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TimShadboltfan27

Nick's 1979 RX125 resto

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Little bit of progress on this thing, has been a bit of a one step forward two steps back type operation. Have taken this for a few test rides so far. Can confirm it goes hard for what it is. should try track down a go pro for some gnarly helmet cam footage and wind noise. 

Two problems have arisen since riding this thing;

One, it is wayyyyy too rich. It is flooding the bike and wont start. I have adjusted the needle and running std main jet size, so the mid range and WOT feels okay, but it will not idle. The pilot jet is sadly mashed in there and seized, not even an ezy out could extract it. going to have to drill it out and tap the thread again, so need to track down a tap for the appropriate thread pitch. Then will smash std size pilot in and start tuning from scratch.

Two, the clutch slips. Well, not really slips, but the disengage is very delayed, you change gear and about 5 seconds later the clutch releases and finds the intended gear. ugh, cases have to come apart again. So last night i pulled motor apart and the clutch plates looked okay, hard to tell if worn but they were pretty thin at 2.5mm. No worries i thought, i'll just swap the plates out from my low kms replacement motor.

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yeeeeea im probably gonna go ahead and not use those....

So this is where i am. now waiting for a clutch birthday parcel - springs and friction plates from Yambits. Bout a week turnaround for shipping. 

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But i have made progress where it counts, with the installation of the world's most vital and MUST-HAVE ADV accessory - the Aliexpress dart pouch, the PPSC weapon of choice for securing your Winny Blues on long rides. 

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Check your clutch cable too, gummy ones can cause slow engagement.
I had to do my restricted test with a sticky cable, made it interesting 

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21 hours ago, kicker said:

Check your clutch cable too, gummy ones can cause slow engagement.
I had to do my restricted test with a sticky cable, made it interesting 

yea brand spanking clutch cable which ive made plenty of adjustments to. What ive noticed is with the bars being very low, my cables like to kink up behind the headlight and along the frame. need to swap out for some higher rise ones which may help as well.

11 minutes ago, Truenotch said:

Clutch springs should help a lot. I upgraded the FS1 to use MX100 springs and the slip has finally gone away.

yep though i may as well replace em, may smash a couple washers in there as well for max tightness.

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More joyous progress on this thing. I got me new clutch pads and springs. The new springs were considerably tighter than the existing ones, they definitely helped a lot. 

There's a lot of conflicting home-mechanic information on the internet about installing clutch pads, and how long you should soak them in oil for. Some suggest an hour, some a day, and a few "ex-GP" mechanics recommend months. I am impatient and soaked them for an hour. 
It feels great now, best clutch i've ever felt on a bike so i call that a win. The first couple of mangs it did slip a small amount, but once motor got some heat into it the clutch has felt fine and no further issues. Will be interesting to see how long it lasts. 

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Carb now has standard size pilot jet in it and idles nicely. Still a little rich, but ok for now. Just need to get some miles on it. A lot of faffing around has gone into making it run nicely, i had to make a frankenstein throttle cable out of four, then had a local bike mechanic shorten the upper cable as it was too shlong.
With a smooth throttle cable, new front brake and new clutch it feels like i just bought this thing off the show room floor!

I just need a mirror and to get both brake switches to work and i am ready to pay a visit to the re-vin man. Much excitement. 

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also spotted this wild as fuck RX125 at the DGR in Wellington - sounds just as wild as it looks. Some inspiration for further down the track...

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