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Gazdaman |
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Gazdaman I did a trackday!!!
Joined: 12 Aug 2004 Karma :
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Posted: 14:20 - 14 Apr 2007 Post subject: MZ trackbike engine rebuild. |
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Ok, story begins as of Easter sunday 2006.
https://www.gaz-racing.co.uk/images/Silverstone/Full/Mz-fresh-orange-cropped.jpg
I was happily hooning around Silverstone when I seized.
To cut a long story short Dad took it apart and found the big end had gone. So Dad bought a crank and con-rod off eBay for £16. Bargain.
Now the task of splitting the cases to fit it!
Just take it as read that we split the cases. (Dad actually split them because with my rash decision-ness I left 3 bolts in and just kept hitting it harder and gave up).
So we'll start the story from the re-assembly.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9348%20(Small).JPG
New main bearings and crank oil seals. We also built it into a set of new eBay crank cases which cost £9
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9356%20(Small).JPG
I swapped over all the bearings from the old crank cases with the aid of a blowtorch and a 'drift'. (Read big 'ammer). I greased up all the bearings thoroughly before putting them in the new cases and placed the gearbox in.
On my first go of slotting the gearbox in I got it all in upside down, and wondered why I could only get two gears!
In this picture the main bearing and oil seal are already in the casing. The crank is then placed into the main bearing. (By placed, I mean 'ammered).
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9384%20(Small).JPG
With the con rod held by 2 extension bars and 2 bits of wood I could press the clutch onto the crank. The primary and secondary drive gears have already been put on in this picture.
You need a shim to fit over the crank but press against the clutch, then tighten down the nut to press it onto the crank.
Instead I used 2 15mm spanners. Did the trick.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9386%20(Small).JPG
Clutch cover back on, I fabricated a blanking plate out of aluminium to block the hole where the old oil pump was. Otherwise gearbox oil pisses out.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9390%20(Small).JPG
Front sprocket on, minus 3 teeth.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9393%20(Small).JPG
Tarty stator and generator (electronic ignition system) pressed onto the crank, barrel studs in, and piston replaced.
The piston has lost a piston ring because it was broken. They have 3 anyway as standard, so I'm just going with 2.
New base gasket too.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9394%20(Small).JPG
Empty shell of a bike looking sorry for itself.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9395%20(Small).JPG
Right crank case on, barrel on.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9409%20(Small).JPG
Engine back in. And it runs! I can even select all the gears. I havn't had a chance to test it properly. So Llandow in June will be its first proper test.
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9415%20(Small).JPG
Took a trip to a local racer's house today, came home £50 lighter, but with 2 spare engines.
The MZ will live another day!
Gaz
Last edited by Gazdaman on 17:53 - 14 Apr 2007; edited 2 times in total |
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Mr.Everready |
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Mr.Everready World Chat Champion
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Gazdaman |
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Gazdaman I did a trackday!!!
Joined: 12 Aug 2004 Karma :
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Mr.Everready |
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Mr.Everready World Chat Champion
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pwntifex |
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pwntifex World Chat Champion
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Gazdaman |
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Gazdaman I did a trackday!!!
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2Smoke |
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2Smoke Crazy Courier
Joined: 15 Apr 2005 Karma :
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Posted: 18:11 - 15 Apr 2007 Post subject: |
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Gaz, you are lucky!! Good cheap bikes to rebuild those MZ's! An rgv will cost a fortune to do, plated bores, expensive cranks!
I'm suprised you didnt have any tuning work done whilst it was apart?
Also, this:
https://72.9.145.220/~bristolb/images/MZEngine/IMG_9384%20(Small).JPG
Is not good practice, it can sometimes elongate the small end scrapping the conrod!
Paul ____________________ Currently in the stable.. '89 TDR250, 86 NSR250 '79 350LC, '79 DT175MX, 82, Pasola, '98 R1, '95 Speed Triple.. all of them total sheds.. |
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Gazdaman |
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Gazdaman I did a trackday!!!
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MarJay |
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MarJay But it's British!
