Cross over intake fail - Page 2 - Kawasaki ATV Forum
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post #11 of 29 Old 02-11-2015, 02:57 PM
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Here is where mine cracked.

uploadfromtaptalk1423695882673.jpguploadfromtaptalk1423695899409.jpg

...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

'05 BF730 SRA

'04 Prairie 700
...
...
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post #12 of 29 Old 02-11-2015, 02:59 PM
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What I found is that the 1/4" thick spacers that most are using with the 36mm intakes are not thick enough. They should really be 5/16" thick. With only 1/4 spacers, the intakes stretch too much.

Are your intakes for stock carbs or 36mm carbs?

...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

'05 BF730 SRA

'04 Prairie 700
...
...
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post #13 of 29 Old 02-11-2015, 07:18 PM Thread Starter
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Mine are for stock carbs.


LOONEY TUNED FST 765
LOONEY TUNED KFX450R (SOLD)



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post #14 of 29 Old 02-11-2015, 07:44 PM
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I will have to check mine sometime. My 700 has UPP crossover intakes on it.

...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

'05 BF730 SRA

'04 Prairie 700
...
...
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post #15 of 29 Old 02-11-2015, 07:48 PM
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Probably would never have that problem with the homemade ones done with Windo Weld. The area that cracked never gets touched when making them.

uploadfromtaptalk1423713363342.jpguploadfromtaptalk1423713376959.jpg

...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

'05 BF730 SRA

'04 Prairie 700
...
...
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post #16 of 29 Old 02-12-2015, 01:04 AM Thread Starter
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Yeah I sold the ones I made and fitted this orange junk, Sonic on here bought them and as far as I know they are still going strong....live and learn. But yes I would definitely check the UPP ones periodically to be on the safe side.


LOONEY TUNED FST 765
LOONEY TUNED KFX450R (SOLD)



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post #17 of 29 Old 02-12-2015, 05:00 AM
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Did you get your orange ones used? They look pretty old. I think mine are red.

...
'04 KFX800
DSC 12:1 Pistons w/ Stg 2 cams, Ported Heads, 36mm carbs, Muzzy Super Pro, Dual MTX-L, VFJ Stg 3 Spidermod Clutch & Adj. Weights, +8 Swing Arm, Elka Shocks, 24" 14-paddle Staggered SLS Ripper paddles, BOSS NOSS 40-shot

'04 KFX730
Custom 84mm 12:1 JE Pistons w/ FST Stg 2 cams, Muzzy Super Pro, UPP Crossover Intakes, 8* Timing Key, Elka Shocks, +4 Swing Arm Extension, 24" 10-paddle Skat-Trak Extremes

'04 KFX730
Wiseco 84mm 11.5:1 Pistons w/ Fundy Trail/Race cams, Muzzy Super Pro, Crossover Intakes, 6* Timing Key, Works front & Elka Rear Shocks, +4 Swing Arm Extension, 24" 9-paddle Skat-Trak Extremes

'05 BF730 SRA

'04 Prairie 700
...
...
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post #18 of 29 Old 02-12-2015, 12:30 PM Thread Starter
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Nope brand new never fitted before I got them from a member on here. Prob about 3yrs ago.

Anyway I wasn't aware of any problems with them that's why I posted here asking John if he had heard of any. The main aim was to let others know so they can check theirs before any damage is done.


LOONEY TUNED FST 765
LOONEY TUNED KFX450R (SOLD)



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post #19 of 29 Old 02-12-2015, 05:00 PM
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If you think that caused your burnt valve it's more then likely your own fault for riding it. I would think it would run poorly and backfire a lot..

04 kfx 700..been hauling yamaha out of the woods almost every weekend since march of 2003

Drag racing is for fags who cant dodge trees!
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post #20 of 29 Old 02-12-2015, 05:39 PM Thread Starter
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If you read the whole thread you will see that I said my son has been riding it and was complaining that it was hard to start. He never said anything about it backfiring. I thought it just needed the valve clearance set, when I got around to doing it that's when I found the problem with one intake valve, pulled the head and discovered the intake had failed. Last time I rode it a few weeks ago it ran fine but like I said the way the intake is one piece you couldn't even notice it until it was off the motor. There was some dust in there so yes it was the reason the valve was trashed. Was it my fault? Hardly, I never made the intake! Anyway that's besides the point, the reason for posting as stated earlier is to see if John had heard of any others and to let other members know to maybe check theirs just incase.


LOONEY TUNED FST 765
LOONEY TUNED KFX450R (SOLD)



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