & I've got some tuning mods to do if time allows, but I'll do it in stages. Have a new rear wheel coming too.

[koba]

My what a large radiator you have!

[F5 Dave]

Std RS baby. I didn't bother running the big one on the 50, but the 100 will have to shift some more heat, probably inefficiently at this stage until I change the gearing to the pump so useful.

[TonyB]

Its a shame you can't use competition engines. Early RS125's had a piston that was essentially identical to an H100 piston, except it had a bigger diameter. I had a therory that they took an H100 piston mold and just bored it out a bit.... So in theory you could just sleeve down an early RS125 barrel, throw an H100 piston in and jobs done. Of course that would be cheating, but there you go.

[F5 Dave]

Maybe I should just be done with it & fit an RS125 engine then weld some skoady outer covering from hacked up MB engine over the outside. While we're cheating we might as well fit a 144cc kit that are common in the US for MX engine.

Then I suppose it it all about staying in 2nd position and using just enough throttle to slip by on the last lap & hope no one notices you are making it all up on the straights

[k14]

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Maybe I should just be done with it & fit an RS125 engine then weld some skoady outer covering from hacked up MB engine over the outside. While we're cheating we might as well fit a 144cc kit that are common in the US for MX engine.

Then I suppose it it all about staying in 2nd position and using just enough throttle to slip by on the last lap & hope no one notices you are making it all up on the straights

So that's why joe is so fast??