Planet Minis

moto234 · 01-14-2009, 09:16 PM

i was piecing together a motor and i was thinking about putting a 70h 4 speed in it but i was wondering about the strength of it. i had an ahp 4 speed in the past and i was wondering how it would compair to that from those of you who have had both.

thanks for any input you have or can offer!

reynolds_brad · 01-14-2009, 09:59 PM

just from my own personal experiances with others that have tried it.

http://www.planetminis.com/f14/why-n...4-a-15717.html

moto234 · 01-14-2009, 10:01 PM

ok thanks for that and i read another from like 4 years ago that fatcaat started about old 1d3u trannys exploding gears on high power motors

firepower354 · 01-14-2009, 10:15 PM

How's the TRX70? It looks to have the same ratios and pattern as JDM Monkeys?

moto234 · 01-14-2009, 10:29 PM

ive been reading lately about people using those or wanting to use them but i dont know anything about them. im kinda new to the mad scientist way of building engine lol

what makes the gears fail? is it the way they are made (thickness, metal) or how they are ridin, or maybe a combo of both?

moto234 · 01-15-2009, 12:30 AM

o and this is gonna be paired with some kind of manual clutch and an 88 with head, not sure of what im gonna use yet

cdoublejj · 01-15-2009, 10:56 AM

i think the trx70 engine is pretty much the same or very similar to the ct70 engine.

fiveho · 01-15-2009, 11:01 AM

the trx gears are heavier

moto234 · 01-15-2009, 12:19 PM

does that make them better than the ct gears?

fatcaaat · 01-15-2009, 12:39 PM

CT70H and CL70 trannies are fine. It is the 1 down, 3 up older trannies that have trouble. They work fine until you put 10+hp to them. However, a CL70 or CT70H have taken my 15hp+ beasts no problem.

cdoublejj · 01-15-2009, 12:43 PM

howd you get the cl70 tranny?

stevec · 01-15-2009, 01:02 PM

Are CT70H same as SL70?

50rider340 · 01-15-2009, 01:07 PM

my brother and i have tried having an edge in the 88 mod class here in the north east. Both of us ran 4 speeds for the first year. From start to finish both of us ran through lifan 4 speeds 3 to be exact. My brother burned up a trx70 4 speed but i think the person who had it before him ran the bike out of oil cuz one of the gears ended up warping to the main shaft. Finally i got my hands on a ct70h 4 speed. Imediately i noticed the gears were even thinner in thickness than the trx or lifan tranny at that point i new it was just luck on how long it would last. Moto town (a hard pact track) gernades 3rd gear do to the fact that a 50 doesnt have cusions (rubber bushings like a 110 does for the rear sprocket) causeing all the force to go right into the tranny when you land.

So after all of that im back to a honda xr50 3 speed tranny, as its the strongest you can put in there.

For street use 4 speeds should be able to last no problem, on dirt id stick to a 3 speed if your huckin 40 foot tables.

TRX70 tranny

71SL70 and 71ct70h tranny

They may not look very different but trust me there is a huge difference in the thickness of the gears on a ct70h tranny compaired to any nock off 4 speed or trx704 speed. Id take pictures of the ct70h tranny i had but it blew up into so many pieces i threw it out haha.

firepower354 · 01-15-2009, 10:13 PM

I like the Tak close-ratio 3 speed for 88's

moto234 · 01-16-2009, 12:31 AM

i had one of those close ratio 3s and i didnt like it very much at all, it just didnt fit my riding style or something.

however i had an AHP 4 speed and i really liked that so i think ill give the ct gears a shot and see if they blow up on me too lol im thinking they probably wont but we'll see

fatcaaat · 01-16-2009, 07:09 AM

I agree above...if you are in the dirt racing, an older 4-speed is not the way to go. Run a 3-speed or buy a trx90 bottom to build your motor from. On the street, an older 4-speed will hold up to about a 106cc build...beyond that you are looking for trouble.

As for where to get CL70, CT70H, and TRX70 gearsets...keep your eye on ebay. If someone wants a complete H tranny, contact me...I have one, including kick shaft and gear.

moto234 · 01-16-2009, 11:29 AM

so the ct gears wouldnt be good on dirt at all but they are alright for street use? not even ok for dirt on an 88? thats weird since its only 18 more ccs than the original motor, but you guys say they are pretty skiny so i guess it makes sense. i was thinkin about it for riding in the back yard no serious racing stuff

moto234 · 01-16-2009, 10:52 PM

should i risk it or no? like i said its just for backyard riding a few hours every few weeks

firepower354 · 01-16-2009, 10:56 PM

What's the worst that could happen? Just don't land WOT

moto234 · 01-17-2009, 12:28 AM

Quote:

Originally Posted by firepower354

What's the worst that could happen? Just don't land WOT

i usually dont do that and i dont hit huge jumps anyway im a woosy after a few hospital visits lol and i dont know what happens when a tranny breaks so i dont really know whats the worst that could happen. i suppose the worst would be if i was riding by a cliff and the gears snapped and the tranny seized and i skidded of the cliff, fell 156ft. onto rocks and broken glass

01-14-2009, 09:16 PM	#1 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	ct70h tranny i was piecing together a motor and i was thinking about putting a 70h 4 speed in it but i was wondering about the strength of it. i had an ahp 4 speed in the past and i was wondering how it would compair to that from those of you who have had both. thanks for any input you have or can offer!

