1966 Yamaha YL1 "Roadrunner"

CDNbiker

Active Member
OK so here goes - I've got a very complete 66 Yamaha YL1 2-smoker 100 cc twin, with dual exhausts and carbs. And here is the storey behind how I acquired it, and where I plan to go with this project.
5 years ago my son (22 at the time) replied to an ad for an old Solex. When he went to look at the Solex, the 80 something year old owner says "I've got some other bikes in a trailer - want to have a look?" Crammed inside the 20 foot trailer were a bunch of bikes from the 60's, 70's, and 80's. Apparently the guy wanted to restore them someday, and as life went by he got too old and the wife told him to get rid of all his "crap". My son spotted the little YL1 under a ton of grease and dust. How much do you want for that one my son asked pointing to the YL1. "You can have it for 300 bucks" My cell phone rang shortly afterwards, my son asking if he could borrow 300. Yeah, sure I said. At least I had some collateral for the loan. Over the next 5 years, my son took the bike apart in his batchlor apartment, cleaned off the grease, and did some spray can painting. He rebuilt the top end of the engine, adding new pistons and rings. But he sort of lost interest and met the love of his life. (you know where this is going right?) Anyway, about a month ago he tells me he's getting married, and that he put the YL1 on Kijiji to get some cash. WHAT - how much?? I could not stand to let that thing go so I gave him his asking price immediately. Like I need another project - I'll be that 80 year old myself someday with a bunch of unfinished projects lol. So what to do with it? It's too rare and complete to chop up so changes will have to be reversible but I want to add my personal mark on this. And I always lusted after a 1969 Roadrunner. And although this bike is as far from a Roadrunner as you could get, there are a few things that are similar. Dual exhaust. Multiple carbs. Basic design. And a motor that has a nice sound. So there you have it. Here is the plan. Rebuild this bike as some sort of tribute to the Roadrunner without chopping it up. I dunno, did I smoke too much weed in the '70's or can I actually pull this off? Stay tuned.
 
Well first things first - I have to get this thing running. According to the guy my son bought this from, it was last run in 1981. The carbs were full of gas when it was run last. And if you are wondering what that does...well let's just say baby dinosaurs were growing in there. My son had cleaned most of the crap out of the carbs previously so I put some gas in the tank and filled the oil tank. (it's auto injection) Primed the oil lines to make sure the cylinders were getting some lube. Bought a new battery and installed that. About 10 kicks and she roared to life! Unbelievable - the motor felt strong and she wanted to ride. One small issue though - one carb was puking out gas like a drunken 16 year old. So a quick run up and down my street before the gas ignited was all we could do. Between the 2 stroke exhaust and the giant puddle of gasoline on my street - I was expecting a visit from the Ministry of the Environment, the Canadian equivalent of the EPA. Rolled it back into my garage and took off the puking carb for more work. I'll post some pics soon - just too lazy tonight
 
Some photos of what I am starting with.
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What a lovely little bike, I'll be watching this like a hawk as I love small Yamaha's

Please feel free to post it on yammy100.com - it's my little bit of the internet and the clue is in the title URL :)
 
TwinPlug said:
What a lovely little bike, I'll be watching this like a hawk as I love small Yamaha's

Please feel free to post it on yammy100.com - it's my little bit of the internet and the clue is in the title URL :)
Thanks! I'll have to check that site out.
 
There's nothing as nice as yours on there though, it's mainly RS/RXS and YB100's, but it would be great to have this on there.
 
So I removed the offending carb. It definitely is going to need a new bowl gasket, and the float setting seems way off too. My buddy who rides a bobber, is very conveniently a certified aircraft mechanic. He offered to take a look at it for me. He has rebuilt more aircraft carbs than I can count so I feel pretty confident he can get this one sorted.
 
Report back from my buddy is that the carbs got a lot of crud inside and are going to need a rebuild. Carb rebuild kits for a 66 are not something you can get at your local Yammy dealer. Found a NOS carb kit on e-Bay in Asia which is now on order. In the meantime, I received a NOS chain guard in the mail. Also an e-Bay Asia find. Not the fully enclosed one like mine has, but one that looks like a "normal" chain guard. The mounting holes seem to line up so I guess the bike had different chain guards for different markets. At any rate, the new one is much more in tune with my theme and will make the bike look much cleaner.
 
By the way, I have given some though to the Roadrunner theme, and just so I'm clear, I'm not trying to make the bike "look" like a Roadrunner. I want to apply some of the design process that Plymouth did to the Belvedere/Satellite in the 60's to modify it into the Roadrunner. If that's confusing, a picture is worth a 1000 words. Here then, is what I an NOT trying to do:
57ChevBike.jpg

Although it took a lot of time (and money) to create a bike that looks like a 57 Chevy, that's not my thing.
 
