Next-avalon friction drive 31cc

Ibedayank · Apr 11, 2012

just a sub $500 dollar build to have some fun riding

start with the bike

add 31cc friction drive kit

Ibedayank · Apr 11, 2012

grind brackets so mount clears tire

cannonball2 · Apr 13, 2012

Thats a good little kit. I had one. Once set up it will quickly swap from one bike to the Next(haha).

Ibedayank · Apr 13, 2012

with motor mounted

mount to carry gas... it needs it

Ibedayank · Apr 13, 2012

buy new tires to replace the crappy stock tires....
rear won't fit have to rebuild rear mount
now it won't come out of alignment again

Ibedayank · Apr 13, 2012

still need to make dual rear struts for rear motor mount
make mounts for 64 ounce tank
take bike apart and cleanup mount and repaint

GearNut · Apr 14, 2012

It looks like a fun build!

Ibedayank · Apr 14, 2012

for the $$$ its a nice little kit and a good match for the bikes 7speeds
in 7th gear you max out pedaling candance as the motor really starts to sing

GearNut · Apr 14, 2012

I also like the idea of rear suspension. The best I can do is get a spring loaded seat post. You have real suspension.

Ibedayank · Apr 14, 2012

GearNut said:
I also like the idea of rear suspension. The best I can do is get a spring loaded seat post. You have real suspension.

it does a good job smoothing out the bumps on a paved road but would not take it offroad. The bicycle really is not built that heavy.

GearNut · Apr 14, 2012

Heavy duty or not, it is a nice platform to build a friction drive with.

Ibedayank · Apr 15, 2012

took the bike for a few mile ride today
roller is perfectly inline to the tire
Found something interesting tho after 1/2 throttle it does not really go any faster or have any more power just gets louder

and the bearings on the roller are the same as used on 5/8s jackshafts for gocarts
$2 each http://www.mfgsupply.com/gomini/gominibearings/az8205.html

killercanuck · Apr 15, 2012

Noice build! An engine is just a compressor with spark, the more air flows through the more power you get, especially with a thumper.

GearNut · Apr 16, 2012

Is it perhaps running a bit rich after 1/2 throttle?

Ibedayank · Apr 16, 2012

plug burns nice and tan just runs out of power just get louder and actualy loses power at WOT

Dirt Road Cowboy · Apr 17, 2012

I'm running the same kit, and I noticed the power drop too. I thought it might improve once the engine broke in more.

Maybe carb jetting, or better intake flow? Maybe a less restrictive exhaust?

.

Ibedayank · Apr 17, 2012

DRC
have you noticed a ""sweetspot"" where the motor gets quiter but has more power?

Dirt Road Cowboy · Apr 17, 2012

Ibedayank said:
DRC
have you noticed a ""sweetspot"" where the motor gets quiter but has more power?

It seems to be between 1/2 to 3/4 throttle. Then it roars and slows. Roll off the throttle, and it takes off again.

At first, I thought the FD roller was slipping on the tire, but I found out it wasn't.
Then I was thinking clutch slippage.

I was just going to wait for a few miles to see if it needed a better break-in. Then I was going to experiment with intake and exhaust.

I'm aware that it will never be a speed demon, but I don't think it's even going 20 mph right now.

Ibedayank · Apr 17, 2012

I have about 30 miles on mine at this point and did change to a staton 7/8s roller and new bearings as the ones that came with the kit had a gritty feeling when you spun the roller. I have been unable to find specs on this Chonda motor but the motor its based on I did find the setting for valvelash for the honda 33cc

spark plug gap .024-.028

idlespeed 3100 +- 200 rpm

valve clearance COLD IN. o.08mm +- .02
EX 0.11mm +- .02
oil 10/30 in temps 90f and above 30 weight
spark plug NGK cm5h or cmr5h

hope this info helps others with this kit

GearNut · Apr 17, 2012

Dirt Road Cowboy said:
It seems to be between 1/2 to 3/4 throttle. Then it roars and slows. Roll off the throttle, and it takes off again.

That is a typical symptom of a too lean air/ fuel ratio. Reduce the incoming volume of air by reducing the throttle position to a point where the fuel delivery can match it and you get power again.

Next-avalon friction drive 31cc

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