01-14-2009, 09:59 PM	#2 (permalink)
reynolds_brad Advertiser Join Date: Dec 2003 Location: San Francisco, CA Posts: 2,719	Re: ct70h tranny just from my own personal experiances with others that have tried it. http://www.planetminis.com/f14/why-n...4-a-15717.html __________________ pecore nere ufficiose Motoshop Z - Honda50.com

01-14-2009, 10:01 PM	#3 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny ok thanks for that and i read another from like 4 years ago that fatcaat started about old 1d3u trannys exploding gears on high power motors

01-14-2009, 10:15 PM	#4 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,999 My Mood:	Re: ct70h tranny How's the TRX70? It looks to have the same ratios and pattern as JDM Monkeys? __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

01-14-2009, 10:29 PM	#5 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny ive been reading lately about people using those or wanting to use them but i dont know anything about them. im kinda new to the mad scientist way of building engine lol what makes the gears fail? is it the way they are made (thickness, metal) or how they are ridin, or maybe a combo of both?

01-15-2009, 12:30 AM	#6 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny o and this is gonna be paired with some kind of manual clutch and an 88 with head, not sure of what im gonna use yet

01-15-2009, 10:56 AM	#7 (permalink)
cdoublejj 3rd Gear Member Join Date: Oct 2008 Location: St.Joe MO Posts: 1,367 My Mood:	Re: ct70h tranny i think the trx70 engine is pretty much the same or very similar to the ct70 engine.

01-15-2009, 11:01 AM	#8 (permalink)
fiveho 2nd Gear Member Join Date: Jan 2006 Location: indiana,pa Posts: 907	Re: ct70h tranny the trx gears are heavier

01-15-2009, 12:19 PM	#9 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny does that make them better than the ct gears?

01-15-2009, 12:39 PM	#10 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 3,778	Re: ct70h tranny CT70H and CL70 trannies are fine. It is the 1 down, 3 up older trannies that have trouble. They work fine until you put 10+hp to them. However, a CL70 or CT70H have taken my 15hp+ beasts no problem.

01-15-2009, 12:43 PM	#11 (permalink)
cdoublejj 3rd Gear Member Join Date: Oct 2008 Location: St.Joe MO Posts: 1,367 My Mood:	Re: ct70h tranny howd you get the cl70 tranny?

01-15-2009, 01:02 PM	#12 (permalink)
stevec 2nd Gear Member Join Date: Sep 2007 Posts: 422 My Mood:	Re: ct70h tranny Are CT70H same as SL70?

01-15-2009, 01:07 PM	#13 (permalink)
50rider340 3rd Gear Member Join Date: Mar 2004 Location: CT Posts: 3,083 My Mood:	Re: ct70h tranny my brother and i have tried having an edge in the 88 mod class here in the north east. Both of us ran 4 speeds for the first year. From start to finish both of us ran through lifan 4 speeds 3 to be exact. My brother burned up a trx70 4 speed but i think the person who had it before him ran the bike out of oil cuz one of the gears ended up warping to the main shaft. Finally i got my hands on a ct70h 4 speed. Imediately i noticed the gears were even thinner in thickness than the trx or lifan tranny at that point i new it was just luck on how long it would last. Moto town (a hard pact track) gernades 3rd gear do to the fact that a 50 doesnt have cusions (rubber bushings like a 110 does for the rear sprocket) causeing all the force to go right into the tranny when you land. So after all of that im back to a honda xr50 3 speed tranny, as its the strongest you can put in there. For street use 4 speeds should be able to last no problem, on dirt id stick to a 3 speed if your huckin 40 foot tables. TRX70 tranny 71SL70 and 71ct70h tranny They may not look very different but trust me there is a huge difference in the thickness of the gears on a ct70h tranny compaired to any nock off 4 speed or trx704 speed. Id take pictures of the ct70h tranny i had but it blew up into so many pieces i threw it out haha. Last edited by 50rider340; 01-15-2009 at 01:19 PM.

01-15-2009, 10:13 PM	#14 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,999 My Mood:	Re: ct70h tranny I like the Tak close-ratio 3 speed for 88's __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

01-16-2009, 12:31 AM	#15 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny i had one of those close ratio 3s and i didnt like it very much at all, it just didnt fit my riding style or something. however i had an AHP 4 speed and i really liked that so i think ill give the ct gears a shot and see if they blow up on me too lol im thinking they probably wont but we'll see

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

01-16-2009, 07:09 AM	#16 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 3,778	Re: ct70h tranny I agree above...if you are in the dirt racing, an older 4-speed is not the way to go. Run a 3-speed or buy a trx90 bottom to build your motor from. On the street, an older 4-speed will hold up to about a 106cc build...beyond that you are looking for trouble. As for where to get CL70, CT70H, and TRX70 gearsets...keep your eye on ebay. If someone wants a complete H tranny, contact me...I have one, including kick shaft and gear.

01-16-2009, 11:29 AM	#17 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny so the ct gears wouldnt be good on dirt at all but they are alright for street use? not even ok for dirt on an 88? thats weird since its only 18 more ccs than the original motor, but you guys say they are pretty skiny so i guess it makes sense. i was thinkin about it for riding in the back yard no serious racing stuff Last edited by moto234; 01-16-2009 at 10:51 PM.

01-16-2009, 10:52 PM	#18 (permalink)
moto234 3rd Gear Member Join Date: Apr 2008 Location: CHICO CA Ukiah CA MENDO 707 Posts: 2,782	Re: ct70h tranny should i risk it or no? like i said its just for backyard riding a few hours every few weeks

01-16-2009, 10:56 PM	#19 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 10,999 My Mood:	Re: ct70h tranny What's the worst that could happen? Just don't land WOT __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.