Planet Minis

lilskully · 08-22-2008, 01:48 PM

I just completed an 88cc build on 04CRF 50 motor, using Trail bikes 88cc cylinder kit. I ran 1 race using the stock head and intake/carb set-up. I got great torque, but top-end was about the same.
A local racer is getting out of minis, and I bought his Trailbikes race head, and BBR exhaust. I also got a Keihn 20mm carb, and Mikuni 24mm carb.

My question. for the Trailbikes 88 piston, ported/polished race head, and BBR exhaust, which carb is the better choice...the 20mm Keihn or the 24mm Mikuni?

Thanks in advance,
Dan da man

mototim · 08-22-2008, 01:49 PM

I ran the 24mm when i had that setup on my 50

matty88 · 08-22-2008, 01:53 PM

id run the 20mm 24 sounds a little big

infidel · 08-22-2008, 02:01 PM

20m.m 24 is too big for a tb 88 a 22 would be ideal though

lilskully · 08-22-2008, 02:59 PM

You guys rock! Thanks for the suggestions.

firepower354 · 08-22-2008, 07:06 PM

Is the Mik 24mm a "real" round venturi 24mm or an eBay special 18x24 oval?

Pimpindahoes · 08-22-2008, 07:10 PM

Quote:

Originally Posted by matty88

id run the 20mm 24 sounds a little big

for girls maybe.

no but seriously if you have the race head go with a 24mm carb.

Pimpindahoes · 08-22-2008, 07:10 PM

Quote:

Originally Posted by infidel

20m.m 24 is too big for a tb 88 a 22 would be ideal though

can u say trippin?

Pimpindahoes · 08-22-2008, 07:11 PM

Quote:

Originally Posted by lilskully

You guys rock! Thanks for the suggestions.

carefull what advice you take from this site. Most dont know their a$s from their head.

lilskully · 08-23-2008, 09:43 AM

Quote:

Originally Posted by firepower354

Is the Mik 24mm a "real" round venturi 24mm or an eBay special 18x24 oval?

I guess it is an e-bay knock-off...it does measure oval. Is that the tell-tale way of knowing the difference?

"Pimpindahoes" You recommend using the 24 with the race head. Bear in mind this could be a knock-off mikuni, what jetting do you recommend? This question is also aimed at anyone in the know.

infidel · 08-23-2008, 09:50 AM

Quote:

Originally Posted by Pimpindahoes

can u say trippin?

can you say no low end ? and over kill for the tiny tb valves? he has a bolted together motor the quench isn't right and it has no porting. a 24 is a stupid choice for that motor.

Pimpindahoes · 08-23-2008, 10:49 AM

Quote:

Originally Posted by infidel

can you say no low end ? and over kill for the tiny tb valves? he has a bolted together motor the quench isn't right and it has no porting. a 24 is a stupid choice for that motor.

suit yourself.....

ive been building motors since 2003. 24mm on a 88cc race head is the ONLY way to go if you want the most bottom end and top end power.....

PERIOD

not sure on the jetting. if you can describe very well what the bike does and at what throttle position then i can troubleshoot with you and steer you in the right direction. trial and error.

firepower354 · 08-23-2008, 11:01 AM

I'd sell both carbs and buy a real 24mm round bore Mik or Keihin, provided the head was actually ported and not just shined up. The TB head leaves plenty to be desired, as far as port design goes.

Pimpindahoes · 08-23-2008, 11:07 AM

Quote:

Originally Posted by firepower354

I'd sell both carbs and buy a real 24mm round bore Mik or Keihin, provided the head was actually ported and not just shined up. The TB head leaves plenty to be desired, as far as port design goes.

at least im not the only one giving the proper advice.

Tunk31x · 08-23-2008, 02:49 PM

i ran a 24mm on my race head ported and polished, with an 80 main jet, needle in the center, runs tip top, bullet proof. end of story

lilskully · 08-23-2008, 05:17 PM

I test ran the 20mm today, and it runs great at top end. Idle is good. Just off idle it stumbles a little if I rap the throttle quickly. Mid range is good, but again if I rap it open from there, it stumbles slightly. Sometimes coming to a stop quicly kills it.
Correct me if I'm wrong,
If it's good at top end, the main is ok.
The stmble low and mid needs the needle raised.
Dieing after stoping quick from high rpm..I don't know...

I will try the 24mm sometime this coming week, for comparison. I don't think it can hurt.

