Jump to content

GuyWithAviators' 49cc Yamaha Collection


GuyWithAviators

Recommended Posts

  • Replies 53
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

6 hours ago, Threeonthetree said:

Crikey!

How easily did the big block slip in there?

Bloody piece of piss. Just had to take out the rubber spacer blocks from the mount holes. 

The foot rests don’t fit though as the clutch hump is at the back of the engine rather than the front. Need to cut and weld them at a different angle under the exhaust. 

  • Like 1
Link to comment
Share on other sites

  • 11 months later...

Ah so yep this now has a PW80 donk in it - yeah the kids dirt bike. 

2012-12-25_14-41-05_794_zps10d3e8d1.jpg

Bolted right into the frame with only a small mod to the oil pump cable needed and the right foot peg having to be cut and rewelded at a different angle. 

I swapped the points igition /stator over to the PW80 block to make it easier to keep the lights etc. 

Then got bored of the average paint job I'd done so stripped it back down again.

This is the result. 

IMG_5064.thumb.JPG.678b2dc12d045ad73d69cafaf1219359.JPG

IMG_5067.thumb.JPG.e24a8358523061d68587a249d189022d.JPG

A friend of mine who may or may not work at Air NZ helped me paint it. So if it looks like Boeing black that may be true...

I also bought a NOS front guard and rack for it and some repro rear side covers and a leg shied, changed the rear trail light and lowered the front a little. Love the look of it now. 

  • Like 8
Link to comment
Share on other sites

Then the top end sounded a bit rattly so decided to put a new top end on - eBay special. Nice castings. 

Old top end: 

IMG_5328

New top end: 

IMG_5336

Went together fine but 5km up the road it locked the back wheel up on me. Hmm weird. Just a lean seize - see the marks on the corners of the piston / cylinder. 

IMG_5397

 

IMG_5400

This is running a pod filter straight onto the carb - no airbox etc. 

So I got some larger jets from NZ @Raizer Scootercare and got 7km up the road this time. 

So I tried fitting the stock V50 airbox and sucess - it was very rich and 4 stroking. This means I have room to safely jet it down. 

IMG_5403

But even with the smallest stock size jet it did the same. Realised the factory V50 intake tube was way too small to replaced this with a straight bit of tube matching the carb throat size.
That - with the stock size jet and some foam in the airbox is perfect. 

 

 

  • Like 5
Link to comment
Share on other sites

Then the next week I loaded it up on my Landcruiser rack and trucked down to Christchurch to ride a few hundred k's with QCR / Easties / Moped NZ. 

30261372_10204143228778367_6389970936178671616_n

Stopped off for a pest in Wellington on the way too.

IMG_5474IMG_5485

Bike ran flawlessly over the weekend and I've done heaps of rides on it since. This engine swap hasn't increased the top speed much but it gets there a lot quicker - I love it. 

29357204_10155464386563364_3007877997748751755_n

Future plans include this rare V90 engine I picked up and this Malyasian Yamaha Mate100 aftermarket expansion chamber I brought over. 

IMG_6530IMG_5109

 

 

  • Like 7
Link to comment
Share on other sites

  • 1 year later...

Update on my V50. Looks much the same as in 2018 but I raised the rear suspension a little, my cutties were too low. Matches the front now, had reverse rake before. Comfy too.

5DMK8254.thumb.jpg.720ce3a9209d4b62ca61a37875733c6d.jpg

Also added 72 spoke rim set and white wall tyres (2.25f / 2.5r) - well just the rear at the moment. They're made for a Honda C50 so the front hub is a bit different in regard to the brake stopper location. I almost got it working with a V90 front fork and Honda C200 hub which has an arm to hold the hub for the brakes rather than a small nub sticking out of the suspension arm - but it moved wrong with the leading link stz and would bind up everything. @mo999 is working on a fix though, has drawn some arms up to suit Honda wheel into Yamaha fork with inspiration from 'Draft Customs in Thailand lowering front suspension links' 

And a handy wee middle basket from Malaysia - it's for a Honda Wave 125 but some trimming with the dremel and bending of the supplied brackets it fits. Can fit lots of lasagne toppers and Lion Browns in it. 

5DMK8256.thumb.jpg.a6055908936649b23e1b1ee55deb180d.jpg

  • Like 7
Link to comment
Share on other sites

Oh, also wanged the V90 motor and Mayalsian spanny in it. 8-)

5DMK8239.thumb.jpg.a13bf8913da084be2d5d94b35e2d4dd7.jpg

Looks and sounds pretty saucy. GPS says it does 92kph lols. I put a smaller rear sproket on too, 32t compared to stock 39 (I think). Lost a little acceleration of course but not hard to change back when I want wheelies. Jets for this carb are expensive and limited size so I've been playing with Aliexpress micro drills to get more fuel into it. Little worried about seizing it as V90 parts are really hard to come by. I need to go richer still, until it starts 4 stroking / plug is rich then go down a couple sizes on another jet. Running a metal meshy pod filter. 

5DMK8240.thumb.jpg.ccc55bf493847918324eb64deed4d178.jpg

The can on the end does nothing, it's quite loud. I packed it with muffler packing and it made it a bit deeper. It'll do. 

 

  • Like 8
Link to comment
Share on other sites

  • 1 year later...

One day I’ll update this thread in more detail but basically I also have this Yamaha, a 63 YG5. 
 

36933C4F-97CC-4774-970F-384856605356.jpeg.996aa2927b7df30f770db9ba25ba5746.jpeg
 

4CED6D0D-C9AF-41CA-B2CF-849E6AF752CD.jpeg.2b062ace67e51cc44894b3eaaf25f0c9.jpeg1AED170C-E90D-4101-A5A7-DBFA3BB1BC9D.thumb.jpeg.2c1db6b91f1955f3918f133e53a503c7.jpeg

It was a bit slow so I swapped the motor out for one I picked up in S.E.A. It’s similar to a TTR110 kids dirt bike but no electric start. 

See the story here if you’re interested in the weirder side of small bikes. 

 

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...