Huasheng 49cc vs. Honda GX35?

Discussion in '4-Stroke Engines' started by bikejock, Nov 16, 2015.

  1. bikejock

    bikejock Member

    Hey all, I'm thinking of doing an engine swap for a Honda GX35 to replace my Huasheng 49cc I got currently on my Staton Inc. FDR bike. Does anyone here have experience with both these engines? if so, what are the pros and cons between the two engines? I was thinking of doing this engine swap to reduce weight and improve reliability. I have the FDR kit using the largest drive roller they got so that should help with top speed even if I go down 14ccs in engine size.
     

  2. The_Aleman

    The_Aleman Active Member

    Well, both engines have somewhat similar power. I don't think a GX35 is much of an improvement in reliability, however. The Chinese Honda clones are very capable.

    The GX35 is more compact and lighter, of course. Considering you're using a friction drive system, you might find the GX35 to be superior for your application.
     
  3. bikejock

    bikejock Member

    That makes sense. Just found out the bolt pattern surrounding the clutch on the GX35 is a match so it should fit like a glove. With the Huasheng 49cc on there it does feel significantly heavy especially with my 64 oz gas tank on there and filled up. Had it tip over on me while I was working on it the other day. Guess I should get a center kick stand to prevent that.
     
  4. The_Aleman

    The_Aleman Active Member

    A center stand would definitely help. I've run a Crow Cycle Co center stand on my bike for a few years now, it's an excellent piece. Heavy duty.
    The GX35 is roughly 4-5lbs lighter than a HS49, so that would reduce the chance of your bike falling over, too.

    Looking at the torque specs of the GX35 makes me think you might lose as much as 33% of your power, tho.
    http://engines.honda.com/models/model-detail/gx35
    http://engines.honda.com/models/model-detail/gxh50

    Having used both the HS49 and GXH50, the GXH50 is about 5-10% more powerful than the HS49. Not much, but it's noticeable.
    You might just want to try a center stand first to see if that satisfies you, rather than sidegrade/downgrade your engine.
     
  5. bikejock

    bikejock Member

    Ah I see. Based on RPM estimates & my drive roller size, it looks like I can go at least 20-25 mph easily with the GX35 which is good around my area because I stick to bike paths anyway and most roads have a posted speed limit of 25 mph.

    I would get a GX50 for more power but they are ridiculously expensive compared to the GX35. I usually see the GX50 go for $400 and a clutch kit is an extra $120. I'm also trying to keep the weight down as much as possible while maintaining moderate power. The GX35 seems good for that.
     
  6. KCvale

    KCvale Motorized Bicycle Vendor

    You will sure fell the power loss.
    Be prepared to pedal a lot.

    What is wrong the HS 49 you have?
    Just running poorly?
    Adjust your valve rockers to .04mm on the carb side and .06mm on the exhaust side, and drop in an NGK 7544 (CR7HIX) Iridium spark plug.

    I am no fan of any rack mounted engine, especially friction drives, but I'd go the other way.
    Keep the power and change the carb from a gravity feed to a suction type and put your tank in the center cavity below the wheels center point of gravity.
    2 birds with one stone for cheap.
     
  7. bikejock

    bikejock Member

    Nothing wrong with my HS49 KC, just want something less bulky and lighter that would basically last forever & Honda is more known for reliability than Chinese brand engines. For A daily commuter bike I would want a Honda engine. Can't really do anything in frame with my mountain bike because my frame is way too small so a rear mounted engine & gas tank is my only option for this project. Might use my HS49 for a go kart project someday.
     
  8. KCvale

    KCvale Motorized Bicycle Vendor

    Change the oil regularly and they run a long time, but wear is wear.

    You know you could always go with an electric shifter for ~$650.
    SickBikeParts has a 48V system for $325.
    http://www.sickbikeparts.com/catalo...ucts_id=181&osCsid=9v16vtndtm6qavbu88m2i48td0

    Put a $325 'water bottle' battery in the frame mounted on the frames water bottle holder mount and you have a light, quite, and clean MB that is not top heavy.

    [​IMG]

    It has more power than a 35cc and it uses your pedal gears in the drive.
    Gears change everything.

    The downside is range.
    The higher the Amp Hours (Ah rating) the farther you can go, roughly 1-2 miles per Ah.
    Help it with some pedaling and you can far exceed that.

    Just another option to a gas engine on the back rack.
     
  9. bikejock

    bikejock Member

    That 'water bottle' E bike is interesting but as I said I can't do anything in-frame with the bike I'm using. Ironically I ended up with the mountain bike with the smallest frame size. I also want good range & a 35cc with a 64oz gas tank can go much further than any E bike. Might not go faster but 20-25 mph is faster than I can go pedaling. Oil changes will be easier with a friction drive set up. When it was on my in frame bike I had to unbolt the engine in order to drain the oil. With a friction drive I can leave the engine bolted to the bike durring the oil change.
     
  10. The_Aleman

    The_Aleman Active Member

  11. bikejock

    bikejock Member

    The_Aleman; That's a nifty idea that would make oil changes for 4 stroke in frame engines easier. Might get one if I ever decide to do another in frame 4 stroke build.

    My next build after this friction drive bike will be a 2 stroke cruiser. I know 2 stroke china girls aren't known for quality but they are easy & kinda fun to mod/work on & parts are easy to get.
     
  12. KCvale

    KCvale Motorized Bicycle Vendor

    I just use a big 'feeding tube' syringe with some gas line on the end to both fill and drain 4-strokes.
     
  13. bikejock

    bikejock Member

    I got my GX35 on the bike and running & it's a great engine. I put about 5 hours on it with no problems at all. I get great speeds for the size. I think I hit 25-30 mph a few times easily on level ground. I do have to pedal assist it up hills because it struggles on the incline. I'm glad I swapped the HS 49cc for the GX35. For a friction drive it's the better choice. The bike is noticeably less heavy in the rear putting less stress on my kickstand. I'm getting a 30 ounce MSR fuel bottle to help extend the range of the gas tank because on the stock 20 ounce gas tank I found myself refueling after about every 5 to 10 miles. Acceleration isn't great but when I start reaching max speed its a blast. I'm glad I got a light weight bike because that helps with top speed & gas mileage.
     
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