Re: Mbk 51 project

I got sidetracked again.

I painted the frame and it came out alright.

I kept thinking about the raw steel and the shiny golden braze and got tired of

unhappily staring at the curing paint so I restripped it.

I already started to rust sections and will be converting the rust to iron phosphate to give it a blacker color.

I sprayed clear coat on the seat section to see what it looks like and It looks really cool all glossed up.

I am going to polish the braze and maybe the original welds and give the reinforcement tubing, side rails and tank sides a bright brushed finish and clear coat the whole frame.

I added reinforcements to the swingarm.

Notching by hand is pretty frustrating. The bent tubing piece took so long to get both sides good enough for welding.

Still have to clean up the welds.

(I keep forgetting to practice beforehand)

I got one fork tube ready for shortening but the non disc side is giving me trouble.

The disc side broke loose with an impact while compressing the fork upside down. The other one I need to have some extra hands so I can compress the fork more while trying to spin off that bolt

I have two of these av10 front disc wheels and I cannot find a rear so I am going to see if I could use one as a rear.

If I can get good alignment with the disc as a stand in for a sprocket it is just a matter of getting a sprocket made to fit the bolt pattern and center hole size.

Rebelgears can make me a giant one for around 60$ out of 7075.

For rear brakes I am stuck.front disc only? Magura hydraulic rim brake on the rear would probably be sufficient. Maybe? Figure out a way to mount a disc on the other side?

There's a cap of sorts pressed(?) into the wheel. Its too thin to bolt directly to but if I get it off I could make an insert like the idler pulley front disc solutions and mount a caliper on a spacer.

Re: Mbk 51 project

Not to jack your thread , but , why do you keep using the overly intrusive Photobucket ?

Maybe try using something like : https://postimages.org

It's free and easy to use , with no over the image advertising .

Re: Mbk 51 project

> P D Wrote:

> -------------------------------------------------------

> Not to jack your thread , but , why do you keep using the overly

> intrusive Photobucket ?

>

> Maybe try using something like : https://postimages.org

>

> It's free and easy to use , with no over the image advertising .

Thanks, I'll check that out.

Photobucket is the only hosting site I have tried using and it has always been full of glitches and too many prompts to purchase their products.

Now that I think about it it is a bit obnoxious

Re: Mbk 51 project

> Jesse Simonsen Wrote:

> -------------------------------------------------------

> > P D Wrote:

>

> > -------------------------------------------------------

>

> > Not to jack your thread , but , why do you keep using the overly

>

> > intrusive Photobucket ?

>

> >

>

> > Maybe try using something like : https://postimages.org

>

> >

>

> > It's free and easy to use , with no over the image advertising .

>

> Thanks, I'll check that out.

>

> Photobucket is the only hosting site I have tried using and it has

> always been full of glitches and too many prompts to purchase their

> products.

>

> Now that I think about it it is a bit obnoxious

They 'screwed' me more than once . I still have pics there , but , as I need them , I transfer to postimage or back onto my own hard drive .

Re: Mbk 51 project

I think I have a rear in my basement.

Re: Mbk 51 project

Blake, I will buy it if you find it. I really didn't want to mess with the other front wheel.

I just finished my forced patina. it took less than an hour from raw steel to what it looks like now.

I wire wheeled the edges of all the folds and cleaned up the braze and some welds.

It has a really cool greenish color along with the black.

Gotta clear coat it soon so it doesn't start changing colors on me.

Pd, these images are from postimage and the site is so much simpler than Photobucket. And no advertising! Thanks

Re: Mbk 51 project

You're welcome . :) And , Thank You for making your Pics a pleasure to view .

Now we don't have to try seeing through that PB BS . ;)(edited)

Re: Mbk 51 project

Frame mods look good so far. Will this be a gr1 build?

Re: Mbk 51 project

> niklaus _ Wrote:

> -------------------------------------------------------

> Frame mods look good so far. Will this be a gr1 build?

Sort of. I've just been messing around when I have free time.

It's been fun using new tools and learning.

The engine I built was planned out thoroughly and should work really well though.

I will probably order some stuff from Hubert Cycles to complete the look.

I really like the mvr tank/ seat fairing and the rear fenders are so cool looking.

I would really like to build an engine using the modern scooter kits.