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Gazdaman |
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Gazdaman I did a trackday!!!
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MarJay |
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MarJay But it's British!
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Gazdaman |
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Gazdaman I did a trackday!!!
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Wave2k |
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Wave2k G's Stalker
Joined: 06 Apr 2004 Karma :
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Vin |
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Vin World Chat Champion
Joined: 02 Aug 2005 Karma :
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DOS |
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DOS World Chat Champion
Joined: 29 Jun 2006 Karma :
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Posted: 22:33 - 06 May 2007 Post subject: |
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I don't think I would have beleaved it with out the pictures.
Good work Gaz.
Paddy.
Last edited by DOS on 22:45 - 06 May 2007; edited 1 time in total |
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Gazdaman |
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Gazdaman I did a trackday!!!
Joined: 12 Aug 2004 Karma :
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Posted: 22:37 - 06 May 2007 Post subject: |
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Seat unit is from a TZ 250.
And the rear brake set up is a full on bodge up job. There are closer pics of it at www.gaz-racing.co.uk under 'race bike project'.
Thanks for the comments
Gaz |
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Vin |
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Vin World Chat Champion
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Gazdaman |
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Gazdaman I did a trackday!!!
Joined: 12 Aug 2004 Karma :
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Posted: 15:52 - 02 Jun 2007 Post subject: |
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Well, llandow was yesterday and the MZ went really fucking well if I'm honest.
https://www.motographs.co.uk/images/010607-Llandow-SWB/All-pictures//Small/IMG_9724.JPG
The volume of smoke was pretty much comical.
https://www.motographs.co.uk/images/010607-Llandow-SWB/All-pictures//Small/IMG_9736.JPG
But yeah, it handled really well, brakes were pretty damn good, all the gears worked, so I think it can be deemed a success..
I felt it starting to tighten up towards the end of the session so I came in. Don't know if it was nipping up or if it was a fuelling issue, but either way it was brilliant.
Only did 1 session on it though, first session I went out and forgot to turn the petrol tap on, so I managed to get it as far as the first marshal post, about 100yds onto the track.
After I turned the tap on it didn't want to bump start, so back I came on the recovery truck.
Then I borrowed a GS500 from the organiser, he's a cab driver and some drunk bloke couldn't pay so he gave him this bike that had been sitting in his garden.
I was second person out behind the instructor (the owner of my ride), after the two laps of no overtaking I tried to outbrake him into the bus stop only to lock the front wheel and fly past him in a puff of smoke and squeeling. Dodgy.
Then I took a mates SRAD out.
So 3.1 sessions, 3 bikes, knee down on all of them. And a well behaved MZ.
Love it.
Gaz |
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DynaMight |
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DynaMight World Chat Champion
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paulodd |
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paulodd Crazy Courier
Joined: 20 Oct 2004 Karma :
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Posted: 17:42 - 02 Jun 2007 Post subject: |
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Luke_Retrofly |
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Luke_Retrofly Silly Lesbian
Joined: 05 Jul 2003 Karma :
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Posted: 17:55 - 02 Jun 2007 Post subject: |
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So when you racing with BMZRC then gaz
Luke ____________________ Flounced - Long overdue
Fuck you bitch I'm in the top 10 list I can do the what the fuck I want! |
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Gazdaman |
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Gazdaman I did a trackday!!!
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DynaMight |
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DynaMight World Chat Champion
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Gazdaman |
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Gazdaman I did a trackday!!!
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Luke_Retrofly |
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Luke_Retrofly Silly Lesbian
Joined: 05 Jul 2003 Karma :
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Posted: 13:53 - 04 Jun 2007 Post subject: |
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Hi
I reckon you would do well on your stock MZ, you seem like a proper MZ racers, a proper loon, the only way to race em I guess.
What do you need those brakes for anyway .
Luke ____________________ Flounced - Long overdue
Fuck you bitch I'm in the top 10 list I can do the what the fuck I want! |
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Old Thread Alert!
The last post was made 16 years, 332 days ago. Instead of replying here, would creating a new thread be more useful? |
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