Crossover intake - Kawasaki ATV Forum
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post #1 of 8 Old 11-07-2016, 04:36 AM Thread Starter
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Crossover intake

Hey guys,

What are the benefits with those crossover intakes on a stock engine with dual pipes?

No need to sync carbs anymore?
Will it run smoother?
What about backfiring thru the carbs when cold (can't get it fixed), would this mod help in any way?

I now have stock pilot jets and main 140/145.
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post #2 of 8 Old 11-07-2016, 11:55 AM
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Need to know what machine is it what exhaust is on it. First

2010 duramax built trans twin turbo injectors 674hp/1421tq
2006 ltr450/535 14.25:1 big bore kit ATP cams ported head +1 valves
2004 v-force 12 hole mod twin air intake kit muzzy super pro 10 degree key stage 3 spider mod clutch
2007 BF750 28 cst wild thangs 14 sti hd4 cdi box ehs lid muzzy duals stg 3 spider mod clutch with vfj #1 primary and secondary springs GP shocks Next mod 800 kit and cams
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post #3 of 8 Old 11-07-2016, 12:08 PM Thread Starter
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What machine it is??
You do know that this is the KFX-700 forum?

I have a dual Krieger competition exhaust.....
I am not going for extra hp, just want the engine to run as smooth as possible
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post #4 of 8 Old 11-07-2016, 01:14 PM
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It will add power, but will not run smoother; it will run a little rougher.
Have you added any shims to the needles in the carbs? The backfiring through the carbs means it's lean.
Basic carbed engine theory:
If the engine is cold, expect it to run rough if you try to drive it without using the choke.
If it runs a little rough when cold, but runs good after it's warmed up for a few minutes, then there is no problem.
If you try to tune it so it runs smooth when cold and you don't want to use the choke, then it will be too rich when warm.

2002 698 Prairie
VFJ 11.5:1 coated pistons
FST Stage II Cams
Fundy Performance Porting, 1mm milled off heads
Kibblewhite valves
Crossover intakes
Modded airbox
Full Muzzy
Custom machined stock weights
VFJ Springs
DynaTek CDI
Other weird stuff

2011 Stratos 186XT Bass Boat
Mercury Optimax 115hp
Minn Kota 70lb 24v trolling motor
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post #5 of 8 Old 11-07-2016, 10:17 PM Thread Starter
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Ok well.... Then maybe i just need 1 size bigger on the pilot jet........ Even when the engine is warm i still have some minor backfiring....
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post #6 of 8 Old 11-08-2016, 02:20 AM
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Ok well.... Then maybe i just need 1 size bigger on the pilot jet........ Even when the engine is warm i still have some minor backfiring....
You didn't answer the shim question.
Go up one size on the pilot jet. And open the pilot screws.

2002 698 Prairie
VFJ 11.5:1 coated pistons
FST Stage II Cams
Fundy Performance Porting, 1mm milled off heads
Kibblewhite valves
Crossover intakes
Modded airbox
Full Muzzy
Custom machined stock weights
VFJ Springs
DynaTek CDI
Other weird stuff

2011 Stratos 186XT Bass Boat
Mercury Optimax 115hp
Minn Kota 70lb 24v trolling motor
Lowrance HDS 10 Electronics
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post #7 of 8 Old 11-08-2016, 07:28 AM Thread Starter
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Quote:
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Quote:
Originally Posted by Gmember View Post
Ok well.... Then maybe i just need 1 size bigger on the pilot jet........ Even when the engine is warm i still have some minor backfiring....
You didn't answer the shim question.
Go up one size on the pilot jet. And open the pilot screws.
Sorry your right, i have already shimmed both needles ......, pilot screws are 2,5 turns out, and already tinkered with that without any improvement
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post #8 of 8 Old 11-08-2016, 12:16 PM
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Quote:
Originally Posted by Gmember View Post
Quote:
Originally Posted by NovaKaw650 View Post
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Originally Posted by Gmember View Post
Ok well.... Then maybe i just need 1 size bigger on the pilot jet........ Even when the engine is warm i still have some minor backfiring....
You didn't answer the shim question.
Go up one size on the pilot jet. And open the pilot screws.
Sorry your right, i have already shimmed both needles ......, pilot screws are 2,5 turns out, and already tinkered with that without any improvement
You can go as far as 3.5 turns. Any more than 3.5 doesn't add more fuel.

2002 698 Prairie
VFJ 11.5:1 coated pistons
FST Stage II Cams
Fundy Performance Porting, 1mm milled off heads
Kibblewhite valves
Crossover intakes
Modded airbox
Full Muzzy
Custom machined stock weights
VFJ Springs
DynaTek CDI
Other weird stuff

2011 Stratos 186XT Bass Boat
Mercury Optimax 115hp
Minn Kota 70lb 24v trolling motor
Lowrance HDS 10 Electronics
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