Planet Minis

z50 chopper · 09-02-2009, 12:55 AM

that sounds fair cyclerider57.
I have a few questions either you or some one else here could answer.
For a 49cc engine what would be the best year case to use and why? What year crank?
What year rod and piston?
What year head?
Transmission auto or manual, what year?

I do realize there might be many opinions on these.

cyclerider57 are these the types of questions you were hoping for?

LongMooie · 09-02-2009, 01:24 AM

dangling the carrot infront of the donkey

cyclerider57 · 09-02-2009, 09:52 AM

Quote:

Originally Posted by z50 chopper

that sounds fair cyclerider57.
I have a few questions either you or some one else here could answer.
For a 49cc engine what would be the best year case to use and why? What year crank?
What year rod and piston?
What year head?
Transmission auto or manual, what year?

I do realize there might be many opinions on these.

cyclerider57 are these the types of questions you were hoping for?

That depends on what you're looking for. The old school z engines had bigger valves and piston domes as well as shorter rods. That is why a stock old z model is faster than a stock xr/crf50.

I wasn't really looking for questions at the moment. I was looking for ideas of what build people wanted to see and why. The most important thing I was looking for was general activity. Everyone wants to complain about no technical information but they now have the chance to not only bring that back but also bring it back how it relates to the specific engines they are interested in. Still, they stay silent.

motofox21 · 09-02-2009, 02:11 PM

How about an all out build of true 50. No bolt on and go parts. Do all of the tricks that people did before we were spoiled with all of the easily available updgrades. Deck the head to increase compression, lighten the stator, bore & cut a stock carb first maybe until it runs out of potential, port and polish. Do them one at time, it would let some people see what the general gains that would come with a specific mod, and more importantly any loss. As most know, any engine mod is a give and take.

chrisc161076 · 09-02-2009, 02:22 PM

Quote:

Originally Posted by motofox21

How about an all out build of true 50. No bolt on and go parts. Do all of the tricks that people did before we were spoiled with all of the easily available updgrades. Deck the head to increase compression, lighten the stator, bore & cut a stock carb first maybe until it runs out of potential, port and polish. Do them one at time, it would let some people see what the general gains that would come with a specific mod, and more importantly any loss. As most know, any engine mod is a give and take.

Sounds a good idea and the true 50 theme sounds strong, if you start with the carb see where it goes and what interest comes.

50rider340 · 09-02-2009, 02:52 PM

I like the idea of a 88 based motor with either huge bore de-stroked or if it would even be possible to stroke out a 39mm piston to reach 88cc's. I dont even think that would be possible maybe.

cyclerider what head would you be starting with? Stock xr50 head or ct70, xr70 etc. In order for me to come up with a funky cool build I need a couple guidlines to follow other than 88cc build.

head mods I would try to change it as much as possible with different valve angle, diameter and fish bowl the combustion chamber. If memory serves me correct the difference in valve angle a takegawa super head has is like a 10 degree difference than a old style ct70 head. I may be wrong on that one, angle plays a huge role in the efficiency of a head. Is that why there is such a difference in performance with a take head besides the huge cam and large valves?

When ever you start post pictures. Then you will get the views. People love pictures hahh.

nickypoo · 09-02-2009, 02:56 PM

88cc motor build with or without a head. talk about a fun 10" bar banging/racing bike!

s_10onbagz · 09-02-2009, 04:46 PM

I would really like to cut down a an aluminum jug 10mm and run a 10mm shorter rod with a skirtless piston just to see how it would run. The rod stroke ratio might be pretty sh itty, but it would be quite a bit lighter rotating mass.

If that worked I think I would try the tak 106 s-cut piston and jug turned down 10mm so it has a spigot, then bore the cases. Either motor I would definately run a high compression piston and an xr70 or race head.

chasetheface123 · 09-02-2009, 05:03 PM

180 nice, dohc, fcr carb, billet cases, and a small garret turbo. Funn stuff.

s_10onbagz · 09-02-2009, 05:07 PM

Also the cr80 flywheel fits on if someone wanted to make a cheaper outer rotor kit.

slimbo · 09-02-2009, 06:30 PM

Quote:

Originally Posted by themountain

+2......whats your point with this thread then ,Cyclerider???...the guys do not ask the right questions??? ooh.....

Maybe you got an Idea about a build and we discuss it...?

anyway , I need some beer now and move on

what kinda beer you drinking over there?

PHATDAN420 · 09-03-2009, 01:01 AM

maby we should get some vidoes of almost every differnt bore kit, so we can hear and see what they have to offer...compare pipes N Bore kits......

Not a engine question but i never wanted to make a new thread so i thought i would ask it here.

bballard9606 · 09-03-2009, 02:04 AM

Quote:

Originally Posted by s_10onbagz

Also the cr80 flywheel fits on if someone wanted to make a cheaper outer rotor kit.

what exactly is an outter rotor kit? and whats the difference between that and an irk??

