Author Topic: Batboy  (Read 236 times)

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Offline Lee

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Batboy
« on: August 31, 2019, 04:42:03 pm »
While batboy plays with his 36mm carb conversion. Wondering if any one went opposite to 30mm to further detune a C10 and maybe get better fuel economy? Also 34mm might be a thought for easier jetting due to less of a jump in airflow.

Anyone gone low or high or have thoughts on such. Would not attempt either save for having carbs on hand and a bad set of 32mm
on bike that need replacing would think.

Has any such been done before?

Offline batboy

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Re: Batboy
« Reply #1 on: August 31, 2019, 05:06:41 pm »
Please remember, other people did the 36mm long before me.

I've wondered how the 34mm carbs would work (ZL1000 and GPZ900R). My gut feeling they would work nice. I just have never heard of anyone putting one on a Connie. Didn't the ZL1000 have about 10 HP more than the C-10? I've heard of some of the early 34mm carbs having a single throttle cable. You would not want that, you'd want to look for the push/pull dual throttle cable setup.
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Offline Lee

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Re: Batboy
« Reply #2 on: August 31, 2019, 05:22:28 pm »
Just used your handle in heading as you have been receiving lots of comments on the 36mm project. Did not want to post to your thread as felt might be unrelated and distracting. Highjack think they call it.

Am hopeful some of those who have been there done that might have comment in a new thread. I have enjoyed your thread posts on 36mm. Lots of good overlapping info there!

The 900 30mm carbs have been interesting to me for gas milage possibilities. I hardly us my C10's powerband as is with 32mm carbs.

Offline connie_rider

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Re: Batboy
« Reply #3 on: August 31, 2019, 06:24:44 pm »
I had 34's or 36's on one of my C-10's and went back to 32's.
Reasons;
1} I had problems with the bigger carbs.
2} I felt that the 32's gave me better low end / midrange response.

To do 30's you would have to go thru many of the things he's going thru.
  Biggest issue being to find some with the correct spacing and openings that fit existing rubber pieces.
  Next would be rebuilding etc...
Would be better to work the jetting over on your 32's.

Either way, you might or might not get better mileage..

Ride safe, Ted

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Offline bajasam

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Re: Batboy
« Reply #4 on: August 31, 2019, 08:16:13 pm »
Those 30's might be the ticket if those cams from the florida steve were still made, I think he had the right idea combining both carb and cam tune for more usable rpm band, I dont think I've ever been over 7K rpm anyway,extra mileage would just be icing on the cake. 

Offline batboy

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Re: Batboy
« Reply #5 on: August 31, 2019, 08:41:02 pm »
For economy and drivability, I'd stay with the 32mm also. They are more common if you need parts and cheaper too.
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Offline Lee

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Re: Batboy
« Reply #6 on: September 01, 2019, 09:03:14 am »
Was thinking one of the C10's 900cc predessors would provide likely source of 30mm parts Ted. But I have little info besides comments here to go on.

Since I now have a parts C10, always pipe dreaming of ways to experimet with it. Batboy's project and his tread stimulates "what if" possibilities. Especaily with the C10 being a "parts bin" creation by Kawasaki.

Notice some non US market C10s have a slide restictor to prevent WOT. But that would not help gas milage if one never opens throttle anyway.

Yes playing with jetting leaner of stock 32mm would seem best practice. Both of my carb banks are on 130 mains. Would like to go to 122.5 or 120 with one to experiment with fuel economy.

Know from reading here that is a recommended practice by some for torque and general performance increase.

Offline connie_rider

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Re: Batboy
« Reply #7 on: September 01, 2019, 01:03:33 pm »
None of the ZX-900's had a 30. The old KZ 900 might have, but that is an entirely different engine and cylinder spacing/mounts are probably not the same.
If you want to improve mileage and driveability,,, Steve's carb rebuild with a 2 min jett kit will help, but not cheap e'nuf to do it just for fuel mileage alone. The whole carb job does increase torque and {more importantly} add's a stand pipe.
.
Another GREAT option would be to install his cam sprocket. Not expensive and will increase torque.
    Better low end torque "will" improve mileage...

I am not a jetting specialist. Batboy's efforts are showing a lot. {more than I've seen previously}
 Smaller main jets can help mileage, but don't go too lean as that hurts mileage and can burn up an engine.
 The needles will have more influence on mileage,  as they control fuel flow/atomization at low throttle openings.
     A stock Connie Needle looks like a nail. Not much taper...
     Finding some better needles and installing them would help a lot.
       But, I have no idea which ones would be more appropriate.

Ride safe, Ted
« Last Edit: September 02, 2019, 01:37:14 pm by connie_rider »
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Offline batboy

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Re: Batboy
« Reply #8 on: September 01, 2019, 01:29:11 pm »
Lee, you have 130 main jets in your stock 32mm carbs? Is that Keihin jets? I thought the OEM main jet was 125? Oh, maybe you have California carbs, I think they were 130 if I remember correctly.

Here's one factor that I almost never see discussed is elevation. That definitely affects jetting. Jets that work fine near sea level down in Florida will not be right for someone in mile high Denver. I'm at about 1400 feet elevation here. Maybe we should include elevation info when talking about jets sizes?
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Offline bajasam

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Re: Batboy
« Reply #9 on: September 01, 2019, 09:50:23 pm »
Does'nt make much difference, every bike I have had runs 1-2 sizes bigger pilot and main jets,and at 2000' to over 9500' there is no noticeable difference in engine performance. Over on the ADV bike forum those guys who ride all the CO mountain passes at 12-14000' report they have no issues other than a slight decrease in power,but bike runs and behaves normally.There's an upcoming COG ride this month in Az that tops out at 9100' and none of those guys report any problems.

Offline Lee

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Re: Batboy
« Reply #10 on: September 02, 2019, 12:16:22 am »
Batboy am at about the 200 ft elevation on the old prehistoric beach front in North Louisana. Yeah both my carb banks are using 130 mains. I forget the other jets have it recorded somewhere. Both banks are origional. Yes elevation is important.

Ted thanks for toughts on taper. Had no idea it was nail like. Does Steve's 2 min kit change the needles? My bad for some reason I was confused thinking the 1984 GPZ900R had 30mm carbs. But they are 34mm. What was I thinking?