Carb Conversion - Club700XX - Honda TRX700XX Forum
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post #1 of 57 Old 04-26-2011, 03:05 PM Thread Starter
 
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Carb Conversion

This is an idea , I was looking into over the Christmas holidays last year.
Over than weight saving , Is there any gains to be had using a carb system instead of the efi system ?
This would involve differant (lighter) flywheel ,ignition system and wiring loom.

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Last edited by Baxter; 04-26-2011 at 03:07 PM.
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post #2 of 57 Old 04-26-2011, 03:44 PM
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I think it is mostly used for drag racing as they have better throttle response and in the case of the raptor the ECU has the ignition control that holds the rappy up in very big builds and above like 8500 rpms. This can also save a lot of weight including the smaller tank for drag racing. DL700 has a kit for the raptor I think. Easier to tune carbs if you have the know how too.

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post #3 of 57 Old 04-26-2011, 04:59 PM
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One benefit would be getting rid of that annoying jump in fuel when you put your thumb on the throttle.

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post #4 of 57 Old 04-26-2011, 08:07 PM
 
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Better flow for the same bore because of no butterfly in the way

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post #5 of 57 Old 04-26-2011, 11:38 PM
 
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one main advantage would be the the ignition system... unlimited adjustability and unlimited rpm potential, and a way hotter spark, a ton less wiring for sure. Flywheel modification is $200 or its possible that a XR flywheel may work (gotta look at em side by side)

MSD CDI and Coil is about $400
most carbs are around $500 new

intake configuration could stay in place

44 mm Lectron or 44 FCr or TM would be nice l... maybe a 48 tm or LECTRON


Wiring in the MSD is simple but not for everyone

It will make more power when done


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post #6 of 57 Old 04-27-2011, 12:00 AM
 
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Quote:
Originally Posted by DL700 View Post
one main advantage would be the the ignition system... unlimited adjustability and unlimited rpm potential, and a way hotter spark, a ton less wiring for sure. Flywheel modification is $200 or its possible that a XR flywheel may work (gotta look at em side by side)

MSD CDI and Coil is about $400
most carbs are around $500 new

intake configuration could stay in place

44 mm Lectron or 44 FCr or TM would be nice l... maybe a 48 tm or LECTRON


Wiring in the MSD is simple but not for everyone

It will make more power when done
Guess I know what we are doing after the stroker crank.

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post #7 of 57 Old 04-27-2011, 06:46 AM
 
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Quote:
Originally Posted by DL700 View Post
one main advantage would be the the ignition system... unlimited adjustability and unlimited rpm potential, and a way hotter spark, a ton less wiring for sure. Flywheel modification is $200 or its possible that a XR flywheel may work (gotta look at em side by side)

MSD CDI and Coil is about $400
most carbs are around $500 new

intake configuration could stay in place

44 mm Lectron or 44 FCr or TM would be nice l... maybe a 48 tm or LECTRON


Wiring in the MSD is simple but not for everyone

It will make more power when done
I've looked at the flywheel and crank difference, There's quite a bit difference in them. Anything is possible but I wouldn't find making the XR flywheel fit feasible.

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post #8 of 57 Old 04-27-2011, 08:46 AM
 
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i have mixed feeling about carbs i think if you can have a efi system that you can control completly there isnt much comparison but if there is no way to control then you can have a leg up with a carb. Carbs are generally a little easier to tune but you cant make them as precise as a efi system and with out some good knowledge (same with efi) you wont be able to tune to there potential.

i prefer efi personally

i think properly done efi will make more than a carb but it is easier to put a carb on and make power on a larger build where the tb starts to get maxed


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post #9 of 57 Old 04-27-2011, 12:37 PM
 
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we wend Down 2+ mm from (a very effiently running) EFI tb. to the carb we use on the raptor and picked up 3% more hp...

unless u use a FLAT SLIDE throttle body there will always be power losses from the efi due the the plate and shaft.


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post #10 of 57 Old 04-27-2011, 01:50 PM
 
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Any where you go people will have there preference. Carbs and EFI both have advantages, It's useless to bicker about it.

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