Re: Mbk 51 project

I got the forks shortened and put back together

I disassembled them and thoroughly cleaned everything. The oil was pretty nasty and had a horrible stench

The seals are still good and all the internals look fine so I am holding off on replacing anything

Turns out the forks didn't need to be compressed to remove the bottom bolt.

I tried clamping the second fork in the vise and the bolt broke free easily.

I cut a bit less than 4 inches from the springs and put the cut portions under the lower spring.

After assembling one I noticed there was a lot of play and some noise so I ditched the springs and cut spacers out of bicycle handlebars.

The upper spacers are 7/8" so I figured the handlebars should work.

Stock these forks came with 170ml of 7.5w oil.

I put around 180ml of 15w Maxima fork oil and they feel really nice. A lot stiffer than they were.

They are about two inches longer than the Ebr's on my 103.

The lower tubes are pretty long so I couldn't go too short. I think there is enough travel and I can always add some preload and heavier oil if I need to.

I need to get a French crown race so I can properly mount the forks.

The five stars are just for the mock up as I will not be using them anymore.

Re: Mbk 51 project

Anonymous User /
scootertrash

Looking awesome, the swingarm is neat.

Re: Mbk 51 project

> Megasaurass Rex Wrote:

> -------------------------------------------------------

> Looking awesome, the swingarm is neat.

I used a clutch pulley as a die. The radius was too big so I had to finish it by squeezing the ends together.

Re: Mbk 51 project

What exhaust is that? Carte noir?

Re: Mbk 51 project

> jordan * Wrote:

> -------------------------------------------------------

> What exhaust is that? Carte noir?

Yeah, It's the Ninja G2 open. A reproduction made by Mir35

Very pretty tig welds and .8mm sheet

Re: Mbk 51 project

Johnnie Distefano /

Looking amazing!

Re: Mbk 51 project

Trade a front for a rear? My MBK Magnum needs a disc front.

20191113_095448.jpg

Re: Mbk 51 project

> Blake MD No PM Plz Wrote:

> -------------------------------------------------------

> Trade a front for a rear? My MBK Magnum needs a disc front.

> >

Is the wheel complete or is it missing the stuff not shown?

Pretty cool that you have the m29 on there :)

Re: Mbk 51 project

I have it all here somewhere. If I cant find it I can take it off this other project and worry about replacing it later.

20191113_191839.jpg

Re: Mbk 51 project

I welded radiator mounts to the frame.

Going to use 10mm stainless tubing to attach the radiator.

I traded Blake a front wheel for a rear.

I took it apart and tossed the crusty bearings. Degreased everything and put some stripper on and discovered the paint was some kind of latex or rubberized coating. Nightmare.

I spent hours peeling and scraping and wire brushing but got it all off.

Just needs some paint to match the front

I am starting on the Malossi g2 replica and am figuring out the flow into the cylinder.

The stock durations are 128/184 and I will be raising them to 132/194 and the exhaust port will be widened to around 70% of the bore.

The reed block sits against the intake passage wall and the charge has to go around an almost square column. No good.

The red lines show the basic direction of flow from the reeds.

I am gonna cut into the column and smooth out everything, leaving plenty of material around the cylinder stud.

The skirt sits really low and is a definite obstruction. It protrudes about 3mm into the charges flow as well.

The black line shows where I want to cut.

Will make sure I don't cut into the nikasil.

I did this with the Mvt cylinder on the other engine

Here is a pic from when I was building that engine (stock cases)

I also have some parts on the way for a third engine.

Minarelli horizontal.

Re: Mbk 51 project

Some more progress.

I got the wheel painted. I used a satin black acrylic and it is a close enough match to the front wheel.

I also painted the it175 triples the same black

The Mlm swingarm came with some ugly mx style footpegs without a proper way to install them so I found some new ones on eBay for less than $5.

They even came with springs, pins and e clips. They almost match the original style too.

They didn't fit so I had to narrow the mounting part a few mm on each

I modified the cylinder and cases on the LC engine. I still need to do all the finishing by hand with sandpaper.

And match that third transfer.

I also started cutting up some scooter cases. Got all the big stuff off with a cut off disc.

It's gonna take many hours to clean the rest of the excess material off and make them look like French cases

I am really excited about building up this one

Re: Mbk 51 project

> Jesse Simonsen Wrote:

> -------------------------------------------------------

> Some more progress.

>

> I got the wheel painted. I used a satin black acrylic and it is a close

> enough match to the front wheel.

