two stroke engines

GoldenMotor.com

flyboy605

New Member
May 14, 2008
17
0
0
HI TO ALL
I just installed the "Popular" two stroke engine and I think it was a waste of time and money, they vibrate so bad that you can only run about 1/2 or less throttle and the motor is very very noisy.
I also have a Whizzer and it is a real joy especially after I installed the ''QUENTION" FIX, hope this helps answer some questions--- Flyboy605:ride2:
 

thatsdax

Member
Feb 22, 2008
868
4
16
www.thatsdax.com
What kind of bike are you using it on? Also..There are at least 50 different versions of the 2 stroke. The smaller the version the smoother. Some are smooth as silk. Others vibrate more. Depends.. Typically they all get much smoother after 300-400 miles. Did you mount your engine on a chopper bike? Also... Lose mounting or improper mounting accounts for over 50 percent of any excessive vibrations. I personally own and ride at least 4. I have built over 300. I have never ever had one with vibration that was objectionable. I have had a few that were smooth as silk and as smooth as any Titan 4 stroke. Most vibrate at the higher revs but never did it become objectionable to the point where I did not have a smile on my face !!! Give us the low down.. Maybe we can help. Thanks..And.. Enjoy the ride...
 

Pablo

Master Bike Builder & Forum Sponsor
Dec 28, 2007
3,696
33
48
Duvall, WA PNW
www.sickbikeparts.com
HI TO ALL
I just installed the "Popular" two stroke engine and I think it was a waste of time and money, they vibrate so bad that you can only run about 1/2 or less throttle and the motor is very very noisy.
I also have a Whizzer and it is a real joy especially after I installed the ''QUENTION" FIX, hope this helps answer some questions--- Flyboy605:ride2:

Kind of a general statement. My 2-stroke is pretty smooth at WFO, 40 mph, and maybe a tad noisy up close, but I have an expansion chamber.

Whizzers look OK, but are expensive, not that modifiable, and frankly have too much junk hanging off them. Not my cup of tea.

What question were you trying to answer?
 

jasonh

New Member
Jun 23, 2008
1,590
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0
40
Longmont, CO
I have an earlier Dax kit (according to the guy I bought it from) and it's as smooth as an ice cold beer on a hot day.

Could also try making some real automotive type mounts to limit vibrations.
 

flyboy605

New Member
May 14, 2008
17
0
0
HI to all
I will try and shed a little light on my bike First I am not a "Newbie" I am long of tooth and have been playing with this type of stuff for a long time so the obvious stuff (Loose mounts ect ect) does not apply. I am using a "Moon Dog" 26in bike I got at W_M and had to devise a Motor Mount but it is very solid, bolted solid to the frame no rubber mounts, when I am running about 1/2 throttle its very noisy a vibrates a lot, when I pull the clutch lever in and let up on the throttle its gets quiet and of course no vibration, this about sums it up it idles well and starts easy, All ideas will be appreciated Thanks FB 605
 

captainrichhill

New Member
May 31, 2008
202
0
0
Mine vibrates alot! I have pieces of innertube under each mount. I'm hoping it will smooth out as it gets broken in. It has already gotten faster. I only have about 35 miles on it so far.
 

jasonh

New Member
Jun 23, 2008
1,590
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0
40
Longmont, CO
Well unfortunately with these motors coming from up to 50 different factories, plus the poor QC, it's gonna happen.
 

MotorbikeMike

Dealer
Dec 29, 2007
477
3
18
Sacramento
Hi just a note here as it greives me to have so many pieces of un-substaintiated "facts", on chatboards.

At last known count of easily identifiable factories assembling the 2-stroke in-frame chines kit, there was 1 main carb company, and 7 factories assembling and selling engine kits.

Years ago, prior to any of us ever seeing these kits, and when they were still legal in China, there may well HAVE been 50 factories, but certainly not now.

Now adressing vibration patterns on the 2-stroke. The "China-Fires" as we used to call them are VERY crudely balanced! Some not at all, some engines run pretty nice, and some shake like a wet dog. ANYONE who doesn't believe this either lacks experiance with these engines, or is not speaking truth! Some are faster than others, some smoother, some last a long time and some seem to have the "Rice Krispie" syndrome whic is they "POP" right out of the box!

As to Pablo's ideas about Whizzer? Iniatailly this Just do the 1950's thing which is "Ride one and you'll buy one".

Scondly, since when is a dramatically de-tuned 4-stroke unmodifiable? That would meah I could not have hopped up my old 327 chevy to the point she will do 105mph in third gear, with an M20 Muncie hooked to a 3.5 gearset in a 9-inch Ford?

Carb, compression, cam, tuning, pipe, porting......all this is possible and more.

Mike
 
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chopper

New Member
Feb 6, 2009
22
0
1
Sunny florida
All these fixes unfortunatley are just band aids. What we really need is a good way to balance the engine. Thats the source of all the vibs.
 

captainrichhill

New Member
May 31, 2008
202
0
0
Has anyone been successful in balancing one of these HT engines? My buddy just got a Kings kit( I think) and right out of the box it's smoother then my engine and I have about 400 miles on mine.
 

captainrichhill

New Member
May 31, 2008
202
0
0
Interesting! I new concidered a bent crank. That could be it. Quality control is the chinese biggest problem.
Thanks
RH
 

NunyaBidness

Active Member
Jun 29, 2008
1,062
2
38
memphis tn
My buddy got a 2 smoke and we installed it on his new wally world moondoggie. It rode great out of the box. I got my motor shortly there after and had a lot of the problems I saw some folks having. My bro had none on his first motor. As I got everything straightened out on my motor and got it running very good, he got a second motor. His second didn't run as good as his first and neither of his now ran as good as mine. I outweigh him by about 70lbs and really have no problem keeping up with him and his bike is lighter than mine as well.

Making a long story shorter, I really like my motor and he hates both of his. Since his good motor is no longer running as good as it once did and he has been unable to fix it, after trying almost everything possible.
 

gberry50

New Member
Jun 16, 2009
20
0
0
snowflake,az
I seem to be having vibes at the point where it should be comming on the power band
other wise fairly smooth. I bent the exhaust pipe flange a couple of weeks ago
and had an exhaust leak blew oil all over front of engine but the vibes went away and
bike run like a stripped ass ape , I was able to experiance the full power band.and engine sounded good.I dont think balance is the problem .Is anyone producing a decent
expansion chamber for the gas bike 80cc?