PHATDAN420 · 09-03-2009, 02:16 AM

think it a differnnt size flywheel

Crf50 inner rotor image by bridecory on Photobucket

http://shindypro.com/xr50/images/50-506-L.jpg

Not 100% could be wrong jus tryin to help

bballard9606 · 09-03-2009, 02:17 AM

hmmm. thx. i saw a outer one before but didnt know. didnt wanna start a thread. thought this was a good place. haha.

which is better?

PHATDAN420 · 09-03-2009, 03:24 AM

Quote:

Originally Posted by bballard9606

hmmm. thx. i saw a outer one before but didnt know. didnt wanna start a thread. thought this was a good place. haha.

which is better?

I think it's personal prefrence

Adam z50+R · 09-03-2009, 04:45 AM

the 88cc de-stroked route, i'd love to see
maybe using an s-cut piston with the crank modded to accept,, lets say a titanium con rod or a custom article
stroke to bore like 32? x 57
5 speed
as lighter rotating mass as possible

maybe to sound kinda like this honda dream 50 (cr110)

YouTube - Honda CR110

also cyclerider ,what would it take to convert a honda 4 to a dready 2 stroker ( .........awaits the massive hate influx

)

BlackBeard · 09-03-2009, 05:47 AM

de-stroked 88. But i see your issue cycle, you want to move more towards the notion of tech information with questions pertaining to that. So how about I start it off, why not discuss the average valve weight and what type/ weight spring you can run to be as light as possible without float? seems on these boards everyone thinks there motor will turn 15K, which isnt unreasonable but once in a blue moon do the mis-informed even begin to ask about floating those suckers.

z50 chopper · 09-03-2009, 05:58 AM

cyclerider57 I think the best would be YOU deciding on what type of engine YOU want to build and detail the build explaining why YOU chose each part.

I'd personally would like to see an e-start 6 volt or 12 volt c70 passport engine build as this is what I am planning on building myself, I have no experience with building the honda horizontal engines or vertical engine for that matter and it would be of great help to me. But failing that a CT70 engine based build would be the next best thing or how to convert a 6 volt points engine to 12 volt cdi engine etc... or an old school 50cc pushrod engine build from the early 60s.

Well let us know what YOU decide to build after all it is YOUR engine, unless you are building it by commission then that person you are building it for would have say in the direction of the build and nobody else.
The point of this hobby (any hobby in fact) is to have fun.

z50 chopper

p.s. Did I get my point across?

z50 chopper · 09-03-2009, 12:31 PM

Quote:

Originally Posted by themountain

YOU canadians ARE weird....

not all of us, only some of us

09-02-2009, 12:55 AM	#41 (permalink)
z50 chopper 2nd Gear Member Join Date: Jun 2009 Location: Nanaimo, BC, Canada Posts: 504 My Mood:	Re: Engine Tech Build Project that sounds fair cyclerider57. I have a few questions either you or some one else here could answer. For a 49cc engine what would be the best year case to use and why? What year crank? What year rod and piston? What year head? Transmission auto or manual, what year? I do realize there might be many opinions on these. cyclerider57 are these the types of questions you were hoping for?

09-02-2009, 01:24 AM	#42 (permalink)
LongMooie 3rd Gear Member Join Date: Jun 2005 Location: originaly UK! now Central valley, Cali Posts: 1,114 My Mood:	Re: Engine Tech Build Project dangling the carrot infront of the donkey

09-02-2009, 02:11 PM	#44 (permalink)
motofox21 1st Gear Member Join Date: Feb 2006 Location: Richmond, Virginia Posts: 137	Re: Engine Tech Build Project How about an all out build of true 50. No bolt on and go parts. Do all of the tricks that people did before we were spoiled with all of the easily available updgrades. Deck the head to increase compression, lighten the stator, bore & cut a stock carb first maybe until it runs out of potential, port and polish. Do them one at time, it would let some people see what the general gains that would come with a specific mod, and more importantly any loss. As most know, any engine mod is a give and take.

09-02-2009, 02:52 PM	#46 (permalink)
50rider340 3rd Gear Member Join Date: Mar 2004 Location: CT Posts: 3,083 My Mood:	Re: Engine Tech Build Project I like the idea of a 88 based motor with either huge bore de-stroked or if it would even be possible to stroke out a 39mm piston to reach 88cc's. I dont even think that would be possible maybe. cyclerider what head would you be starting with? Stock xr50 head or ct70, xr70 etc. In order for me to come up with a funky cool build I need a couple guidlines to follow other than 88cc build. head mods I would try to change it as much as possible with different valve angle, diameter and fish bowl the combustion chamber. If memory serves me correct the difference in valve angle a takegawa super head has is like a 10 degree difference than a old style ct70 head. I may be wrong on that one, angle plays a huge role in the efficiency of a head. Is that why there is such a difference in performance with a take head besides the huge cam and large valves? When ever you start post pictures. Then you will get the views. People love pictures hahh.

