sounds like marbles in my top end

blaster240R · 09-25-2009, 07:27 PM

i have a 240 vitos big bore with a 35 pwk carb. at 3/4 to full throttle after 3rd gear i get this noise in my top end that sounds like preignition but slightly diff. when the noise gets really bad engine will stall. it will refire and noise will be gone until i do as described above. i also notice alot of unbunt gas/oil on my a-arms and exhaust flange. when its in neutral i can rev it completely out with no noise. only starts after 3rd grear and only when 3/4 to full throttle. i'm getting very frustrated and have tried many diff combos of main jets and needles. if anyone has experienced this please give me some ideas of what it might be.

245stroker · 09-25-2009, 07:38 PM

Have you done a comp test? Plug chop? I'd do a comp test to see where its at first. What are you running for a main and wheres the needle at?

blaster240R · 09-25-2009, 07:43 PM

havent done a comperssion test. i just got through the break in process. its all brand new. my carb is 35pwk 150 main, 52 pilot, dek needle on middle pos. its the weirdest thing if im just cruisin it runs fine but the second i get on it, it makes this noise. and severly affects perfomance. the longer i keep it pinned the worse it gets

xmous3yx · 09-26-2009, 12:47 AM

sounds like its beyond pre-ingnition. more like detonation u might wanna try running higher octane fuel. and do as the person above me said. and if worst comes to worst u pull ur head off and check if everything is alright(check on the marbles lol).

xmous3yx · 09-26-2009, 02:25 AM

hey i was thinking try skipping 3rd, throw it in 4th, 5th or 6th. could be a f**cked gear. lol i was just hit by the idea. i dont think this could happen but u said it was third. so u might as well give it a shot.

fmxr47 · 09-26-2009, 03:51 AM

i would say try the highest octane fuel you can easily obtain in your area and try that, the higher the octane the more resistance the fuel has to detonate.

fmxr47 · 09-26-2009, 03:53 AM

where abouts do you live, im from lodi area, if worst comes to worst i could take a look at it for you.

blaster240R · 09-26-2009, 01:12 PM

did a comp. check today and found comp. good at 120. maybe its a combonation of my needle and main jet not being right. its kinda hard to do a plug chop right now when i cant run it very hard at 3/4 to full throttle like you supposed to.

245stroker · 09-27-2009, 12:23 AM

on my carb I'm running the needle on the top clip with the 150 main. Have you tryed adjusting your air screw?

blaster240R · 09-27-2009, 02:50 PM

yeah i've tried that. it idles perfectly. i think i'm gonna try a cgl needl and richin up my main jet and see what happens.

09-25-2009, 07:27 PM	#1 (permalink)
blaster240R flotek power Join Date: Feb 2009 Location: northwest ohio Age: 32 Posts: 565 Rep Power: 24 Reputation:	sounds like marbles in my top end i have a 240 vitos big bore with a 35 pwk carb. at 3/4 to full throttle after 3rd gear i get this noise in my top end that sounds like preignition but slightly diff. when the noise gets really bad engine will stall. it will refire and noise will be gone until i do as described above. i also notice alot of unbunt gas/oil on my a-arms and exhaust flange. when its in neutral i can rev it completely out with no noise. only starts after 3rd grear and only when 3/4 to full throttle. i'm getting very frustrated and have tried many diff combos of main jets and needles. if anyone has experienced this please give me some ideas of what it might be. __________________ currently under destruction....

09-25-2009, 07:38 PM	#2 (permalink)
245stroker Porn Star Join Date: Mar 2008 Location: Tipton, Iowa Age: 33 Posts: 2,309 Rep Power: 55 Reputation:	Re: sounds like marbles in my top end Have you done a comp test? Plug chop? I'd do a comp test to see where its at first. What are you running for a main and wheres the needle at? __________________ Chrome won't get you home but it'll get you laid '04 blaster- ported by Mumms the Word '88 trx250r - building '01 cr125 - stock

09-25-2009, 07:43 PM	#3 (permalink)
blaster240R flotek power Join Date: Feb 2009 Location: northwest ohio Age: 32 Posts: 565 Rep Power: 24 Reputation:	Re: sounds like marbles in my top end havent done a comperssion test. i just got through the break in process. its all brand new. my carb is 35pwk 150 main, 52 pilot, dek needle on middle pos. its the weirdest thing if im just cruisin it runs fine but the second i get on it, it makes this noise. and severly affects perfomance. the longer i keep it pinned the worse it gets __________________ currently under destruction....

