Will I get my 100 ready in time for Taupo?

**husaberg** · 31st August 2012, 18:53

Originally Posted by F5 Dave

Mk1 I could have run the balancer if I needed to, but tract was horrible, mk 2 looks like pics pretty much which was the obvious progression. But mine doesn't look like it was done with a chisel. Theory is all very well, but I'm nowhere close to the power I was getting with Mk1 so we'll see if that changes.

Ah... the inlet track airflow etc (or any other part assuming it's not a stress raiser) doesn't give a damn what it looks like.
i think that's Cameron isn't it? (Paraphrased a bit.)
the Swedish inlet is shaped a little better than mere chiseled (i am assuming you meant the swede)
As you know smooth may look cool but the reed valve covers most of it anyway.

I suspect there a re some minor details holding your new one back, rather than anything major.
I tried to find the close up of the crank-reed (in hindsight i think it was another swede that done it rather than Roffe) (Found later attached below)

If Vanessa is ever finished. The next one will be a Disk valved Mb100 or NSR125/100.

**F5 Dave** · 31st August 2012, 21:46

that thing is a piece of shit, it has far too much weld & will be porous as all fuck. RS125 cases often turn to junk after a few years & can't make the same power as they used to, but that has no chance of not breathing through the welds. The pretty black paint won't help it.

Maybe it will produce good power despite the issue.

**husaberg** · 31st August 2012, 22:15

Originally Posted by F5 Dave

that thing is a piece of shit, it has far too much weld & will be porous as all fuck. RS125 cases often turn to junk after a few years & can't make the same power as they used to, but that has no chance of not breathing through the welds. The pretty black paint won't help it.

Maybe it will produce good power despite the issue.

Meowll bad night Dave

Welding cases is, as you say not ideal but there is products made esp to seal casting's.
For instance all the Aprilia cylinders were "Hippled" (whatever that process is) Me i would just use a proprietary sealer myself.
With sand casting or welding up old cases rather than pressure di casting issues can occur,
but a piece of shit, i'm sorry no, i disagree with you there Dave, even if it wasn't a Honda

**F5 Dave** · 2nd September 2012, 23:12

Alcohol, what can I say?

Either way what do you care?, its not like you made them.

Back to my thread rather than some random bike on the other side of the ocean. Bike runs much freer & sounds quite different, rattly even. That clean up has made it a tickle looser, but not as noisy as it was with the YZ piston. First up just about 22hp. Tickle back & forward & not much better, just break.

Well at least its better & will do for the BOB. Next I must try the un-flowed reedblock & some other reeds. The ring I have had a bit of clearance so I'd like to test for seal. The other issue that I haven't had time to fix is the transfers are a bit proud of the piston at TDC & the ex timing is a bit down on before, but I really was expecting the other 'improvements' to compensate. The end result cares not for what 'must' be better, which is why you have to test.

**Fooman** · 3rd September 2012, 11:52

Originally Posted by husaberg

all the Aprilia cylinders were "Hippled" (whatever that process is)

Hipped = HIP = Hot isostatic press(ing).

The casting (and it is generally only used for castings) is heated to sort of near the melting point (or a temperature at which the alloy can creep - time dependant non-elastic deformation) inside a pressure chamber. High pressure is applied (e.g. 100 MPa, depending on the tempature/alloy/component), and the resultant pressure acting equally on the casting (the "isostatic" bit) closes all the non-surface breaking porosity/voids in the casting, via a creep deformation and solid-state diffusion "welding" mechanism, but without gross deformation of the casting.

Is commonly used on cast turbine blades, where the porosity can act as crack initiating defects. Also done as part of powder metallurgy production processes, very much like sintering.

I'm not sure how it would work on closing a through leak however - there has to be a pressure seal for the HIPing to work, and if there is a surface breaking crack, it won't seal - the HIPing gas (Argon) will just get in. There may also be a diffusion brazing process involved if that is the case, or it could just be used to prevent the formation of a crack in service (initiating at a casting void).

Cheers,
FM

**F5 Dave** · 28th September 2012, 14:04

Well its been an eventful last 2 meetings, the BOB in Chch & Kaitoke Enduro. Both had engine failures so I'm not covering myself in glory.

I did note that my boostport is restricted by my repair so that has been ripped off & done again. New piston & rings to follow (after I strip the bottom end to get out the remainder of the piston) & maybe a tickle-up with my new RA grinder if that works (experimental system). Piston goes lower than transfers now destroked, so want to correct that.

**F5 Dave** · 15th October 2012, 16:41

To add to the drama a piece of piston got caught between the BE & the cases & broke the cases & bent the crank or twisted it out of alignment.

Hope to have it back together for next meeting, but it is delaying the other projects like fitting up the Ignitech which requires a new backplate, but who's got time when I'm having these issues?

**crazy man** · 15th October 2012, 18:30

good luck thanks for answering the carb qestion. how much power have you got out of your 50?

**speedpro** · 15th October 2012, 18:31

An FXR is looking better and better

**husaberg** · 15th October 2012, 18:33

Originally Posted by F5 Dave

To add to the drama a piece of piston got caught between the BE & the cases & broke the cases & bent the crank or twisted it out of alignment.

Hope to have it back together for next meeting, but it is delaying the other projects like fitting up the Ignitech which requires a new backplate, but who's got time when I'm having these issues?

Shit you are having a rotten run of luck Dave.
You did change the cases from the originals, as well too didn't you.
I guess the longer mine don't go the less it will blow.....

**F5 Dave** · 16th October 2012, 09:07

I was a bit lucky with the cases as they are a heap of work & non std mounts. It just ripped the ally so I taped it back into alignment & dremeled a groove to fill with devcon as non load bearing area at bottom of crank.

**F5 Dave** · 21st October 2012, 17:35

Getting bored with this. Done a heap of work to correct the transfer floors & a few other things. Ran piston in today at a secret testing track. Seized lightly again. I'd noticed it felt a little flat so in spite of it always showing best on the 290 jet on the dyno in many incarnations with these mods maybe it needed a bigger jet, so I changed from the 300 I was running to the 310. better. then to the 320 that it wouldn't pull before. better still. Then it nipped slightly. bizarre. Only slight mark so should clear up.

**crazy man** · 21st October 2012, 18:39

Originally Posted by F5 Dave

Getting bored with this. Done a heap of work to correct the transfer floors & a few other things. Ran piston in today at a secret testing track. Seized lightly again. I'd noticed it felt a little flat so in spite of it always showing best on the 290 jet on the dyno in many incarnations with these mods maybe it needed a bigger jet, so I changed from the 300 I was running to the 310. better. then to the 320 that it wouldn't pull before. better still. Then it nipped slightly. bizarre. Only slight mark so should clear up.

bet your sick of it Seizeing . have the cases had some heavy welding done to them? maybe the top of the cases need re maching square to the crank.. l guess you have new seals in the motor.

**F5 Dave** · 23rd October 2012, 08:20

Only real light welding as I've learnt that lesson, rest is devcon. new seals, new everything, wanted to make a good start rather than the crap I'd been working with. But it hasn't panned out. I've never seized so much is a gross understatement. The last bike was my MB50. Hmm.

Had leak tested it, very small leak so I devconed it.

Felt it get a little draggy & then it just rattled so I pulled the clutch. Popped the head & couldn't see anything obvious until I got to the other side & after a min decided it was ally. I'll pull it down tonight.