Yamaha 4-Zinger YF60S quad bike

[flymo]

I've been given this quad bike from my neighbors garage but its a non-runner and theres a few engine components missing. Its a 60cc two stroke from around 1986, a shaft drive very similar to the QT50 moped of the same period.

The reed valve and intake manifold are missing.

Anybody know anything about these quads or this particular engine, was wondering if I could salvage some parts or another engine from another Yamaha moped or something.

Also looking for an electronic download of the Yamaha service manual.

[Biker Biggles]

Can you drop a Hyabusa engine in there?:cool:

[plowsie]

I have two CBR engines in the garage you can try and Ram in there :lol: Good luck with weight reduction :lol:

Couple of manuals on eBay in the US mate :(

[flymo]

Can you drop a Hyabusa engine in there?:cool:

err no.

[plowsie]

A deeper look online doesn't show up any manuals.

Is this any good to you matey?

http://www.cmsnl.com/yamaha-yf60s-moto-4-1986_model9202/partslist/

[flymo]

A deeper look online doesn't show up any manuals.

Is this any good to you matey?

http://www.cmsnl.com/yamaha-yf60s-moto-4-1986_model9202/partslist/


Thanks Stu, thats more than I have right now.

[plowsie]

Thanks Stu, thats more than I have right now.
Prices are obviously US, but I suppose could go to Yam UK with codes for prices?

Got any piccies of the beaut?

[flymo]

Prices are obviously US, but I suppose could go to Yam UK with codes for prices?

Got any piccies of the beaut?

Was hoping for a freebie really, dont want to throw any money at it unless I know its a viable runner.

No pics as yet but will grab some tonight.

[flymo]

right, I'm bringing this one back to life... :-)

Spent a few hours in the garage on the quad at the weekend. Seems I have nearly all the bits necessary bar a few seals etc. Have ordered a new set of head gaskets to get the top end back together. I even managed to get a spark from it so making some progress.

I just need to test out the oil pump and service the carb before giving it a try. Body work removed obviously.


http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0653.jpg
http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0654.jpg
http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0655.jpg
http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0656.jpg
http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0658.jpg

http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0660.jpg
http://i634.photobucket.com/albums/uu67/flymo_racer/The%20quad%20project/IMG_0661.jpg

[yorkie_chris]

try run it on premix first then worry about the oil pump

[flymo]

try run it on premix first then worry about the oil pump

Yeah, thats a good idea. Any idea what kind of mix (havent run a stroker in years), I was guessing something like 40:1 or so.

or maybe 32:1 lol http://forums.dirtrider.com/70/6586320/dirt-bike-repair-maintenance/2-stroke-premix-ratio-aaaarrrgghhh/index.html

[yorkie_chris]

Whatever, let the pump sort the mixture when you've proven it working. 30:1 will do.

I'd also atomise some premix down the intake plug hole and kick it over with the plug out. Better to let it smoke a bit when you first start it and know it's well oiled at first :)

[flymo]

I'd also atomise some premix down the intake plug hole

? What do you mean Chris?

[yorkie_chris]

Sorry intake AND plug hole.

Just bob some premix in one of those spray bottle things and spray some in while you kick it over. Disconnect the coil while you do it.

The oil/petrol will soak around the bores/rings and get to the bottom end bearings.

[flymo]

Sorry intake AND plug hole.

Just bob some premix in one of those spray bottle things and spray some in while you kick it over. Disconnect the coil while you do it.

The oil/petrol will soak around the bores/rings and get to the bottom end bearings.

ok, understand. wonder if my Mrs will notice I've had two stroke premix in her hair spraying bottle :-)

[yorkie_chris]

Nah she'll love you, castrol TTS smells great!

[flymo]

I bunged a compression tester on it last night, got just short of 100psi without any head gaskets on :-), there was a little scoring to the exhaust side of the piston but hopefully it will run as it is.

Anyway, parts are on the way so fingers crossed.

[Specialone]

I got a spare '84 cg125 engine your welcome too if you need something, needs points etc sorting out but good compression.

[flymo]

I got a spare '84 cg125 engine your welcome too if you need something, needs points etc sorting out but good compression.

thanks, I'll bear that in mind. The difficulty would be mating the two together as the quad has a shaft drive. Fingers crossed I can get it running as is.

[flymo]

bugger, think I might have a knackered control unit, it went pop and now no spark

[flymo]

right, just deciding wether to buy parts or scrap this thing and find another. I know the control unit is knackered, replacing that and the CDI will cost me just over £100.

[flymo]

sod it, ordered a new CDI and control unit. Final spend on this quad, if its dead after that it gets launched in the river.

[squirrel_hunter]

sod it, ordered a new CDI and control unit. Final spend on this quad, if its dead after that it gets given to Squirrel.

Thats such a kind offer. I couldn't possibly. Oh go on then...

[flymo]

Thats such a kind offer. I couldn't possibly. Oh go on then...

lol, Swindon is a long way to push a quad bike to :-)

[Neeja]

...I may well be tempted by it if it's going to be put in a river... ;)

[squirrel_hunter]

lol, Swindon is a long way to push a quad bike to :-)

I was thinking of a trailer, but if you're offering to push it all the way down to me as well. Your generosity knows no bounds. What a guy.

So... You got it working yet, when do the parts arrive?

[flymo]

I was thinking of a trailer, but if you're offering to push it all the way down to me as well. Your generosity knows no bounds. What a guy.

So... You got it working yet, when do the parts arrive?

Easy tiger :-), I'll be collecting the parts next week when I'm over in the USA. I dont give up that easy though, I witnessed a spark and a reasonable compression reading so I know there's hope.

[flymo]

so, this was one of those projects that got pushed to the back of the garage under a pile of other stuff. Next thing I know nearly two years have gone by.

And the quad is back on the bench! I have no spark at the moment, just systematically testing bits to figure out why. The only thing that appears way out of spec tot he workshop manual is the resistance readings from the pickup coil, I have a donor motor that has a good resistance reading for the same coil. I'll be swapping that over as soon as my rotor puller arrives.

Not sure on the ignition coil health yet but we'll see once I've swapped the pick up. I should probably treat it to a new plug cap while I'm at it.

[Sid Squid]

I imagine you're already aware, but be very careful when you're testing the ignition - CDI systems can produce proper stingy voltages seemingly by magic.

And it can hurt, lots.

[flymo]

Ha, that sounds like a voice of painful experience. I haven't had a belt yet and don't fancy starting now :-)

[flymo]

After buggering around with the magneto trying to remove it and get to the pickup coil behind, I stumped up a couple of quid for a suitable puller. Voila! 10 seconds later it's off :-)

The resistance readings are way out compared to the manual, I'll be swapping that out later today and hoping for a spark.

[flymo]

Wooohoooo! it's alive!

Managed to get a spark ok, was a dodgy pickup coil. Replaced the reed valve as it wasn't sealing properly, cleaned out the carb and gapped the spark plug properly and away she goes.

Just need to get the shaft drive back together and see if it'll move.