Well my carb float bowl gaskets FINALY shipped - on a UPS truck someplace between LA and Toronto. :( Todays mail contained a couple of NOS precut keys that match the numbers on the steering lock and ignition. I only have one ignition key (that no one has a blank for) and I don't have a steering lock key at all. I can hardly wait to get home and see if they actually work. I'll probably take off the old fully enclosed chain guard and see what is making all the racket that is coming out of there when you push the bike. Probably the chain hitting the inside someplace I hope. At any rate I'll put the replacement NOS chain guard on tonight.
 
Well both keys fit - too easy. Guess in 1966 before the Internet no one was worried about someone writing down the 4 digit numbers on the lock and ordering a key off e-Bay ;D
 
Well the good news today is that my NOS carb rebuild kit arrived from Asia. The bad news is that all the parts are slightly different than the originals (except the gasket) - at any rate, it was an excuse to walk to my buddy's (the aircraft mechanic) house with a few beers in hand and try and get the carb back together. I'm glad he was putting it together, not me; there was like a million little parts to go back together inside that thing. And although we checked the engine service manual, there were no specifications for the float height setting. So we relied on Mr Molson for guidance. So tomorrow I'll install it back on the bike and see if it stops leaking. Otherwise, we'll pull her apart again and screw with the float settings. This time though I'll try to start it in front of the guy next doors house while he is at work. He's a complete dick and if the Yammys going to puke gas again I rather it be in front of his place, not mine ;)
 
oldnbroken said:
Am looking forward to seeing what you do here, that is a lovely little bike.
Thanks - I'm looking forward to see what I do here too...I always go into things without a plan (more of an idea really) and just let the project lead me through it.
 
OK I'm beginning to think this bike has a personality or something and is screwing with me. I put the rebuilt carb on and fired her up. Ran like a top and no gas out of the rebuilt carb. But guess what? Now she's pouring gas out of the OTHER carb, the one that was fine before. WTF? ??? This thing is messing with my head. I know I rebuilt the leaking carb. Really. I took it off before the beers. Honest. I'm still waiting for UPS to deliver the other gasket I ordered (as a spare) so it will be put to use when it arrives. Guess I'm taking carb number two to my buddy's house. Gonna cost me more beers though...
 
OK folks, while we once again wait for a carb float bowl gasket, I need some feedback on the handlebars. As you can see from the photos at the beginning of this thread, we currently have some 1960's high handlebars that sort of remind me of my banana seat bicycle from 1970. So my possible choices are (in order of back pain): a) leave as is, b) drag bars, c) clubmans. There is also a possible d) option - something in between a) and b). Also keep in mind I really want to keep the stock brake and shifter setup. The other thing I have to consider is the very funky throttle cable that is a one into three way affair. Twist the throttle and two cables control the carbs and the third goes to the oil injector. I managed to find a NOS replacement on e-Bay, but creating a custom short version of this might be rather difficult. I think clubmans would look cool, but with the stock brake and shifter it would be a killer on the back and difficult to brake/shift. Or should I consider some sort of custom rearsets and go the clubman route? What would Plymouth have done? :-\
 
Major progress today. My second gasket arrived Friday night so I dropped off the carb at my friends house Saturday afternoon. He texted me this morning saying he stayed up late last night and rebuilt it at 3 AM. I just installed it and success! No leaks and she started on the second kick! I need to do some fine tuning on them but she sounds pretty sweet. Here is a link to a video of it running, first time since 1981.
http://www.youtube.com/watch?v=ilBB1R1BKCM&feature=youtube_gdata_player
 
Well been a little busy lately and have been travelling with work. So I have not had much time to fool with the bike. But last night I spent some time trying to get the carbs dialed in. I think they are pretty close, but I still need to bump the idle speed up a bit as she wants to stall when the choke is fully off. I then went out with a buddy celebrating his birthday. We got back, and drank some more beers in his garage. That was a mistake of course, as I feel like crap today. So, I got a late start this morning (afternoon actually) and took off the fully enclosed chain guards and found the source of the grinding sounds - the sheet metal was cutting into the rear wheel hub. Of course to get the old guard off I had to remove the rear shock while fighting off the aftershock of last nights activities. :-X At any rate I got it off and installed the one piece NOS one I got off eBay. I like the look a lot better and it weighs a fraction of the original fully enclosed affair. I'll post some before and after pics soon.
 
I was surfing on eBay tonite and found the solution to the problem of what bars to use. Actually, the bars on this bike have several holes and a slot on the throttle side so adapting anything will be a chore. But then, right there on eBay is someone selling a NOS Yamaha handlebar that looks like a drag bar. Designed for multiple Yamaha models from the 60's including the YL1. Holes and slots cut out just like I need. I'm guessing this was a 60's dealer option you could get for a cafe racer look. At $50.00 bucks it is perfect and has the exact "look" I want. I'm thinking it's my lucky day. Earlier tonight I got a call saying I won a draw for a $300.00 watch. Guess I should have bought a lotto to ticket too.
 
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