by arry_b » Fri Mar 22, 2013 8:19 am
That's an excellent candidate for tidying up, I tend put two or three ETZ125s back on the road every year, just to keep me out of mischief.
Lessons I've learnt:
Change the fuse box for a bladed one. Don't think about it, just do it!
Black stove paint is cheaper, blacker and lasts MUCH longer than VHT on MZ exhausts.
The rev counter drive inside the engine loses it's teeth, don't worry about fixing it as they're not much use - I stick a small digital clock on the rev counter glass, far more useful.
A braided hose on the front brake works well, but a new rubber hose makes it feel nicer - the braided one makes it feel wooden.
Check the primary chain and sprockets. These can get very worn and the engine rattles a lot. It also can throw a lot of swarf around the gearbox, which isn't good.
Replace the pipe between the oil tank and the oil pump. The original goes hard and leaks/sucks in air.
Check the oil pump cable for frayed strands.
A Morris Minor air filter fits the filter housing, and works fine. Far cheaper than an original.
Crank seals (if you need to do them) are easy on this engine, you don't need to split the cases.
Upgrade the front light to a Halogen - P45T base. Around £6 and makes a massive difference.
Mitas Tyres and very cheap (oponeo.co.uk) and work really well on two stroke MZs
The forks are a little on the soft side. A few 2p pieces in above the fork springs makes a big difference (8-12 pence a side?)
It's worth putting in an order for the parts in one go to ost2rad.com, some of the stuff you're going to need (gaskets, mirrors, seat cover, rubbers for grips, levers, cables etc) cost buttons and are generally good quality.
Once finished, she'll find it good to ride. The brakes, and lights and handling far exceed most other 125s out there. My daughter passed her test two years ago and won't give hers up for a bigger bike, it's the same as the one you have there. My lad's got a slightly later one (1992) and it's not as well made.
BTW, nice job on the S51.
Steve