Beachcruiser with rear suspension

Charged-Reacter · #21 (**permalink**) 09-16-2009, 10:45 AM

The movement of chain tension on the bicycle- a person has to
look really close to even notice any movement. The roller coaster
effect comes from no upper rear arm supports and a persons'
weight while riding over bumbs. This would not make any use
for off road use. Street bike only.

Charged-Reacter · #22 (**permalink**) 09-16-2009, 01:05 PM

After riding and testing out the bicycle and letting
it soak in for a few days. This bike can be done with
the china girl engine. I will save the shift kit for another
project bike.
A person can set the engine in really low and make it
completely level. Now I can use manic mechanic carburetor
intake that i I have just sitting around. I will use SBP oversize
front tube engine adapter plate and the seat tube is a little larger
diameter size than motor mount spacer, but that can be worked out.
With manic mechanic short intake there is plenty clearance for the carburetor
without interferance of the seat tube. Get the longer 410 chain for the
proper chain length and use the stock chain tensioner because the rear suspension
movement is hardly noticable at all. Exhaust muffler should not be much of a problem.
A clam shell adapter would be a nice. I will use a nice spoked rim with coaster brakes.
The shimano internal gear 8-speed will have to be relaced with good spokes and a quality
rim- that can go on another project bike. A front drum brake rim and some nice tires with
a nice springer in front. A behind the down tube gas tank set up. That will make a nice
street motorized bike.

When all hope is dashed- pull out all resources.

GearNut · #23 (**permalink**) 09-17-2009, 11:20 AM

That is good news. Will you be posting build pics?
I would like to watch the progress.

Charged-Reacter · #24 (**permalink**) 09-17-2009, 01:19 PM

GearNut... I will be doing 2-builds this winter. I will post pictures
of this build. My other build that I will be doing has already been
covered. Right now I am enjoying what good riding weather we
have left in Illinois. I am about finished with breaking in the Grubee
66cc SkyHawk engine. No major problems... just the bolt hole threads
on rightside clutch cover came out with the 2 of the bolts when adjusting
clutch. I will keep fuel mixture at 25 to one on this engine because it seems
to thrive on this mixture. The CH80 does not have this problem with threads
coming out with the bolts. Chris must retap them when he replaces the bolts
with allen heads. The only problem I had with his engine was with the plastic
float being upside down and taking on fuel. THE CH80 thrives on a 32 to 1 mixture. Monday I will switch engines again to the power king shop 67cc slant head. I hope my luck holds out on this engine too. Enjoy the riding weather.

Kevlarr · #25 (**permalink**) 09-17-2009, 01:42 PM

Quote:

Originally Posted by Ghost0

It is amazing what a photo can do. I see now that the rear suspension pivot is in front of the bottom bracket meaning the bottom bracket moves with the suspension. This would cause problems with the Shift Kit altering the chain tension from the jackshaft to the chainrings. Oh well, better luck next time.

If it were a regular derailleur set up they could have put the pivot at the crank tube like a full suspension mtn bike has.

If my son ever gives up his full suspension bike it's gonna get chopped up for parts so I can make something similar to this.

azbill · #26 (**permalink**) 09-17-2009, 02:42 PM

it looks like the stretch would be an easier build...
the pivot is behind the seatpost and it looks like that jack-shaft could be extended to the drive side of engine ....
oh man, grampa has visions of nuvinci + 3" tires front n back !!!

if only I could win the lottery

Charged-Reacter · #27 (**permalink**) 09-17-2009, 03:43 PM

Azbilll.....your grandkids are your lottery. Teach them how to pick up
nightcrawlers for you. You will have the money to buy what you want in less
than 3-months... if it was just turning spring. Teach them while they are young
because when they grow older they wise up....lol

azbill · #28 (**permalink**) 09-17-2009, 05:10 PM

agreed on my winnings

TY, sometimes I forget how lucky I am

GearNut · #29 (**permalink**) 09-17-2009, 10:22 PM

Quote:

Originally Posted by Charged-Reacter

The only problem I had with his engine was with the plastic
float being upside down and taking on fuel.

Now I find that peculiar.
All of the Grubee style floats I have had in my hand (3 of 'em) were sealed completely. There really was no top or bottom to them. They did not have a vent hole or anything like that on the top to let fuel inside if it were up-side-down.
Hmmmmm...... wierd. :confused:

Charged-Reacter · #30 (**permalink**) 09-18-2009, 05:14 AM

GearNut ...you have to look really close at the float to
even see it. The seam is close at the top. Azbill alerted me
about this on a carburetor thread.
I am going ahead and mount a engine to the soft ride cruiser
sometime this morning. I have to know if my muse intuition is
correct about this bicycle. I will use a SBP 1-5/8 inch front
tube adapter. The 1-1/2 inch one is really the one I need
more likely. The engine mount extention spacer for the down tube
will be out of a Grubee kit that has the larger size mount.
I am pretty sure this will be a direct bolt on. I will peddle the bike
around for a couple of days with just the motor mounted and see
if the rear mount holds up with out stripping out.