50WHIP · 08-23-2008, 07:41 PM

Find a 22 keihen and I would put money on it being the best from bottom to top end power.I've ran them all and only need a 24mm on my superhead 115 and trailbikes 117 and trust me they are plenty big.

Pimpindahoes · 08-23-2008, 07:56 PM

no its your pilot circuit that isnt tuned right. the needle is mid throttlle.

does it pop on decel?

lilskully · 08-24-2008, 12:05 AM

Quote:

Originally Posted by Pimpindahoes

does it pop on decel?

Oh yes it pops! Pretty loud too.

Pimpindahoes · 08-24-2008, 07:50 AM

Quote:

Originally Posted by lilskully

Oh yes it pops! Pretty loud too.

go up one on your pilot. you should be golden after that.

Matt

08-22-2008, 01:48 PM	#1 (permalink)
lilskully PM Newbie Join Date: Aug 2008 Posts: 51	Carb choice for 88cc race motor I just completed an 88cc build on 04CRF 50 motor, using Trail bikes 88cc cylinder kit. I ran 1 race using the stock head and intake/carb set-up. I got great torque, but top-end was about the same. A local racer is getting out of minis, and I bought his Trailbikes race head, and BBR exhaust. I also got a Keihn 20mm carb, and Mikuni 24mm carb. My question. for the Trailbikes 88 piston, ported/polished race head, and BBR exhaust, which carb is the better choice...the 20mm Keihn or the 24mm Mikuni? Thanks in advance, Dan da man

08-22-2008, 01:49 PM	#2 (permalink)
mototim 2nd Gear Member Join Date: Sep 2007 Location: so cal Posts: 338	Re: Carb choice for 88cc race motor I ran the 24mm when i had that setup on my 50

08-22-2008, 01:53 PM	#3 (permalink)
matty88 2nd Gear Member Join Date: Jan 2008 Location: ontario canada f@ckin eh!! Posts: 616	Re: Carb choice for 88cc race motor id run the 20mm 24 sounds a little big

08-22-2008, 02:01 PM	#4 (permalink)
infidel 3rd Gear Member Join Date: Mar 2007 Location: houston texas Posts: 1,123	Re: Carb choice for 88cc race motor 20m.m 24 is too big for a tb 88 a 22 would be ideal though

08-22-2008, 02:59 PM	#5 (permalink)
lilskully PM Newbie Join Date: Aug 2008 Posts: 51	Re: Carb choice for 88cc race motor You guys rock! Thanks for the suggestions.

08-22-2008, 07:06 PM	#6 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,266	Re: Carb choice for 88cc race motor Is the Mik 24mm a "real" round venturi 24mm or an eBay special 18x24 oval?

08-23-2008, 11:01 AM	#13 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,266	Re: Carb choice for 88cc race motor I'd sell both carbs and buy a real 24mm round bore Mik or Keihin, provided the head was actually ported and not just shined up. The TB head leaves plenty to be desired, as far as port design goes.

08-23-2008, 02:49 PM	#15 (permalink)
Tunk31x PM Newbie Join Date: Aug 2008 Location: Spokane,WA Posts: 9	Re: Carb choice for 88cc race motor i ran a 24mm on my race head ported and polished, with an 80 main jet, needle in the center, runs tip top, bullet proof. end of story

08-23-2008, 05:17 PM	#16 (permalink)
lilskully PM Newbie Join Date: Aug 2008 Posts: 51	Re: Carb choice for 88cc race motor I test ran the 20mm today, and it runs great at top end. Idle is good. Just off idle it stumbles a little if I rap the throttle quickly. Mid range is good, but again if I rap it open from there, it stumbles slightly. Sometimes coming to a stop quicly kills it. Correct me if I'm wrong, If it's good at top end, the main is ok. The stmble low and mid needs the needle raised. Dieing after stoping quick from high rpm..I don't know... I will try the 24mm sometime this coming week, for comparison. I don't think it can hurt.

08-23-2008, 07:41 PM	#17 (permalink)
50WHIP 3rd Gear Member Join Date: Apr 2005 Location: INDIANA PA. Posts: 1,066	Re: Carb choice for 88cc race motor Find a 22 keihen and I would put money on it being the best from bottom to top end power.I've ran them all and only need a 24mm on my superhead 115 and trailbikes 117 and trust me they are plenty big.

08-23-2008, 07:56 PM	#18 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 9,969 Awards Showcase Total Awards: 1	Re: Carb choice for 88cc race motor no its your pilot circuit that isnt tuned right. the needle is mid throttlle. does it pop on decel?

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