Planet Minis

fatcaaat · 05-14-2008, 08:34 AM

Well, it seems no one has the bank for my ST90 and it is such a shame to have it sit here in the garage.

So, I am going to take the 153cc Jialing motor out of it and pop one in of standard configuration (with a 49cc stamped cylinder). This way it can be used as a scooter in VA without tagging it.

So, this bike is pretty light and its been a good while since we've talked about the smaller motors.

What do you think is a good cruising speed to aim for with the following motor sizes? Also, maybe some help with gearing to achieve this?

70cc
88cc
95cc
108cc (stroker)

My guesses?
70cc - 40
88cc - 45
95cc - 50
108cc - 55 (stroker)

firepower354 · 05-14-2008, 10:32 AM

Sounds accurate.

fastbmw · 05-14-2008, 11:31 AM

pretty bang on. My 88cc does about 47-ish

shawnbassett26 · 05-14-2008, 02:22 PM

chriswilders, zb50 with a stroker 100, weve got up 70MPH 15t/35t
~Shawn

RcWannabe · 05-14-2008, 02:26 PM

I think a stock 70cc engine would be more comfortable in the 35 range, you might get 40 but the tall gearing might make it not so fun to get going.

firepower354 · 05-14-2008, 02:29 PM

Stock? Hah!

50rider340 · 05-14-2008, 02:39 PM

i got a c70 with just a pod filter and a homade pipe that really flows (i grinded off the 72ccs so i dont have to worry about tags here in CT either. On the flats with my skinny ass on it (130lbs) i get 40 all the time down hill i tach the speedo out at 55. Keep in mind the larger wheels prolly help out alot for my speeds. It is a 3 speed n up hills i get 30-35 depending on steep it is.

What tranny would you plan on useing the stock 3 speed?

Tagless bikes are where its at right now. 60+mpg with gas at 4 bucks i ride it everywhere

Id stick with the 88cc mark. That way you dont burn up to much fuel.

1TrikZB · 05-14-2008, 03:13 PM

My 1968 Honda CT90 maintained 57 mph GPS confirmed. I have a stock exhaust, but a tweeked carb and points setup.

fatcaaat · 05-14-2008, 03:28 PM

Well, what I am going for here is what type of speed should i expect without the worry of the motor coming apart. Certainly I can't run a motor like this at 10k for 30 minutes straight. So, it is ok to expect to run it at 7k? Could I go 55-60 mph at 7k on a 108cc motor in this bike or is it more reasonable to go 45-50?

Top speed not really a concern...max sustainable where we don't have to worry about the motor coming apart is what I'm after.

RcWannabe · 05-14-2008, 03:40 PM

Quote:

Originally Posted by fatcaaat

Top speed not really a concern...max sustainable where we don't have to worry about the motor coming apart is what I'm after.

Exactly, that is my train of thought behind my other response. 7 thousand rpm would be a good cruising speed I think. If I was to build a street bike I would definetly go for the stroker crank so I could run the tall gear but still have some get up and go. With the 108 I think you could get 50+ mph without too many r's.

damageinc2785 · 05-15-2008, 06:31 AM

do they really look at the cc's on the engine?
i've never had anyone look at that, just whats on the title/reg.

fatcaaat · 05-15-2008, 08:18 AM

in VA you don't require title/reg for a scooter. in VA it is 49cc that qualifies as a scooter that doesn't need reg/title/license...or inspection.

damageinc2785 · 05-15-2008, 10:18 AM

here in ny you have to register and inspect and insure it if its over like 25mph i think
but you can drive it with a permit i think.

05-14-2008, 08:34 AM	#1 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,976	Max sustainable speed: 85, 88, 95cc? Well, it seems no one has the bank for my ST90 and it is such a shame to have it sit here in the garage. So, I am going to take the 153cc Jialing motor out of it and pop one in of standard configuration (with a 49cc stamped cylinder). This way it can be used as a scooter in VA without tagging it. So, this bike is pretty light and its been a good while since we've talked about the smaller motors. What do you think is a good cruising speed to aim for with the following motor sizes? Also, maybe some help with gearing to achieve this? 70cc 88cc 95cc 108cc (stroker) My guesses? 70cc - 40 88cc - 45 95cc - 50 108cc - 55 (stroker)

05-14-2008, 10:32 AM	#2 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,266	Re: Max sustainable speed: 85, 88, 95cc? Sounds accurate.

