80cc engines differ

blankbox7

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I bought my 80cc engine about a year ago, and my friend got one 4 months after. Both were purchased from the same place and I assembled both of them. I am on my 600th mile and everythings running great. Takes off smoothly, idles nicely, and has a decent top speed. My friend on the other hand, his has a whole lot of low end torque, a fast top speed, but his doesn't idle very well. Our bikes are the same, including carb and exhaust... What would cause his to be better? I'm not complainin, just very curious.

(we use the same oil and gas too)
 
firstly, there is NO SUCH THING as an 80cc Happy Time.

secondly, see above...inconsistancies in advertising & sales practices could explain the inconsistancies in engines that are otherwise "the same" :geek:

edit: that said, if you KNOW they are the same, double-check the mixture settings.
 
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firstly, there is NO SUCH THING as an 80cc Happy Time.

secondly, see above...inconsistancies in advertising & sales practices could explain the inconsistancies in engines that are otherwise "the same" :geek:

edit: that said, if you KNOW they are the same, double-check the mixture settings.

How could inconsistencies in advertising & sales affect the performance of an engine that is otherwise the same?

Jim
 
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i said "the same" in quotations meaning maybe not the same. also note the OP didn't mention the source, so i replied with some generic but relevant info.

since there's no such thing as an 80cc engine yet the OP states he has one, we can surmise the OP was lied to...where there's one lie there might be others. i've personally seen more than one case where 2 "identical" engines from the same seller turned out to be different versions albeit similar enuff to hoodwink the beginner. all it takes is 2 carbys from 2 different sources to have differences in performance in 2 otherwise "identical" kits.

im(experienced)o, anyone still listing 66's as 80's is either an outright liar or just too dumb to know what he's selling...i recommend avoiding liars and dummies as common sense.
 
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I bought my 80cc engine about a year ago, and my friend got one 4 months after. Both were purchased from the same place and I assembled both of them. I am on my 600th mile and everythings running great. Takes off smoothly, idles nicely, and has a decent top speed. My friend on the other hand, his has a whole lot of low end torque, a fast top speed, but his doesn't idle very well. Our bikes are the same, including carb and exhaust... What would cause his to be better? I'm not complainin, just very curious.

(we use the same oil and gas too)

there are a number of factories that make these things. Your vendor could have any number of suppliers offering "the same" engines. Very common.... they say you bought a grubee but it is actually a flying hoarse. Only way to tell is by the manufacturers plate or sticker that comes on the side of the engine. It tells you where and when the engine came from.
 
Wow, that is helpful info there augiegod.

It is true there are no 80cc, they are all 66cc. This guy is a newbie.

There are many flavors of engines out there from many factories. Manufacturing tolerances vary greatly. I have ran 5 HT motors on various bikes. Each has different personalities.

I can also say with professional race car engine building: You can build the exact same parts to the same specs, and still have one engine run differently than the other. It just happens sometimes :)
 
so you say i'm getting on blankbox for not knowing something?

yes he is a newbie, so he didn't know until now that he'd been lied to. not his fault. since enuff peeps list and sell 66's all the day long, the guys who're still selling "80cc" HT's are lying tho they don't need to. but the target is the newbie/impulse buyer as a competitive strategy, said strategy being unfair & dishonest imo. it's also a great way for the "box-seller" to dump shabby goods.

as you know, i have a personal stake in the info at MBc being as correct and as organized as possible, far as i'm concerned there'd be no OT here at all, plenty of members browse this place daily and never leave the garage/technical area.

as you also know, we here in ocean park went through a lot of bicycle engines during MBcs' first 2 years, and we shared all we learned bluntly. shenannigans was proven on the 80cc was when we tore one down and discovered it for what it was, and posted it here in may '07, with pics: http://www.motoredbikes.com/showthread.php?t=5145&highlight=powerkingshop+rings

3 years is long enough for this to be going on. the "80" anywhere in a listing should have faded away a long time ago. one month of seriously boycotting anything-80 and no more newbies will be lied to, ubetcha...and the reputable HT-suppliers who've come along will get more of what they deserve.

since this forum subject-line will eventually be a "80cc" search result, any new newbies who click it will be clued in quick (unless you think it's ok for the seller to dupe a novice?) to the myth of the "80cc Chinese Super Bicycle Happy Time"...this is how consumers get things done, by telling each other stuff.

blankbox7: now you know more than you did about your engines :)

based on what you wrote:
of course you don't need racing experience to realize engines do have personalities. however, the closer to production level 2 engines are, the more likely they can be made to run almost identically. if you're sure you're looking at 2 "identical" kits then different mixture settings would give the results you've described. it's not a promise, it's just my best guess based on some good experience. so if you haven't already, might as well have a look at the needle-settings...or, look for a tiny leak in one engine :helmet:
 
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I bought my 80cc engine about a year ago, and my friend got one 4 months after. Both were purchased from the same place and I assembled both of them. I am on my 600th mile and everythings running great. Takes off smoothly, idles nicely, and has a decent top speed. My friend on the other hand, his has a whole lot of low end torque, a fast top speed, but his doesn't idle very well. Our bikes are the same, including carb and exhaust... What would cause his to be better? I'm not complainin, just very curious.

(we use the same oil and gas too)

Engines are just like women, they all come from the same 'creator' and all have the same basic parts but WOW what a difference among them!:giggle:
 
i said "the same" in quotations meaning maybe not the same. also note the OP didn't mention the source, so i replied with some generic but relevant info.

since there's no such thing as an 80cc engine yet the OP states he has one, we can surmise the OP was lied to...where there's one lie there might be others. i've personally seen more than one case where 2 "identical" engines from the same seller turned out to be different versions albeit similar enuff to hoodwink the beginner. all it takes is 2 carbys from 2 different sources to have differences in performance in 2 otherwise "identical" kits.

im(experienced)o, anyone still listing 66's as 80's is either an outright liar or just too dumb to know what he's selling...i recommend avoiding liars and dummies as common sense.


I agree !

What would buyers do if they bought a car that was supposed to have a V-6, but it turned out to have a 4 cyl. ?
 
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