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1981 Honda C70 Passport bought today!

Discussion in 'Battle Scooters' started by txsizzler, Jan 19, 2013.

  1. windburn

    windburn Long timer

    Sep 30, 2007
    The Willamette Valley, Oregon
    There was a YouTube presentation about the 10 best motorcycles ever made you have just bought # 1. 60+ million people can't be wrong. However the real reason is that they are simple and reliable.
  2. snakebit

    snakebit growing old disgracefully

    Apr 11, 2007
    Sunny Sarasota FL
    I tried e bay and couldn't find that basket. I'd like one for my Symba. Do you have any information on the seller?

    Thank you.
  3. PTC

    PTC Turd polisher

    Nov 20, 2008
    masshole mofo
    fast foward a few minutes if your impatient like me. good stuff
  4. XJRetrofighter

    XJRetrofighter I ride them all

    Sep 23, 2009
    Seattle, WA
    I love Passports so much. One of these days one will follow me home too.
  5. klx250sfguy

    klx250sfguy Long timer

    Jun 28, 2011
    I like that basket. Info on the seller would be helpful.

    Passports/Cubs are great bikes. I had a blue one too, an '83. It was in great shape, though not as nice as my '82. I sold it to a buddy of mine who plans to drop a 125 cc Lifan engine into it. I might do the same some day but feel torn about doing this.

    I have owned a lot of bikes over the years but none have meant more to me than my Passport. It's a strange addiction of sorts.
  6. Woodsrat

    Woodsrat Gone ridin'

    Apr 27, 2006
    It's weird how bikes Honda couldn't sell when they were available now have people looking in sheds for 'em.

    They are great bikes, though and I really enjoy riding my Lifan 125 powered unit.
  7. klx250sfguy

    klx250sfguy Long timer

    Jun 28, 2011
    I will be upgrading my Passport this spring if not sooner. All in, Woodsrat, what would you say your 125cc Lifan transformation cost ya? I have read that the 88cc bore kit, available thru Beatrice Cycle, is also worth considering. I am not interested in doing the work myself (due to time, space and issues of ineptitude) however I have a buddy, a marine engineer, who will do the work for me (or with me). Thoughts?
  8. Woodsrat

    Woodsrat Gone ridin'

    Apr 27, 2006
    The 88cc kit keeps the bike original looking and retains whatever electrical system that came on it (6 or 12v.).

    My '80 "Frankenport" was originally purchased off of eBay for .99 without a front wheel, seat, head, and various other parts. After finding out how well the semi-auto 125cc Lifans ran after dropping one in my street-legal XR-50 pit bike and riding 450 miles in two days on an annual dual-sport run held in the Hoosier N. F. I bought another one for the Passport. You can't beat the price--$258 to your door or $299 with a carb and electrics. I made my own simplified wiring harness using the one that came with the motor kit and adding to it to wire up a head and tail light. I use a $15 voltage regulator from Tucker Rocky and an $8 halogen tractor spotlight from Harbor Freight as a headlight with no battery in the system.

    The Lifan is wider than the Passport motor on the right side and requires either modifying the stock peg bracket or the purchase of a footpeg assembly from the guy selling the motors (under $30). The cylinder is longer on the Lifan than the Honda motor which in turns moves the exhaust forward around 1/4" or so. To make it run well you really need a pipe that flows better than the stock Passport exhaust. I'm using a CRF-70 high pipe with no spark arrestor screen. A vendor on eBay called classicscooterparts sells a head pipe that would be an excellent start for a free breathing low pipe--just add some sort of large volume muffler to it.

    If you already own a 12v. Passport I'd go with the Lifan. If you own a 6v. unit and can live with that electrical setup then go with an 88cc kit. They make a huge difference and are as reliable as stock. I ran one for years in a CRF-70 motor in all kinds of use and abuse and it's still running as well as the day I put it together. For reference I used the Honda Trail Bikes 88cc kit which came with a carb but I never could get it to jet up right and ended up using a rejetted stock CRF-70 carb. These bolt right up to the stock Passport intake/air cleaner tube. Modifying the airbox to flow more air (drilling it full of holes?) would probably help a bunch.

