two stroke engines

flyboy605 · #1 07-16-2008, 10:38 AM

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

thatsdax · #2 07-16-2008, 02:05 PM

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 · #3 07-16-2008, 02:17 PM

Quote:

Originally Posted by flyboy605

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

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 · #4 07-16-2008, 02:48 PM

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 · #5 07-16-2008, 09:25 PM

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 · #6 07-16-2008, 10:38 PM

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 · #7 07-16-2008, 10:40 PM

Well unfortunately with these motors coming from up to 50 different factories, plus the poor QC, it's gonna happen.

FileStyle · #8 07-17-2008, 10:40 AM

ride it like you stole it!

MotorbikeMike · #9 07-17-2008, 02:37 PM

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

**Bikeguy Joe** · #10 07-17-2008, 07:30 PM

I like those big block Briggs you see on racing karts.