Homemade reed valve, the search begins

[skyash]

I got a reed valve in my 49 cc pocket bike motor and it keeps that spray back off the frame. It's Ment to have a balanced bottom end and big bore kit. Ment to make 4 hp and do 12000 rev at the moment it hits 64kmh and revs out so going for a smaller sprocket soon no peddling ever so far after haveing like 10 66cc and 1 for stroke this is the best motor never eny issues and go's like that out the box. just aim and hang on

 

[HeadSmess]

Your 48's could do what my 66 could do with nothing more than removing casting flash from the ports? Wow! Challenge accepted! Breaking laws of physics will be alot harder than you think! I plan to get my 66 up to about 15 HP without going over 9000 rpm's at maximum speed. A little 48 with restricted flow volume will not even get anywhere near 10 HP. At least I will know that I have exploited every mod possible to squeeze as much power as possible from any 66 cc engine without making a high rpm noise machine out of it.... I'll bet my tuned pipe is better than any decent tuned pipes that come off the shelf ;-)

i didnt even remove casting flash half the time. just grab engine from box, install, wack on a pipe.

keep talking HP numbers... i seriously doubt youre getting over 4.

yeah, my pipes were pretty rough.

this one was definitely lousy. too sharp on the angles.

this one was the best.

and of course, i just dawdled along. maybe i should have pedaled as well? that particular frame though...deathtrap. last time i used it.


i still havent filled the hole

 

[Fabian]

Reed valves are a significant benefit for improving low and midrange torque.

 

[Deleted member 12676]

this page shows a picture of the first reed valve ever for these engines, my home-made one. http://www.dragonfly75.com/motorbike/reedvalve.html
It was made of aluminum from a cooking pan, held together with JBWeld. The reeds were cut from a sheet of .5mm carbon fiber. It lasted about a year with daily riding.
I prefer an engine with a reed valve and think the one from Rock Solid is good enough.

 

[Rob H]

Reed valves are a significant benefit for improving low and midrange torque.

I agree it should be illegal not to have a reed cage on a 2stroke

 

[lazylightning@mail.r]

i didnt even remove casting flash half the time. just grab engine from box, install, wack on a pipe.

keep talking HP numbers... i seriously doubt youre getting over 4.

yeah, my pipes were pretty rough.

this one was definitely lousy. too sharp on the angles.

this one was the best.

and of course, i just dawdled along. maybe i should have pedaled as well? that particular frame though...deathtrap. last time i used it.


i still havent filled the hole

Wow! Thanks for the video! I do agree with you, that you deserve to see a video from me before you should be expected to believe my engine power boasting. And a video you shall get, as soon as I get this engine together. It was nice to see the Australian countryside. My brother married a girl from Sydney and moved off to Australia 10+ years ago and is still there. That bike sure was dawdling along and it was easy to hear how it was challenged by those hills. But despite this, the video made my hair stand on end and adrenaline pour out......watching how you drive down the left side of the road! ;-)
I found some 3mm diameter spokes with a 262mm length that laced up right nice in a double walled reinforced type inexspensive rim. I use some old inner tubes and slice them lengthwise and use one to wrap around the inflating inner tube from inside and one from outside. This helps protect the inflated inner tube from pinches when hitting pot holes at high speeds. I use some 2.35 tires with knobbies. When I get the wheel built and tightened and aligned up perfectly, I go back and remove each nipple from one spoke at a time and put some rubber cement inside of the nipple and re-install it to good-and-tight. I do all the threads on all of the spokes like this and wait for it to cure for a day or so before riding. This way the spokes never get loose even after riding on rough rocky and potholed roads. It will last a year before they begin to loosen up a bit. Without the glue on the threads, it's a matter of two weeks or so and the spokes get loose. It can seem to happen all at once too. With the glued threads they never become very loose even when they have begun to loosen up somewhat. The nipples are still turnable though, that's what counts ;-)
I bought some carbon sheet for my reed today. The reed house is ready, I just need to weld up the cover with the tube sticking out....

 

[HeadSmess]

Wow! Thanks for the video! I do agree with you, that you deserve to see a video from me before you should be expected to believe my engine power boasting. And a video you shall get, as soon as I get this engine together. It was nice to see the Australian countryside. My brother married a girl from Sydney and moved off to Australia 10+ years ago and is still there. That bike sure was dawdling along and it was easy to hear how it was challenged by those hills. But despite this, the video made my hair stand on end and adrenaline pour out......watching how you drive down the left side of the road! ;-)
I found some 3mm diameter spokes with a 262mm length that laced up right nice in a double walled reinforced type inexspensive rim. I use some old inner tubes and slice them lengthwise and use one to wrap around the inflating inner tube from inside and one from outside. This helps protect the inflated inner tube from pinches when hitting pot holes at high speeds. I use some 2.35 tires with knobbies. When I get the wheel built and tightened and aligned up perfectly, I go back and remove each nipple from one spoke at a time and put some rubber cement inside of the nipple and re-install it to good-and-tight. I do all the threads on all of the spokes like this and wait for it to cure for a day or so before riding. This way the spokes never get loose even after riding on rough rocky and potholed roads. It will last a year before they begin to loosen up a bit. Without the glue on the threads, it's a matter of two weeks or so and the spokes get loose. It can seem to happen all at once too. With the glued threads they never become very loose even when they have begun to loosen up somewhat. The nipples are still turnable though, that's what counts ;-)
I bought some carbon sheet for my reed today. The reed house is ready, I just need to weld up the cover with the tube sticking out....

that was the first flat i had in...six or seven years. bloody skinny racer tyres, no good. my preference is for something fat, but that particular frame wouldnt accept anything over 1"... looked good when i first got it, ended up on the roadside collection within 6 months. 99 bikes...never again!

 

[Frankfort MB's]

HS how fast were you going in that video? Sounded fast lol

 

[Joshbus]

I got a reed valve in my 49 cc pocket bike motor and it keeps that spray back off the frame. It's Ment to have a balanced bottom end and big bore kit. Ment to make 4 hp and do 12000 rev at the moment it hits 64kmh and revs out so going for a smaller sprocket soon no peddling ever so far after haveing like 10 66cc and 1 for stroke this is the best motor never eny issues and go's like that out the box. just aim and hang on

I have been thinking about trying out a pocket bike engine on my next build , especially if they are more reliable than typical 66cc engines. How long have you had this engine? Any issues since this post ? Thanks

 

[skyash]

Nothing really one pull start since new and Iam never happy with my clutch seems to slip but didn't be for .at the start being a racing engine thay worn about excessive vibration so it shakes it's self to bits locktite everything.and the gear box need a heavy duty chain even a diy tensioner in side and any restrictions to the muffler and it slows it down a lot so it's loud lol and I had to run a 20inc wheel with a 52t sprocket think Iam on a 50t now gets to 7kmh like a dirt bike twice as fast as my best 66cc but I only weigh 65 kg