    On the Lifan you just run a pod style filter. Currently I'm running a K & N only because I got tired of the legs of my jeans getting oily from foam filters.

    I'm running a throttle assembly from a BBR XR/CRF-50 handlebar kit and bars from some mini-moto bike on the Lifan/Passport with a home-made bar mount setup that bolts in where the stock Passport bars bolted in. I'm not sure what you could do to adapt this carb to the stock 70 setup--maybe a custom cable from Motion Pro?

    If you went with an 88cc kit and a CRF-70 carb the stock Passport throttle cable, etc. MIGHT work.

    The biggest gain the Lifan has over an 88cc modded Passport motor is the additional cog in the gearbox which makes a huge difference. Running a 14/36 combo my Lifan/Passport will hit sixty MPH yet still has plenty of zoom around town. Adding a four speed gearbox to the Passport can be done with an aftermarket kit but that's more $$$.

    Hope this helps...
  9. klx250sfguy

    klx250sfguy Long timer

    Jun 28, 2011

    Helps a lot. You're a wealth of info. A buddy of mine bought an '83 Passport off me. I think I will see how it goes with his Lifan transplant. He might encourage me to do the same (mine is a 12V btw). I'm in no rush though. Either option sounds to be relatively inexpensive. The extra cog appeals to me, so does the extra oomph. Is yours set up with a semi-auto transmission or full on manual-shift? I'd prefer a manual.

    Thanks for your help.
  10. Woodsrat

    Woodsrat Gone ridin'

    Apr 27, 2006
    Mine are all semi-auto bikes. A manual clutch motor is cheaper to buy on eBay although you can go crazy and buy one of the KLX/Honda clone 160cc hybrids that can be built up over 180cc. That would make for an interesting C70...:eek1

    Personally I prefer the autoclutch for the basic 125 motors, though. Simpler (no clutch cable or lever to mess with) and especially on a Passport it greatly speeds up the conversion. Hanging a clutch lever on a stock Passport is going to require some fab work with the stock bars. Unless you're going to drag race or whatever I think you'll find the autoclutch is the way to go.

    I'd rather have the "complication" of an oil cooler (two lines and an adapter plate) if I had a choice. Especially in hot weather this is a good thing.

    Good to hear you've already got a 12v. bike. I'd like to find a good one and do a big motor conversion on it, making it look as stock as possible. Unfortunately most of the junquers I come across are 6v. models.
  11. klx250sfguy

    klx250sfguy Long timer

    Jun 28, 2011
    I find winter is such a bummer. It kills me to have two bikes in my garage just sitting there.

    Looking forward to the changes I'll be making to my C70. One gripe about my bike is the strap on the seat, the metal part digs into me. It is easily removed but doesn't look as good. Looks vs comfort, that the dilemma.

    Can't wait for spring. Newfoundland is about to get blasted today by yet another winter storm.
  12. YamaGeek

    YamaGeek Ancient trailbike padwan

    Jun 24, 2007
    western oregon
    My '68 Cub 125cc conversion uses a manual clutched long stroke engine, the clutch release pull is negligible, enough so that a short, sturdy BMX Bicycle brake lever works fine. removed the old grip and used an NOS Oakley BMX grip cut slightly shorter. Very smooth engagement even with the shorter lever.

