harbor freight bmp

Discussion in 'Introduce Yourself' started by berdss, Oct 21, 2009.

  1. berdss

    berdss New Member

    I was reading that someone tried to use a harbor freight water pump engine with a BMP friction drive. I did not see the end as to weather or not it worked and what was required to make it work. If anyone has this info I would greatly appreitiate any help as I would like to get one. THANX
     

  2. machiasmort

    machiasmort Active Member

    Best of my understanding is HF engines need to have a variable carb on then because the are set up to be self governed w/o throttle control...

    I guess you have to get a different carb for them to work?
     
  3. berdss

    berdss New Member

    I did not recall anyone saying anything about the carb also being a problem. THANX Did you see any of the other quetions answered too?
     
  4. fetor56

    fetor56 Guest

    G'day & welcome to MBc.
    The problem is with the clutch.If u get the engine with water pump u need to seperately buy the clutch pack...if u buy the engine with auger bit the clutch pack is included.The pack itself is only relatively cheap & HF also sells that.
    Porkchop is the member to PM about all this.
    http://www.motoredbikes.com/member.php?u=7760
     
  5. Porkchop

    Porkchop Member

    I just happened to run across this. Yes, the water pump engine will work with very minimal upgrade. Less than $10.00 in parts. I read something about the carb not working. That's not true in my case. No problems. Also, the pump has been discontinued. I still see them on the shelf in my local store. I'm sure it's left over stock. This kit is way cheaper than purchasing the auger, which is where my first engine came from. I had the auger for about 2 years before I got nto motored bikes. I didn't buy it just for the engine. There are places where you can get the same engine with the clutch already installed for about $120.00. Get in touch if you're still interested and need info.
     
    Last edited: Apr 9, 2010
  6. andyszyd

    andyszyd Member

    Yes, very powerful engine, propely broken in will rev and pull heavy a** at 9000 RPM WOW !!! works great with BMP kit but you need a clutch.

    If you buy it from other sources than HF make sure you have warranty or return option, some people on this board were burned by
    a vendor selling those "new" "as is" and some of them turned to be a dude.

    Then you are screwed.
     
  7. Porkchop

    Porkchop Member

    The clutch is a standard 76mm or 78mm, whatever, I don't remember the exact. But it is a standard 2 shoe centrifugal clutch. There are many, many vendors that sell them. eBay is covered with them. You can probably buy them at local lawn and garden equipment stores, Northern Tool or where ever. There's nothing sacred about the clutches. Standard stuff. They're cheap, like $2.50 at Harbor Freight with maybe 4 or 5 dollars shipping, but they're shipping takes about 6-8 weeks. Andy in the previous reply is right about a powerful engine. At least they are for something as small as they are. My total weight, myself and bike combined is about 280-300 ppounds. no problem even pulling moderate hills. My Harbor Freight 50cc will outperform my Honda GX35 in all aspects. Go figure !
     
    Last edited: Apr 9, 2010
  8. Tanaka40

    Tanaka40 Member

    Porkchop, The Honda is 4 stroke and the HF engine is 2 stroke. Typically you can get more Horse Power from a 2 stroke per cc. I was working for a machine shop that ported Yamaha KT100 motors for go cart racers, they got 34 HP out of that motor on the dyno !!! imagine that on you motor bike !!
     
  9. Porkchop

    Porkchop Member

    I know and agree. But there's also a saying "There's no replacement for cubic inch displacement". The HF engine has about .6 more horsepower than the Honda. That's a big deal when we're talking about 1-3 horse power engines to start with. Not knockng Honda. I'm sure they're good engine and will probably outlast my China engine by a long shot. Sometimes I just like expressing what I know first hand to maybe help others with making their decesions. As far as 34 hp on a bicycle, FORGET IT ! I like living to much ! Fastest I've had my bike is 32 mph. That's to fast for my bike. It gets very unstable.
     
  10. Tanaka40

    Tanaka40 Member

    Imagine 34 HP and speeds reaching 75 MPH and 2 inches separating your backside from asphalt on a racing cart. What a rush.... maybe to the hospital if you crash !!! LOL
    Seriously you are correct, fractions of a horsepower make a huge difference in our hobby. (and since we are limited with 50CC's and 2 HP (most states) anything less is very noticeable)
    i love the power of my motor and the power upgrade options that are available. (according to what website you look at, I am already near or over 2 hp limit)
     
    Last edited: Apr 10, 2010
  11. Porkchop

    Porkchop Member

    What engine are you using ? Tanaka by chance ?
     
  12. Porkchop

    Porkchop Member

    We're getting off topic on someone else's post here !
     
  13. Tanaka40

    Tanaka40 Member

    berdss Are you trying to put a bike together cheaply or something you will use everyday for alternate transportation. The chinese engines like the ones at Monster scooter (with electric start for $129) or the Hua Sheng 142-f-gen (has a generator built in) would be nice choice for a good cheap engine. If you are going to use this as primary transportation, then you might want to look at the Tanaka 40cc 2-stroke or some other well made Japanese engine. (and yes I have a Tanaka PF-4000 40cc engine that's a blast, Thanks Porkchop ! LOL)
     
  14. berdss

    berdss New Member

    What size spacers and bolts did you use with the waterpump engine? Also was it a problem that the clutches don't stick out as much?
     