>

> I also painted the it175 triples the same black

>

> https://i.postimg.cc/hGfdQYCZ/IMG-20191207-194831762.jpg

>

> https://i.postimg.cc/mgWPMdnL/IMG-20191127-162047502.jpg

>

> The Mlm swingarm came with some ugly mx style footpegs without a proper

> way to install them so I found some new ones on eBay for less than $5.

>

> They even came with springs, pins and e clips. They almost match the

> original style too.

>

> They didn't fit so I had to narrow the mounting part a few mm on each

>

> https://i.postimg.cc/4yCY5B3Q/IMG-20191207-210624144.jpg

>

> I modified the cylinder and cases on the LC engine. I still need to do

> all the finishing by hand with sandpaper.

>

> And match that third transfer.

>

> https://i.postimg.cc/tghwJgxR/IMG-20191208-223644443.jpg

>

> https://i.postimg.cc/053M55dJ/IMG-20191201-214535523.jpg

>

> I also started cutting up some scooter cases. Got all the big stuff off

> with a cut off disc.

>

> It's gonna take many hours to clean the rest of the excess material off

> and make them look like French cases

>

> https://i.postimg.cc/JnHyZ9Rh/IMG-20191208-210508897.jpg

>

> I am really excited about building up this one

I thought about doing this but couldn’t come to the conclusion to cut up a Yamaha jog case.

Are you going to use the stock varaitor set up from the Yamaha jog?

Re: Mbk 51 project

Rocco, I'm going to be using either the Stage 6 or Malossi over range.

The over range variators are closer in size to the av10 variators.

I will still need to shim it to run a thinner belt or have my rear pulley machined to accept a scooter belt.

The place I got the cases from sent the wrong ignition side initially and they let me keep it after sending the correct one.

It is from some 90cc minarelli horizontal something or other and has larger bore diameter and larger crankshaft opening.

Could probably fit a giant 90+cc kit and crank without machining.

I'm almost tempted to buy the other side but then I'd be building up a fourth engine for an unfinished bike and that may be a bit much

I definitely enjoy messing with the engines more than the cycle part

Re: Mbk 51 project

Dude that thing is going to be so fast!

Re: Mbk 51 project

It should get progressively more powerful with each new engine.

I don't think I will try anything bigger than 70-80cc on the minarelli engine. Maybe if I get a 50cc motorcycle frame I could try one of the 90+ kits.

The mb5 frame looks like a good candidate for a parallellogram engine set up.

I was able to get my 103 up near 60 and the kit and pipe on it are pretty mild. That was with a 52 tooth rear though which made the low end pretty awful.

Gonna start with 11/ 60 gearing on the Moby so speed will require lots of revs.

Re: Mbk 51 project

Got the ignition side case half cleaned up.

It would require a lot more work to make these look like av10 cases.They are extremely wide compared to av10 cases.

I will probably cut more off later when I need to figure out engine and spring mounts

Re: Mbk 51 project

> Jesse Simonsen Wrote:

> -------------------------------------------------------

> Got the ignition side case half cleaned up.

>

> https://i.postimg.cc/vB2Ng1X9/IMG-20191210-205006343.jpg

>

> It would require a lot more work to make these look like av10

> 0 cases.They are extremely wide compared to av10 cases.

>

> I will probably cut more off later when I need to figure out engine and

> d spring mounts

Dude your fine..I would of actually of just left it alone. Why would you want to look like av10 case? It a scooter engine mod onto a moped that is a way cooler story. Don’t hide ur talent unless ur trying to foul all the ducks

Re: Mbk 51 project

I don't know. They were so massive. Probably 8 inches wide.

At the minimum I will need to cut back to the bolt holes near the intake area to be able to attach mounts.

The halves are so oddly shaped and nothing is symmetrical.

Cutting them was awful. Had to hold them in my hand and cut one handed in a lot of areas because I couldn't find flats to put them in the vise.

Good thing I don't have to follow OSHA regulations at home.

Re: Mbk 51 project

Mars from Boston put a 103 on an mb5. It would pretty cool looking, but they’re heavy as hell and they handle so poorly.

Re: Mbk 51 project

I remember reading the mb 103 but the pics were gone.

I wonder how much an mb5 frame weighs. The 51 was around 17 lbs after adding all the steel.

I like the look of the mb 5 frame a lot

Re: Mbk 51 project

Hmm im hanging with mars tonight ill see if he has any opinions

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