Grubee 66cc in a Schwinn Alloy Three Cruiser

Discussion in 'Photos & Bicycle Builds' started by Irish John, Mar 7, 2010.

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  1. Irish John

    Irish John Guest

    I have started making 2-strokes again because the Grubee ones are pretty good. This one is a 66cc Grubee Skyhawk in a Schwinn Alloy with Nexus 3spd hub. The Nexus 3 spd hub has a spoke flange that just allows ( the clearance is about 0.02mm) the standard sprocket clamp to fit it but the centre hole has to be drilled out for it to fit. Fortunately my 54mm drill leaves me some play so I can get the sprocket aligned to minimise up & down movement of the sprocket teeth.
    BTW has anyone ever been able to mount a sprocket so there is absolutely no variance in chain taughness/slackness when the wheel is turned through one revolution? I haven't ever managed that on either a motor chain sprocket or a pedal chain because the chainrings are never perfectly round, I found that out when I scanned a few and imported the images into AutoCAD and tried drawing circles around the teeth.
    This 2009 model Schwinn has a really beautiful metallic paint job as well as great looking welds. The frame colour is metallic light teal & dark teal and I got the tank colour computer matched by flattening the bit of fender I cut away and feeding it into the colour analysis computer. It's not quite right but next time I'll darken it a bit and get it perfect. I use high density foam strip that has adhesive on one side and fits beautifully into the channel on underside of tank. This lets me tighten it securely without over-stressing the tank holding studs. Works great on curved top tubes like on a cruiser. Also use M3 bolts and locnuts on chain guard and fenders because those always vibrate loose and break their brackets without secure fixings.
    I've noticed that this 66cc drinks fuel - I used about 2.5 litres of mixture over 60 kms which is pretty terrible. I hope it improves as the motor wears in. Anyone know why this might be?
    I never thought I would use the 2-strokes again after my terrible experiences with ZBox ones but the Grubee guy offers me a 3 month warranty and they seem to have corrected a lot of things using M8 studs for cylinder & head with nuts that don't loosen. Also larger exhaust studs and pretty good chains.
    You need to be pretty strong to pull the clutches in on these new motors but that might ease a bit over time.
    Schwinn have discontinued all their classic Californian Cantilever Cruiser Frames for 2010 except the all steel Deluxe 7spd and that makes things very difficult for me cos the alloy ones are the perfect host for the 4-strokes and very good hosts for the 2-stroke. I like how they come with steel fenders and a great saddle and those tapered steel forks are actually very twangy and great on bumps. This years Schwinns have flat box steel forks (blade forks they call them) that are nowhere near as good and are totally rigid with no play at all. The top tubes won't fit a tank either cos they are like the Nirve cruiser and they have silly bottle holders and stuff on them that make motorising almost impossible. I don't think the makers ride these bikes much. I like the Alloy Schwinns much more than the big steel D7 even though the D7 looks spectacular. With a suspended saddle post the rigid alloy is every bit as comfy as the steel with springer forks and they are so much lighter. In hindsight I think a 700C wheel gives a much better ride on a 2-stroke and you can cruise faster at lower revs but they cost more cos you have to buy saddle and fenders.
    Here are some pics of the build. I had to use Map Gas on the exhaust to bend it quite a bit and that discoloured it but no great harm done.

    Attached Files:

    Last edited by a moderator: Mar 7, 2010

  2. BeauBoy

    BeauBoy Member

    Looks awsome mate! :cool2:
  3. Irish John

    Irish John Guest

    Thanks Beau Boy - it needs a jackshaft kit now.
  4. tractorboy8420

    tractorboy8420 New Member


    DANG! she is a real beut! really sharp looking! love how she kinda flows with that motor and the paint job on the tank! looking good man!:cool:
  5. Irish John

    Irish John Guest

    The guy who bought it seems to have had trouble riding it - after 9 days it was seen lying around the local town for 5 days all bent and mangled with one of the panniers full of beer that was subsequently stolen. I try not to sell to serial ****-pots but I think this guy sneaked through the vetting procedure. I really regret building the bike for him cos all that effort was wasted on him. C'est la vie!
  6. give me vtec

    give me vtec Active Member

    let me get this straight... the idiot left the bike, AND THE BEER????????

    OK, I can understand crashing your motorized bike drunk while on a beer run. I can even understand leaving the bike and getting it in the morning w/the truck (if you live in a small enough town that isn't a problem).

