Grubee Solves Lighting Problem!

Discussion in 'Spare Parts & Tools' started by Mike St, Sep 5, 2009.

  1. Mike St

    Mike St Member

    I just noticed the China Gas site has a HS engine equipped with a 7 amp generator. Does anyone know about this and who carries it in the US? Also
    I am wondering if it is available with the 4G belt drive. Does anyone have info about these new developments. I'd say it's much cheaper than my solution for lighting, which also produced about 7 amps. These are very exciting developments and long overdo.

  2. jimraysr

    jimraysr Member

    GruBee 4 stroke wt. Generator / belt drive

    Unfortunally they only include two generating cols, no regulator or rectifier pack and the engine is 2" wider.

    They have the belt drives down in AU and they don't seem to be very impressed with them. The drive sprocket hangs way out of the case with no support. Likewise the assembly adds a lot to the width of the engine / transmission. Again it would appear the testing was done on paper and not in the real world. Too bad as when these things come out and have major engineering flaws, it would appear the supplier feels he has to sell enough of them to pay for his tooling changes.

    Good luck with your project, you may come up with an answer before the gentle giant?

    Last edited: Sep 6, 2009
  3. fetor56

    fetor56 Guest

    Grubee hasn't solved anything....another incomplete,ill-conceived mess.
    I pity the ppl that don't consult forums & buy this stuff in good faith,only to find it's unworkable;doesn't help the MB cause.
    Last edited by a moderator: Sep 6, 2009
  4. arceeguy

    arceeguy Active Member


    with lighting, you don't need a regulator or rectifier. Incandescent bulbs run fine on AC. Regulation isn't a big deal either. It is normal for lighting on small motorcycles and dirt bikes to vary somewhat with engine RPM.

    As far as the so-called review of the Grubee G4 goes, you have to take into account who the reviewer is. He is a guy who really can't say anything nice about anything made in China, and freely admits his hatred for things produced there. So when he posted his "review", it was about as predictable as a Scooby Doo cartoon.

    It is unfortunate that others repeat his opinions without first hand knowledge of the product.

    I'll reserve my opinion for when I actually ride one.
  5. fetor56

    fetor56 Guest

    Irish John doesn't change physics....if an engine + tranny are 11.5" wide then their 11.5" wide.
    Add to that another 2" for incomplete electrics & that's 13.5".....astounding concidering HT's are 4.75".

    IJ's Review Quote:
    "The G4 plus engine is 11.5" wide from outer edge of pull starter to outer edge of gearbox case (i.e external overall width) as opposed to the old Grubee gearbox rigs which are 9".
    That extra 2.5" makes all the difference in the world"

    So now instead of being 2.5" wider it has the potential to be 4.5" wider than any previous version.....and i thought the G2's/G3's were already too wide.
  6. arceeguy

    arceeguy Active Member

    "incomplete electrics"? It is absolutely NORMAL for a utility engine to have a lighting coil or alternator coil without an integrated rectifier or regulator. Remember, these are utility engines adapted to use on a bicycle. HT's are narrow because they are two strokes (much simpler) and purpose built for bicycle duty with integrated mounting bosses and integrated gearbox/clutch.

    Also, I was not questioning his measurements, but his opinions:

    How do you expect an unbiased, honest review of a product built in China when the author has these opinions.
  7. Mike St

    Mike St Member

    My solution also widened the engine on the recoil side a little, but the pedals still moved freely by the engine. It depends on how wide the mods make the engine, if the pedals can pass by it's ok, and if not a larger pedal crank could be used. It doesn't seem to be a serious problem. I'd say there seems to be a lot of prejudging here without a lot of
    seeing and testing.
  8. Mike St

    Mike St Member

    I don't know: I've been reading more about the 4G belt drive. If it's too wide on the drive side and can't match up with the wheel sprocket, it's a real problem.
  9. jimraysr

    jimraysr Member

    4g And Alternator Output

    Actually I have never seen Utility Engines with lighting output. Motorcycles, yes, but as any biker knows, they regulate the voltage with the load of the two bulbs and when one goes, the other is soon to follow.

    Alternator coils are generally there to charge a battery for a starter?

    This thread is duplicating part of an other thread going at the same time.

    They moved the ignition coil out from under the flywheel, rather than re engineer the engine to make space for the "lighting" / charging coil like you see on Honda and other engines. That makes the 2" addition to the width totally unnecessary in my opinion.

    I can see clearly from the pictures of the 4G that the output sprocket is hanging out so far in space without support that it will need a shuttle mission to service it. )

    What John says about China is probably well earned by them. I really doubt that anyone who has built a bike with a China kit will vouch for their quality. I only have two parts on my bike that I trust, The Honda engine and the Manic Sprocket adapter and the sprocket. Every thing else has or will fail. My first sprocket with the rag drive was out by a good 1/4" on sprocket teeth alignment. Likewise the 9 bolt holes were not centered with the tooth circle. The nine bolts for the sprocket began to fail right away and had to be replaced with Home Depot ones. Then how long can I trust the idler wheel and its mount? Many who don't want to trust in chance lock the mount into the chain stay to keep it out of the spokes. Yes, quality all the way. China is an example of stolen technology gone wild.

    Forgot one other major QC problem. The keyway for the clutch of the GruBee gear box was not the same as the keyway in the idler bushing. I bought and other gearbox complete for $80 and it was the same way. Finally Bicycle-Engine got some clutches and $20 later I had a clutch with the proper keyway. So now I have and extra transmission and two clutches to broach wider keyways.

    The engine mounts are now 5/16"-18 and have muffler clamp retainers.

    So if you feel I am being unfair, I am here to listen with an open, but experienced mind.

    Last edited: Sep 6, 2009
  10. arceeguy

    arceeguy Active Member

    Some snow thrower engines, kart engines and lawn mower engines have a lighting coil to power headlights.

    Even those with "alternator" windings often use just a rectifier with no regulator. The lead acid battery serves as the voltage stabilizer in the system.

    My point about Irish John is that there is no way he is going to give a fair review to a piece of equipment that he has already deemed "crud" because of the country of origin.
  11. jimraysr

    jimraysr Member

    Snow Blowers Lights

    Thanks for the update on lighing coil usage. I totally forgot my snow blower has headlights. They really help on those near zero mornings we have here in Phoenix and I have to clear the walk and drive from the 6' drifts and plows discharge covering all the cars down the street. )

    That is an exageration. the drifts were only 4' and the temperature about 80.

  12. fetor56

    fetor56 Guest

    It's going to be interesting when u guys get your 4G's & try to mount the setup....even more interesting if someone tries it with lights.
    I trust Irish Johns setup opinion but i'de still rather a 2nd/3rd opinion,just to confirm what's already been said.
  13. arceeguy

    arceeguy Active Member

    Jim - did I say that I expected you to know that snow thrower engines can have lighting coils? I don't think I did, so I am puzzled at your sarcastic comments. Maybe you've been out in the sun too long? :)
  14. jimraysr

    jimraysr Member

    Judt Joking!!


    The comment about being updated was serious. Obviously having lived in Phoenix from 1942 only gave a short time prior to experience snow and ice in IL and MO. I don't think they had anything but show shovels back then?

    The snow drifts and zero temps in Phoenix was an attempt at humor. I know that sarcasm is the poorest form of wit, but it is all I have. )

    Nothing aimed at you.

    This whole discussion is based on each persons experience, so combined we can all walk away with a broader view of the subject.


    Last edited: Sep 7, 2009