    I find it's also a lot easier to pull the clutch in to coast for hyper-mileaging on down hills and approaching stop signs. As much as I have liked the semi auto's I've owned in the past, having a manual clutch is a bit more intuitive in traffic and it just seems to shift faster.
  13. txsizzler

    txsizzler n00b

    May 29, 2011
    S. Texas next to Corpus Christi
    Just wanted to give everyone an update on my project. If you recall, I was going
    to clean the gas tank (lots, and LOTS of rust in there, come to find out!!!),
    and do some other things. Well, here is a laundry list of whats been done thus

    - Removed the fuel tank, and did a Evapo-Rust treatment, and lined it with Red
    Kote. Here is the procedure I followed:

    Evapo-Rust part

    - plug petcock holes
    - fill with Evapo-Rust (close to a gallon)
    - Shake vigorously every few minutes for 30 min.
    - Let product settle for overnight, dump out in the morning
    - Remove plug from petcock holes, empty and shake out as much as possible.Blow
    out inside tank with shopvac hose

    Simple Green part

    - plug petcock holes
    - Mix some Simple Green with water, fill the tank
    - Shake vigorously every couple min for about 10-15 min.
    - Remove petcock plugs
    - Run cold water w/water hose until no suds are seen and line is clear
    - Empty the tank, use ShopVac hose to suck out all the water
    - Plug lines, pour a pint of Acetone into tank, shake vigorously
    - Drain out Acetone, repeat Acetone procedure, remove as much Acetone
    as possible.
    - Unplug petcock holes, leave tank outside to dry

    Red Kote part

    - Plug petcock holes, and AROUND the fuel lid
    - Using a funnel, pour the entire quart into the tank
    - Tape fuel lid hole closed. DO NOT USE THE FUEL CAP
    - Following the instructions on the Red Kote can:
    - Rock slowly back and forth, up and down for about 30 min to get entire inside
    - Product should start moving slower inside
    - Once it starts congealing, remove tape from fuel lid and petcock holes, and
    let product drain out through petcock holes back into Red Kote can
    - Make sure all excess product is out. Might have to rock back and forth, and
    let it sit on the can
    - After about an hour or so of this, and all excess product is out, put on
    cardboard and leave out in the sun to cure
    - Curing is 8-24 hours. Wait then a couple days to put fuel in. Should have a
    nice, red surface across all areas of the inside tank


    Worked GREAT! After letting it sit for about 24 hours, I checked it, and it has
    a nice, red lining inside. Should really protect against the elements! Bought
    both the Evapo-Rust and Red Kote at O'Reilly's. Spent about $35.

    Here is more things I have done:

    - Replaced fuel lines with 6mm (1/4" fitting) clear Motion Pro lines (bought
    from Bike Bandit)
    - Replaced spark plug, although the old NGK one still looks good, so saving it
    as a spare.
    - Replaced petcock with aftermarket one from eBay
    - Checked the points, still look like NEW (the cap hadn't ever been taken off,
    from what I am guessing.. almost lost the gasket, as it was stuck pretty good to
    its mounting point)
    - Checked air filter, still looks pretty darned clean
    - Bought a new battery, filled with acid last night, had it sitting on a 6V
    (2amp) charge cycle for about 10 hours (I found out later that this was too strong of an amp to
    be charging with.. it shows 6.4v when the bike is off, and it not being connected to the posts.
    With posts connected, its at 6.2v, and after riding around for a bit, it showed 14.3v????; its a WPS battery)
    - Drained the float bowl. Will carb clean if needed. Will be running some
    SeaFoam through it with the fuel.

    Here in the next couple of months, I will be stripping the paint off the bike,
    and repainting it. Haven't decided on a color yet.

    I was able to ride around some after having to kick start it for awhile. No fuel in the carb, and had to get it in
    there! Then it ran like a champ, although the idle speed is too high.

    Anyhow, sorry if this was too long of a read! I hope others can get some good
    info out of it, though! I will update more as I get more things done to it.

  14. motogirl25

    motogirl25 Been here awhile

    Apr 24, 2013
    Savannah, GA
    We are fixing up our 81 Passport right now and I saw this thread. We are looking for a throttle cable for ours... I read on a site that it was discontinued?? Where can I get one or is there another Honda cable that will work? Just wondering if you ran into this issue.