  15. berdss

    berdss New Member

    I bought the waterpump engine and bought the clutch parts. Do I have to put thread lock on the clutch screws?
     
  16. andyszyd

    andyszyd Member

    I surely would.
     
  17. Porkchop

    Porkchop Member

    Spacer and Bolt Length

    Don't listen to Andy ! He knows nothing ! Hee ! Hee ! Just poking fun at him. He's one of my buddies. My auger engine did not have thread locker on them and they still don't. I'm sure it wouldn't hurt though. As far as what size spacers and bolt length, (the one used for connecting the engine to the channel) I don't remember exactly, but I'm pretty sure they were all 5mm shorter than what comes with BMP's kit. There's just a little bit of difference between the engine that comes on their pump vs. the auger. If you use the bolts that come standard with BMP's kit, they will end up hitting the fly wheel. I don't remember the spacers, but probably the same scenario. You need only 4 bolts and spacers. They're pretty cheap at Lowe's. I don't have the pump engine anymore, so I can't check all that stuff for exact dimensions. I do know it was an easy and inexpensive conversion. No way would I buy the auger for the price just for the engine. You can get the same engine from various vendors with the clutch already installed for about $130.00. If you go to BMP's web site and click on the engine info option, there is a least one vendor there that sells them. It's monster scooter. I thin the spacers that come with BMP's kit are 40mm in length. I'm pretty sure I used 35mm. Pay attention to the clutch. You want to get the clutch as far into the clutch drum as possible without it bottoming out. The auger engine was a direct bolt on. however I discovered only about 1/3 or 1/2 of the clutch was actually going into the drum. I ended up using shorter spacers and bolts just to get a little more clutch surface into the drum. Should give me a little longer lasting clutch. But then again, clutches are cheap, the mounting hardware is cheap. Tinker with it and make your best decision as far as what length bolts and spacer you want to use. I also think the pull starters are a weak link with these engines. They're less than $5.00 from HF and shipping is cheap too, but again, 6-8 weeks for shipping. I ordered 3 extra clutches and 4 extra pull starters. I found that the hard way and didn't ride with that engine for 8 weeks. Used my Honda GX35. Was glad to get my cheap China engine back due to the difference in the power. Anyway, I hope I made sense here. don't be scared. It's a simple task and inexpensive. If you need more help, get back in touch.
     
  18. happycheapskate

    happycheapskate Active Member

    I am interested in this engine (Harbor Freight 50cc) and the Bike Motor Parts roller drive kit.
    Will it work on a "10 speed" road bicycle with 27" tires (the raised center type or the good Cheng Shen cheapos) or fat 700c "touring" tires (Nashbar specials)? I want a light bike that is easy to store and that I can actually pedal 20mi if something goes wrong with the engine one day.
     
  19. Porkchop

    Porkchop Member

    Probably so ! Look at BMP’s web site to determine for sure or not. They also have a few videos on you tube. You’ll have to search for them yourself. I don’t remember them per say. They shouldn’t be to hard to find. Give BMP a call. The man that owns, and /or operates the business is named James. He’s always seemed to have time for me. Everyone I know that has dealt with him has said the same thing about him. As far as the tire size you mentioned, I’m sure they’re kit would work, but those sizes are not ideal. The wider, smoother and flatter the tread pattern, the better grip (friction) you’ll get between the roller and the tire along with a longer lasting tire life. Also those skinny tires don’t make for a good, smooth ride. You can disengage the drive roller from the tire so you have no resistance while peddling. Just the extra 10 or 15 pounds or so added to your bike. Also, check the following link. You can get the same engine there for about $120.00 with the clutch already installed. As I said earlier in a previous post, you can get the same engines that come on the Harbor Freight pumps and augers from several different places. I think there might be more than one listed on BMP’s web site. You’ll have to look and see. Also another little note, one of my friends bought this engine from monsterscooter. Seems to me it does NOT come with a fuel tank. If that's the case, then a tank will probably be another 15 to 25 dollars. Be careful. If that's the case, then I'd definitely opt for the Harbor Freight water pump and deal with the clutch issue myself for the difference in money and the ease of installing the clutch it's self, if I could find one and find it when they're on sale for about $100.00. That pump, I understand has been discontinued. My local store still gets a few in here and there. I'm sure they're getting new old stock from their warehouse, and when they're gone, there'll be no more. Not from HF at least ! However there are several Japanese engines that will work, but there going to cost a bit more. But in the long run should last a good bit longer as well.

    http://www.monsterscooterparts.com/49enwimapust.html
     
    Last edited: Apr 12, 2010
  20. Tanaka40

    Tanaka40 Member

    Humm..... didn't I mention MonsterScooterParts ???? (LOL)
     
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