  7. Irish John

    Irish John Guest

    Good deduction Vtec....I had the same mental process myself and the only and immediate conclusion was that he was apprehended by the men in blue and chucked into the paddywagon! The local winos took 4 days to make up their minds to nick the pannier with the beer in it but why they nicked the pannier as well I can't figure out. He asked me to order him another drive sprocket cos he wasn't happy with the one I'd installed and tried to grind down to fit (but they are all slightly ill-fitting) so I'm a bit out of pocket which makes me a suspect for the pannier theft I suppose.
  8. graucho

    graucho Active Member

    John... very sweet ride you have there. (like all of your bikes.) Once again, great job!
  9. give me vtec

    give me vtec Active Member

    sounds good... only one question, is it customary for your local PD to leave unattended alcohol where minors could possibly stumble upon a "free drink".

    I like your bike though... I am going to buy a HS 4 stroke kit for my Schwinn jaguar. Should be fun.
  10. Irish John

    Irish John Guest

    Thanks Graucho. How's that chopper of yours these days?
  11. Irish John

    Irish John Guest

    If you can afford the Honda VTec I'd go for that cos the difference is pretty noticeable. In Aus the price difference is horrendous between the HS & Honda but you guys can get a Honda GXH50 for 40% our price at Small Engines Warehouse. The HS is a great motor too but it's a bit slow cos it revs to lower rpm and I suspect it's power output is considerably less than the Honda. I can't remember reading anything bad about the HS on this Forum. I shelled out $287 on my Brooks saddle but in ten years time I doubt I'll still be fretting over the price - it is so comfy on long rides. Likewise with the Honda.
    BTW I doubt the cops knew about the contents of his pannier - if they did they wouldn't have left the grog in it. Kids don't drink beer these days they drink alcopops laced with spirits - yuck!
    A cowboy appeared before St. Peter at the Pearly Gates. “Have you ever done anything of particular merit?” St. Peter asked. “Well, I can think of one thing,” the cowboy offered. “On a trip to the Black Hills out in South Dakota , I came upon a gang of bikers, who were threatening a young woman. I directed them to leave her alone, but they wouldn’t listen.

    So, I approached the largest and most heavily tattooed biker and smacked him in his face ... Kicked his bike over, ripped out his nose ring, and threw it on the ground. I yelled, “Now, back off or I’ll flog the lot of you!”
    St. Peter was impressed, “When did this happen?”

    “Just a couple of minutes ago.”
    Last edited by a moderator: Apr 13, 2010
  12. NoPed

    NoPed Member

    Ok Mate; i may be sold on the "2009" Schwinn if i can find one and since it accommodates the big honda motor. Now what's all this about a "jackshaft"? i know it transfers power to the other side so would you hook your chain from that sprocket to the regular bicycle sprocket and then be able to use the b

    still learning,
  13. Irish John

    Irish John Guest

    NoPed take a look at MotoMagz bike on
    cos it is a Schwinn Jaguar (not available outside of USA) and unbelievably for a US cruiser bike, it has a front V-brake on a springer fork and it has a rear V-brake as well which eliminates the cursed coaster brake for toddlers and octogenarians. I know it has no fenders but you can choose lovely silver plastic ones with s'steel stays and a really good quality alloy rear rack like the ones on my Alloy Schwinns and I think you will have the perfect bike.
    The shifter kit goes from the right side to another chainring on inside of main chainring on the crank & then by pedal chain to the back as per normal to the rear derailleur. MotoMagz swapped the cheap derailleur for an expensive one.
    I have never used the shifter kit but would love to try it out. You need an old style Mark2 or Mark3 Grubee gearbox though & not the 4G.
    Don't know if the Schwinn Jag is steel or alloy frame.
  14. Irish John

    Irish John Guest

    Sorry, CORRECTION, the springer & V-barke on the Jag were aftermarket parts.
  15. tractorboy8420

    tractorboy8420 New Member

    that just plain sucks! i cant beleve people! its realy ******* anoying that people have to be so dang stupid... sorry for your loss mate, that must have hurt you more than him... considering he was drunk off his *** ...
  16. NoPed

    NoPed Member

  17. Tango911

    Tango911 New Member

    glad to know the grubee is decent , there are so many selling these engines i just didnt know what to get, so i went with it. So far so good.