05-14-2008, 11:31 AM	#3 (permalink)
fastbmw 2nd Gear Member Join Date: Sep 2005 Posts: 604	Re: Max sustainable speed: 85, 88, 95cc? pretty bang on. My 88cc does about 47-ish

05-14-2008, 02:22 PM	#4 (permalink)
shawnbassett26 2nd Gear Member Join Date: Feb 2008 Location: Orlando FL Posts: 678	Re: Max sustainable speed: 85, 88, 95cc? chriswilders, zb50 with a stroker 100, weve got up 70MPH 15t/35t ~Shawn

05-14-2008, 02:26 PM	#5 (permalink)
RcWannabe 3rd Gear Member Join Date: May 2006 Location: Pennsylvania Posts: 7,414	Re: Max sustainable speed: 85, 88, 95cc? I think a stock 70cc engine would be more comfortable in the 35 range, you might get 40 but the tall gearing might make it not so fun to get going.

05-14-2008, 02:29 PM	#6 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,266	Re: Max sustainable speed: 85, 88, 95cc? Stock? Hah!

05-14-2008, 02:39 PM	#7 (permalink)
50rider340 3rd Gear Member Join Date: Mar 2004 Location: CT Posts: 2,102	Re: Max sustainable speed: 85, 88, 95cc? i got a c70 with just a pod filter and a homade pipe that really flows (i grinded off the 72ccs so i dont have to worry about tags here in CT either. On the flats with my skinny ass on it (130lbs) i get 40 all the time down hill i tach the speedo out at 55. Keep in mind the larger wheels prolly help out alot for my speeds. It is a 3 speed n up hills i get 30-35 depending on steep it is. What tranny would you plan on useing the stock 3 speed? Tagless bikes are where its at right now. 60+mpg with gas at 4 bucks i ride it everywhere Id stick with the 88cc mark. That way you dont burn up to much fuel.

05-14-2008, 03:13 PM	#8 (permalink)
1TrikZB 2nd Gear Member Join Date: Dec 2005 Location: JackSonville, Fl Posts: 855 Awards Showcase Total Awards: 1	Re: Max sustainable speed: 85, 88, 95cc? My 1968 Honda CT90 maintained 57 mph GPS confirmed. I have a stock exhaust, but a tweeked carb and points setup.

05-14-2008, 03:28 PM	#9 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,976	Re: Max sustainable speed: 85, 88, 95cc? Well, what I am going for here is what type of speed should i expect without the worry of the motor coming apart. Certainly I can't run a motor like this at 10k for 30 minutes straight. So, it is ok to expect to run it at 7k? Could I go 55-60 mph at 7k on a 108cc motor in this bike or is it more reasonable to go 45-50? Top speed not really a concern...max sustainable where we don't have to worry about the motor coming apart is what I'm after.

05-15-2008, 06:31 AM	#11 (permalink)
damageinc2785 1st Gear Member Join Date: Feb 2008 Location: huntington, LI, NY Posts: 183	Re: Max sustainable speed: 85, 88, 95cc? do they really look at the cc's on the engine? i've never had anyone look at that, just whats on the title/reg.

05-15-2008, 08:18 AM	#12 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,976	Re: Max sustainable speed: 85, 88, 95cc? in VA you don't require title/reg for a scooter. in VA it is 49cc that qualifies as a scooter that doesn't need reg/title/license...or inspection.

05-15-2008, 10:18 AM	#13 (permalink)
damageinc2785 1st Gear Member Join Date: Feb 2008 Location: huntington, LI, NY Posts: 183	Re: Max sustainable speed: 85, 88, 95cc? here in ny you have to register and inspect and insure it if its over like 25mph i think but you can drive it with a permit i think.

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