maybe sparkplug? please help

R

RM85rider123

Member

Oct 28, 2007

681

0

• Jan 29, 2008

• #1

hey, lately when i have been riding my bike, i would get in high rpm ranges and let off the gas, while the engine slows down i cant hear the piston tap off the spark, as in the piston clang on a 2 stroke, is this bad? It almost sounds like it is bogging, but it is not. i have heard that it is the sparkplug, even the piston rings could be burnt and letting air in. thank you all for your response. by the way, the bike is a 2006 RM85L. :cool:

Also when the engine lowers in rpm's and makes the weird sound, i am not on the gas, but once it hits lower rpm's you can hear the piston tapping again, like normal.

 

Last edited: Jan 29, 2008

oldguy

Always Broken

Dec 26, 1999

9,411

0

• Jan 29, 2008

• #2

I am sorry but can not after reading this 3 times figure out what you are asking- try thinking a bit slower and typing it so we do not need a decoder ring to figure it out and I'll bet you'll get an answer

 

R

RM85rider123

Member

Oct 28, 2007

681

0

• Jan 29, 2008

• Thread starter
• #3

sorry oldguy. let me try again, it is hard to explain.
.
when i ride my bike, and i get it in high rpm's it will run fine. until i let off the gas and go in the process of slowing down, you can NOT hear the regular piston tap from a two stroke engine. it almost sounds like a sport bike(crotch rocket) slowing down(they have a smooth sound). could it be from the spark plug? somebody also told me that it could be the piston rings. it is only until i get in the 5000-6000 rpm range that i can hear the piston tap. I hope this helps.

 

Last edited: Jan 29, 2008

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jan 29, 2008

• #4

Hello, what part of the world are you from? Are you trying to say it is loading up?

 

S

sixds

Member

Mar 25, 2007

779

0

• Jan 29, 2008

• #5

piston tap?

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

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Merrillville,Indiana

• Jan 29, 2008

• #6

The sweet sound of ignition, I suppose? Certainly not the sound of the slop.

 

S

sixds

Member

Mar 25, 2007

779

0

• Jan 29, 2008

• #7

sounds to me like hes just hitting the powerband.

 

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BigRedAF

Member

Jan 9, 2005

739

0

• Jan 29, 2008

• #8

Hopefully he has a dad, uncle or adult friend that can sort out his sound effects and help the poor kid... :yikes:

 

Papakeith

COTT Champ Emeritus

Damn Yankees

Aug 31, 2000

6,699

54

RI

• Jan 30, 2008

• #9

Sometimes it's hard to put stuff you are hearing into words.
try to describe piston tap for us?

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jan 30, 2008

• #10

I know, your reeds are shot! The 80 taps, normally. Ignition, it goes pop, pop, and when you let off full throttle it is not popping? It is loading up with fuel and not igniting? Big bikes do not tap or pop, they go brap! Semantics, they get argued a lot!

 

R

RM85rider123

Member

Oct 28, 2007

681

0

• Jan 30, 2008

• Thread starter
• #11

thank you papa-keith for saying that. but the problem is not the piston tapping (papakeith, say you just started a 2 stroke, you know the sound? I am talking about the clang clang clang of the piston when the bike is sitting there.) thank you whenfoxforksruled, it sounds like it might be the reeds. but couldnt it be the sparkplug? if it is the reeds, would it hurt if i still rode the bike with them damaged? i am so very sorry though everybody, it is hard to explain the situation.

whenfoxforksruled, the fuel is igniting, but i can not here the "piston tap" from the engine when i am lowering in rpm's. nothing is wrong with the fuel igniting. even when this is happening, it still has a butload of power. :laugh:

i hope i get this sorted out fast, i am going riding with my friend this saturday, while i am getting a sparkplug (if i need it) and crankcase oil this friday, so please help.

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jan 30, 2008

• #12

Pull the carb off and look into the reed cage with a flashlight. It would be easier to just pull the reed out, but you will need 2 new gaskets. What does the plug look like?
You are going a long wfo and completely let off the throttle. Now if you turn the throttle back to wfo does it hesitate, or does the power pick back up?

 

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BigRedAF

Member

Jan 9, 2005

739

0

• Jan 30, 2008

• #13

Last time I had broken reeds it felt like the bike was hitting a rev limiter at a much lower RPM. It literally would not rev...

 

Jasle

Sponsoring Member

Nov 27, 2001

1,358

0

• Jan 31, 2008

• #14

I'm thinking loose piston clearance. time for a new topend.

do a compression test. just swap the plug out to see if its it. in still there then do compression test.