The Mudbug's new clothes

[Farmaken]

I have been collecting bits and pieces for my new build, and have finally made some progress towards blending them all together.

Frame and swing arm are mc18
Engine is TF125
Forks are vfr400 shortened to 700mm
Shock is R6 Yamaha

17" rear wheel spoils the rake of the forks but the longer shock and shorter forks seem to bring it back somewhere near where it should be

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Hoping to have it running for Tokoroa

[crazy man]

looks like you have made a nice job of the bike. see you at the next meeting

[F5 Dave]

Why can I see what looks like a reedvalve conversion in the darkness? Or is it more RGV150 than Mudbug?

Looks nice. R6 shock will be oversprung/damped quite somewhat.

[crazy man]

Why can I see what looks like a reedvalve conversion in the darkness? Or is it more RGV150 than Mudbug?

Looks nice. R6 shock will be oversprung/damped quite somewhat.looks like a read block welded on to a plate like my rgv tf 100 engine

[kel]

Why can I see what looks like a reedvalve conversion in the darkness?

not to mention the ATAC chamber hanging off the header. Looking good :niceone:

[TZ350]

I like it, it looks the bizzz.

[Farmaken]

Why can I see what looks like a reedvalve conversion in the darkness? Or is it more RGV150 than Mudbug?

Looks nice. R6 shock will be oversprung/damped quite somewhat.

No RGV, all Mudbug. Have made it full Crankcase reed no piston port inlet.

Spring rate is actually lighter than std nsr - diffferent linkage system I guess but feels ok so far. Sag seems about right to start with anyhoo.

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[Bert]

No RGV, all Mudbug. Have made it full Crankcase reed no piston port inlet.


Love it; nice work mate look forward seeing it in the flesh.:Punk:

[Dutchee]

where you at the first round of the NI series? Kept meaning to ask Mike, but never quite remembered while talking to him.

[Farmaken]

Didn`t make it to Auckland for round one - combination of Wife`s birthday and useless staff being off work on ACC again.

[F5 Dave]

Ahh, Greenie did one like that.

[jasonu]

No RGV, all Mudbug. Have made it full Crankcase reed no piston port inlet.

Spring rate is actually lighter than std nsr - diffferent linkage system I guess but feels ok so far. Sag seems about right to start with anyhoo.

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Is that a 28mm carb with some sort of filler (devcon??) to reduce ot to 24mm?

[F5 Dave]

oh yeah good point. I guess its a 125, never occurred to me (even though said at the top, used to 100s in the old days with TFs). Looks like a ally sleeve possibly pinned on the right & cut for the needle jet.

[Farmaken]

Well spotted you two, 28mm Mikuni ex 3xv tzr250 with ally sleeve

[F5 Dave]

Really? I would have said 1KT (or 2MA which is the same) I thought the 3XVs had 34s or something, but that queer protrusion under the PJ tube is odd. . ..Hmm ok seems the Rs had 28s, but the SPs had 36s.

Does that protrusion hole need plugging? I suspect it leads to an air solenoid like on a Jap model RGV & is meant to open when idling for emissions reasons. I'd bung it up for first try.

[koba]

That's real cool!

I'm interested to pick your brains about how the R6 shock is at Tokoroa.
I plan to give it a try with mine, which is also MC18 framed, I think it has a good chance of working well.
Experimenting with it is being held up by me not getting a new pip finished, the current one is close to the bottom of the swingarm and is stopping me raising the rear as the bike so desperately needs. (I also have a 17 on the back.)

[Farmaken]

Cheers Koba, what motor have you got in yours ?

[koba]

Cheers Koba, what motor have you got in yours ?

MB100

Currently about 14hp but I hope for many more; just have to do the work!

[gav]

Whats the tail section? Looks great !!

[Farmaken]

Seat is Aprilia Rs250 which has been trimmed slightly - taken a mould off it if you are interested

[Farmaken]

IT LIVES !!

Went over to Edgecumbe track yesterday and did a few laps - we are go for Tok :woohoo:

[TZ350]

Great stuff, C U @ Tok.

[Farmaken]

So ,had our race debut and have to say I`m pretty happy with it first time out with minimal setup.
Rear tyre was 10 years old and would not ball up and work properly, also had some carb issues which I hope will be sorted for Taumaranui.

Tyre has already been changed for a near new Pirelli SC1 - should be a vast improvement in the back end .

Suspension was better than I thought it would be - front was magic and shock worked really well with the honda linkage letting it travel through its stroke without being harsh at all.

[Farmaken]

Not a mudbug this time but a tzr50 in a cut down RG250 frame

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[Rick 52]

Auckland F5 contender for next season ?

[mr bucketracer]

did you ride that into a brick wall to steepen the front end up lol ...looks cool

[F5 Dave]

You have done a very cool thing. Always talked about this.

[Farmaken]

I thought i would give the Bucket a run on the big track (Taupo 2) - had a great time at round 2

Managed a PB of 1:25.8 in qualifying but it came at a price.....