09-26-2009, 12:47 AM	#4 (permalink)
xmous3yx Can't Stop, Won't Stop! Join Date: Dec 2008 Location: somerset county, nj Age: 20 Posts: 761 Rep Power: 28 Reputation:	Re: sounds like marbles in my top end sounds like its beyond pre-ingnition. more like detonation u might wanna try running higher octane fuel. and do as the person above me said. and if worst comes to worst u pull ur head off and check if everything is alright(check on the marbles lol). __________________ 2001 blaster AKA BRUISER SOLD! now rockin a kx 125 with a fatty =THE ORIGINATOR OF THE STRIPES= 2stroke is not just a type of motor... its an assault on the senses. Hear the whine, see the smoke, smell the oil burn, feel the powerband, taste the fear in ur mouth. BRAAPP BRAAAAAPP!!!

09-26-2009, 02:25 AM	#5 (permalink)
xmous3yx Can't Stop, Won't Stop! Join Date: Dec 2008 Location: somerset county, nj Age: 20 Posts: 761 Rep Power: 28 Reputation:	Re: sounds like marbles in my top end hey i was thinking try skipping 3rd, throw it in 4th, 5th or 6th. could be a fcked gear. lol i was just hit by the idea. i dont think this could happen but u said it was third. so u might as well give it a shot. __________________ 2001 blaster AKA BRUISER SOLD! now rockin a kx 125 with a fatty =THE ORIGINATOR OF THE STRIPES=** 2stroke is not just a type of motor... its an assault on the senses. Hear the whine, see the smoke, smell the oil burn, feel the powerband, taste the fear in ur mouth. BRAAPP BRAAAAAPP!!!

09-26-2009, 03:51 AM	#6 (permalink)
fmxr47 Can't Stop, Won't Stop! Join Date: Mar 2008 Age: 21 Posts: 743 Rep Power: 38 Reputation:	Re: sounds like marbles in my top end i would say try the highest octane fuel you can easily obtain in your area and try that, the higher the octane the more resistance the fuel has to detonate. __________________ Ninja Blaster: Ninja ex500 motor, yeah it will rip!! SMS +5+1 A-arms +3 extended swing arm +4 durablue banshee axle LTZ400 Rear shock YFZ 450 front shocks LRD Performance 3piece pipe FOR SALE!!! shitty ass balloon tires

09-26-2009, 03:53 AM	#7 (permalink)
fmxr47 Can't Stop, Won't Stop! Join Date: Mar 2008 Age: 21 Posts: 743 Rep Power: 38 Reputation:	Re: sounds like marbles in my top end where abouts do you live, im from lodi area, if worst comes to worst i could take a look at it for you. __________________ Ninja Blaster: Ninja ex500 motor, yeah it will rip!! SMS +5+1 A-arms +3 extended swing arm +4 durablue banshee axle LTZ400 Rear shock YFZ 450 front shocks LRD Performance 3piece pipe FOR SALE!!! shitty ass balloon tires

09-26-2009, 01:12 PM	#8 (permalink)
blaster240R flotek power Join Date: Feb 2009 Location: northwest ohio Age: 32 Posts: 565 Rep Power: 24 Reputation:	Re: sounds like marbles in my top end did a comp. check today and found comp. good at 120. maybe its a combonation of my needle and main jet not being right. its kinda hard to do a plug chop right now when i cant run it very hard at 3/4 to full throttle like you supposed to. __________________ currently under destruction....

09-27-2009, 12:23 AM	#9 (permalink)
245stroker Porn Star Join Date: Mar 2008 Location: Tipton, Iowa Age: 33 Posts: 2,309 Rep Power: 55 Reputation:	Re: sounds like marbles in my top end on my carb I'm running the needle on the top clip with the 150 main. Have you tryed adjusting your air screw? __________________ Chrome won't get you home but it'll get you laid '04 blaster- ported by Mumms the Word '88 trx250r - building '01 cr125 - stock

09-27-2009, 02:50 PM	#10 (permalink)
blaster240R flotek power Join Date: Feb 2009 Location: northwest ohio Age: 32 Posts: 565 Rep Power: 24 Reputation:	Re: sounds like marbles in my top end yeah i've tried that. it idles perfectly. i think i'm gonna try a cgl needl and richin up my main jet and see what happens. __________________ currently under destruction....

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