09-02-2009, 02:56 PM	#47 (permalink)
nickypoo 2nd Gear Member Join Date: May 2006 Location: Glendora, SoCal Posts: 987	Re: Engine Tech Build Project 88cc motor build with or without a head. talk about a fun 10" bar banging/racing bike!

09-02-2009, 04:46 PM	#48 (permalink)
s_10onbagz 3rd Gear Member Join Date: Sep 2007 Location: Connecticut. Posts: 1,550	Re: Engine Tech Build Project I would really like to cut down a an aluminum jug 10mm and run a 10mm shorter rod with a skirtless piston just to see how it would run. The rod stroke ratio might be pretty sh itty, but it would be quite a bit lighter rotating mass. If that worked I think I would try the tak 106 s-cut piston and jug turned down 10mm so it has a spigot, then bore the cases. Either motor I would definately run a high compression piston and an xr70 or race head.

09-02-2009, 05:03 PM	#49 (permalink)
chasetheface123 Chuck Norris for president! Join Date: Nov 2007 Location: Boyne City Michigan Posts: 4,817 My Mood:	Re: Engine Tech Build Project 180 nice, dohc, fcr carb, billet cases, and a small garret turbo. Funn stuff.

09-02-2009, 05:07 PM	#50 (permalink)
s_10onbagz 3rd Gear Member Join Date: Sep 2007 Location: Connecticut. Posts: 1,550	Re: Engine Tech Build Project Also the cr80 flywheel fits on if someone wanted to make a cheaper outer rotor kit.

09-03-2009, 01:01 AM	#52 (permalink)
PHATDAN420 2nd Gear Member Join Date: Jan 2008 Location: Fort McMurray Alberta Posts: 774 My Mood:	Re: Engine Tech Build Project maby we should get some vidoes of almost every differnt bore kit, so we can hear and see what they have to offer...compare pipes N Bore kits...... Not a engine question but i never wanted to make a new thread so i thought i would ask it here.

09-03-2009, 02:16 AM	#54 (permalink)
PHATDAN420 2nd Gear Member Join Date: Jan 2008 Location: Fort McMurray Alberta Posts: 774 My Mood:	Re: Engine Tech Build Project think it a differnnt size flywheel Crf50 inner rotor image by bridecory on Photobucket http://shindypro.com/xr50/images/50-506-L.jpg Not 100% could be wrong jus tryin to help

09-03-2009, 02:17 AM	#55 (permalink)
bballard9606 3rd Gear Member Join Date: Apr 2009 Location: Moreno Valley, CA Posts: 1,159 My Mood:	Re: Engine Tech Build Project hmmm. thx. i saw a outer one before but didnt know. didnt wanna start a thread. thought this was a good place. haha. which is better?

09-03-2009, 04:45 AM	#57 (permalink)
Adam z50+R 2nd Gear Member Join Date: Sep 2008 Location: England Posts: 298 My Mood:	Re: Engine Tech Build Project the 88cc de-stroked route, i'd love to see maybe using an s-cut piston with the crank modded to accept,, lets say a titanium con rod or a custom article stroke to bore like 32? x 57 5 speed as lighter rotating mass as possible maybe to sound kinda like this honda dream 50 (cr110) YouTube - Honda CR110 also cyclerider ,what would it take to convert a honda 4 to a dready 2 stroker ( .........awaits the massive hate influx )

09-03-2009, 05:47 AM	#58 (permalink)
BlackBeard "ZBBT" Join Date: Oct 2007 Location: 50 riders Posts: 1,836 My Mood:	Re: Engine Tech Build Project de-stroked 88. But i see your issue cycle, you want to move more towards the notion of tech information with questions pertaining to that. So how about I start it off, why not discuss the average valve weight and what type/ weight spring you can run to be as light as possible without float? seems on these boards everyone thinks there motor will turn 15K, which isnt unreasonable but once in a blue moon do the mis-informed even begin to ask about floating those suckers.

09-03-2009, 05:58 AM	#59 (permalink)
z50 chopper 2nd Gear Member Join Date: Jun 2009 Location: Nanaimo, BC, Canada Posts: 504 My Mood:	Re: Engine Tech Build Project cyclerider57 I think the best would be YOU deciding on what type of engine YOU want to build and detail the build explaining why YOU chose each part. I'd personally would like to see an e-start 6 volt or 12 volt c70 passport engine build as this is what I am planning on building myself, I have no experience with building the honda horizontal engines or vertical engine for that matter and it would be of great help to me. But failing that a CT70 engine based build would be the next best thing or how to convert a 6 volt points engine to 12 volt cdi engine etc... or an old school 50cc pushrod engine build from the early 60s. Well let us know what YOU decide to build after all it is YOUR engine, unless you are building it by commission then that person you are building it for would have say in the direction of the build and nobody else. The point of this hobby (any hobby in fact) is to have fun. z50 chopper p.s. Did I get my point across?

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