Stoopid me forgot to change to a colder spark plug so by lap five of practice the plug electrodes had melted which started the dreaded Detonation

That resulted in a siezed piston which I figured to be no big drama as I have a spare in stock....................



Then I took the barrel off and noticed a funny line across the bottom gasket face :doh:

So, need to make a new barrel for the GP as well as finish the 50 - That detonation is powerful stuff eh !!

[F5 Dave]

MY. WORD.

ah, bit of Devcon & it'll be fine.






all interviews and opinions in this forum are not the express liability of McBarstds inc & no litigation will be entered into.

[TZ350]

I feel your pain .....

[koba]

Not a mudbug this time but a tzr50 in a cut down RG250 frame

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Bugger about the Mudbug!

Is this one a goer yet? (Thinking F5 GP)

[Farmaken]

Waiting for a flywheel to arrive then it should be all go

[koba]

Waiting for a flywheel to arrive then it should be all go

Awesome!!!

There could be really quite a resurgence this year.

Must start that poll.

Mañana.

[Gus25]

Hi Farmaken, Did you leave the oil pump on the engine or are you using premix? I'm putting a tf125 into an rg250 frame at the moment (will start a build thread soon).

[Farmaken]

Hi Gus, no oil pump on mine - running premix

How far along is your build ? Will we see you at Tokoroa next month ??

[Gus25]

Will be at Tokoroa but running my Honda. Suspect the rg/tf will be rolling by then so will bring it along so you can have a looksie.

[Farmaken]

So, the 50 is a runner - now to finish the new mudbug barrel :banana::banana:

[seymour14]

So, the 50 is a runner - now to finish the new mudbug barrel :banana::banana:

Great news, not a moment to spare! You get my vote!! :clap:

[koba]

Yuuuuusss!

Another 50 on the Grid!

Loving these numbers!

[F5 Dave]

Indeed good effort guys

[mr bucketracer]

so what happen at the gp ken ? was told you had some promblems

[Farmaken]

The new barrel had sex with the piston....
Turns out it was an air leak as suspected - the original carb mount/ inlet duct has been cut off the barrel and filled with devcon but in my haste to get the new barrel done I can't have cleaned the port properly before the Devcon went in. Was ok until it got hot for the first time then started leaking.....
and after several laps of cutting in and out it seized on the inlet side. Could not work that out when I first pulled the barrel but the air leak and seize are in the same place

Problem has been fixed by welding an alloy plate into the port over the Devcon so should be cured

[F5 Dave]

It looked pretty violent

[mr bucketracer]

oh well there is always next year as we say lol in my case always had some silly things go wrong like the wheel bearing giving up at foxton with 3 laps to go in 3thd place or a wire breaking leading it at taupo .. now the dam body giving up . got a exersize machine now :weep:

[F5 Dave]

Hope it folds up conveniently for storage under the bed:whistle:

[Farmaken]

I was gifted an nsr250 cylinder with damage from worn power valves and flakey plating - thanks Rob. Initially intended to try and replicate the port and duct layout in a mudbug cylinder, but then on a wet weekend I got a bit loose with the disc grinder and Tig welder.
Pictures tell most of the story....310865310866310867310868310869310870

Water jacket has been removed and fins will be welded on instead.... Might work , might not but it beats watching shite TV.

[chrisc]

Holy shit. That cylinder looks like a torture victim! I applaud your enthusiasm Ken. Pretty keen to see how it works out for you. In the mean time, how about I ride your current bike? :drool:

[kel]

Water jacket has been removed and fins will be welded on instead
Man I wish I could weld.
I seem to remember Yow ling has a finned RGV250 cylinder on an RG bottom end, might be worth talking to him about what they did and if it worked out. Remember the NSR has a 54mm stroke so you'll probably have to raise the bottom of your transfer ports. I loved the old (MC21) NSR's, they were absolute tractors compared to the RGV's.

[Farmaken]

Bore will be 54.5mm Stroke will be 54mm - almost factoryish.

[husaberg]

Man I wish I could weld.
I seem to remember Yow ling has a finned RGV250 cylinder on an RG bottom end, might be worth talking to him about what they did and if it worked out. Remember the NSR has a 54mm stroke so you'll probably have to raise the bottom of your transfer ports. I loved the old (MC21) NSR's, they were absolute tractors compared to the RGV's.

Pretty sure that would have been a Pete Jones Motor (Oyster on KB.)
http://www.kiwibiker.co.nz/forums/member.php/6786-oyster

[Rick 52]

Water jacket has been removed and fins will be welded on instead.... Might work , might not but it beats watching shite TV.[/QUOTE]

Great work Ken, I think your onto a winner :)

[mr bucketracer]

good thing is ,its done in real bucket way! not just bolt on bullshit

[Yow Ling]

Pretty sure that would have been a Pete Jones Motor (Oyster on KB.)
http://www.kiwibiker.co.nz/forums/member.php/6786-oyster

yes it is Petes engine , RG150 barrel with a sleeve and fins shrunk onto it

[koba]

yes it is Petes engine , RG150 barrel with a sleeve and fins shrunk onto it

Work alright?