Take A Look At This

2797 Views 20 Replies 12 Participants Last post by Billy17425, Mar 22, 2009

xxasilaydyingxx

Discussion Starter · Mar 18, 2009

A few days ago i posted about my intake cam journal getting marked up for a reason i couldnt figure out. Well today I pulled the head and cylinder off only to become filled with more anger :angryfire: I found that the rings had moved and these lines up and down ranging in with which I have never seen before after about 25 hours on a brand new motor.
It looks to me that the coating process did not work because it looks like some of the nikisile has flaked off. So I think some flakes or whatever could have ran threw my motor and restricted oil to the intake cam and scored it up. Tell me what you think because this is the best answer i can come up with as to why this all happend

http://i161.photobucket.com/albums/t238/xx.../0317092010.jpg

See less See more

1 - 20 of 21 Posts

supraomega

· #2 · Mar 18, 2009

Did you assemble this motor yourself? I would make sure the rings were gapped and installed correctly. Is this a Yam cylinder? Can you actually feel these grooves with a fingernail? Check your oil passages on the cam cap, but I seriously doubt a tiny amount of the nic was the cause for both your issues.

YFZER359

· #3 · Mar 18, 2009

wow dude, you havent been havin the greatest luck

sporner10732

· #4 · Mar 18, 2009

Ive had a cylinder do this before in a 2 stroke. It looks like somthing is out of round and the rings were trying to seal .What do the rings look like. Did you have oil blow bye. Whats the plug look like. Need to get the mics out and check the roundness. I have seen the cylinders flake the coating before but that was years ago.

YFZER359

· #5 · Mar 18, 2009

QUOTE (sporner @ Mar 17 2009, 06:36 PM) index.php?act=findpost&pid=758981

Ive had a cylinder do this before in a 2 stroke it looks like somthing is out of round and the rings were trying to seal what do the rings look like did you have oil blow bye whats the plug look like need to get the mics out and check the roundness[/b]

dude, periods and commas really help. Cant understand one thing your sayin

Joester

· #6 · Mar 18, 2009

i am a teacher at the most reputable english school in the world and... lol. i dont want to start this again

YFZER359

· #7 · Mar 18, 2009

QUOTE (Joester @ Mar 17 2009, 06:41 PM) index.php?act=findpost&pid=758991

i am a teacher at the most reputable english school in the world and... lol. i dont want to start this again[/b]

lol either do i. I knew you were gunna be here, you can smell those kinds of posts lol

leveldrummer

· #8 · Mar 18, 2009

has anyone been in this engine at all? is this 25 hours on a rebuilt motor? or a BRAND NEW motor?

who did the rebuild?

was it a new cylinder, was it re-coated, or honed and reassembled? something certainly isnt right.

2fast4uracingxc

· #9 · Mar 18, 2009

who put it together

xxasilaydyingxx

Discussion Starter · #10 · Mar 18, 2009

I rebuilt the motor a few months ago installed a wr conversion with a stock wr450 piston from yamaha. Previous to this, my motor hadn’t blown I just did this to fresh in it up so the cylinder was in good shape. Regardless I sent it out with the piston to be honed and recoated and when reinstalling the new piston/rings the gaps were set to spec and a ring compressor was used for assembly I also broke it in as I did every motor I have redone. Most scrapes in the wall are as smooth as glass but there are few you can feel with your fingernail

Terse

· #11 · Mar 18, 2009

Looks like the rings wore off the high spots in the cylinder...... I'm just guessing though cuz I've never seen this before.

New jug or old one? If old one was it "honed"? If it were honed then the maybe the hone wore through some of the thinner coating, and then the rings wore through them even more.

Just guessing though.

Also, I too do not believe what you are seeing has anything to do with the cam journal, or the coating blocking any oil passages.... the only oil passage that I have seen get blocked is a drilled oil mod... but that is rare too.

cubanaso

· #12 · Mar 18, 2009

i was worned not 2 hone or recoat unless it was by someone that specializes in Naskal

Terse

· #13 · Mar 19, 2009

QUOTE (cubanaso @ Mar 18 2009, 04:06 PM) index.php?act=findpost&pid=759323

i was worned not 2 hone or recoat unless it was by someone that specializes in Naskal[/b]

That is correct.

prospecdc

· #14 · Mar 19, 2009

QUOTE (cubanaso @ Mar 18 2009, 02:06 PM) index.php?act=findpost&pid=759323

i was worned not 2 hone or recoat unless it was by someone that specializes in Naskal[/b]

Yeah i heard that same thing

prospecdc

· #15 · Mar 19, 2009

QUOTE (Terse @ Mar 17 2009, 07:51 PM) index.php?act=findpost&pid=759048

Looks like the rings wore off the high spots in the cylinder...... I'm just guessing though cuz I've never seen this before.[/b]

That was my first impression.

musthavebeenblue

· #16 · Mar 19, 2009

isnt the correct term nikasil?

prospecdc

· #17 · Mar 19, 2009

yeah that how it spelled.

xxasilaydyingxx

Discussion Starter · #18 · Mar 20, 2009

So do you think something went wrong with the initial coating process?

prospecdc

· #19 · Mar 20, 2009

did they re coat it on this last rebuild?

xxasilaydyingxx

Discussion Starter · #20 · Mar 21, 2009

yes i sent it out to be recoated and 20 hours later it looks like that

1 - 20 of 21 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.