Hi guys, it's been ages since I've been on here..... I've finally got almost enough money to get both sleds running for this winter... Last year my 78 wasn't running worth cr@p right up until it's stator burned up. I resealed the engine about 2.5 years ago, and when I did I put all new gaskets throughout and replaced all the bolts in the head with new bolts from the local hardware store (allen head bolts.... Looks sweet!)
Anyhow, after resealing (original rings yet...) I had 105 & 110 PSI of compression when engine was warmed up.... Fast forward to last winter, I was having symptoms that pointed to both rich and lean mixtures.... It just couldn't seem to get over 5k...... Compression was like 100 & 70 psi!!
Fast forward to yesterday: Took the engine out of the trailer and threw it on the bench. Squirted motor oil down the spark plug holes and rolled it over with the electric drill.... Compression with oil in the cylinders was 120 pto and 95 mag..... My thought is this: I have since used bolts from the same hardware store on the chain tensioner in my Mercedes and found out that those bolts stretch... They're a soft metal composition. Could this be the cause of my compression issues? I've got all the original bolts from the engine and I'm think of pulling the replacements out one at a time and putting the JD stock bolts back in and torquing them down..... Or do I have to replace the Headgasket too.......
Sorry about the long-winded post... Look forward to hearing from you guys!
Headgasket??? 78 Liquifire.........
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deerefanatic
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harleysportster
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Headgasket??? 78 Liquifire.........
deerefanatic ,
A simple test would be to retorque the head and then take another compression reading. If the compression rises, at least there is nothing else wrong. If it doesn't, then the rings are not sealing properly. Did you hone the cylinder when you had it apart. I would put the original studs back in.
A simple test would be to retorque the head and then take another compression reading. If the compression rises, at least there is nothing else wrong. If it doesn't, then the rings are not sealing properly. Did you hone the cylinder when you had it apart. I would put the original studs back in.
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
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deerefanatic
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Headgasket??? 78 Liquifire.........
No honing........ Put the same rings back in... If I have to replace the Headgasket, I'll put new rings in it and hone it........
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deerefanatic
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Headgasket??? 78 Liquifire.........
Yah, tell me about it... IIRC, when I took the rings off the pistons and measured ring end gap, it was still in spec..... Either way, I'm gonna need to tear it down one way or another...... I do have a healthy 340 Liquid motor that I can fall back on if necessary.... Just gotta rejet my carbs and go.......
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deerefanatic
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Headgasket??? 78 Liquifire.........
OK, I retorqued the head and my compression numbers didn't get any better... So I removed all the bolts and took the head and cylinders off and found:......................
The Mag side piston was scuffed badly and had both rings stuck...
It left some aluminum deposits on the top portion of the cylinder... Pto side was fine. I took the rings off of the PTO piston, end gap was .025 & .023 for ring 1 & 2.... I managed to get the rings off of the mag piston and it was .023 & .021 for rings 1 & 2.......
I put the jugs in the drill press and ran the stone-hone on em and it took the the aluminum deposit off of the cylinder wall and left a nice cross-hatch.. Not factory cross-hatch by any means....... but the only purpose of cross hatch is to get the rings to seat when the engine is first being broken in....... I'm going to take it to a local motorcycle/atv mechanic I know and have him measure the inside of the bore for me so I know if it's worn out of spec or just needs rings.....
I've got pics, but they're still on the camera right now......
The Mag side piston was scuffed badly and had both rings stuck...
It left some aluminum deposits on the top portion of the cylinder... Pto side was fine. I took the rings off of the PTO piston, end gap was .025 & .023 for ring 1 & 2.... I managed to get the rings off of the mag piston and it was .023 & .021 for rings 1 & 2....... I put the jugs in the drill press and ran the stone-hone on em and it took the the aluminum deposit off of the cylinder wall and left a nice cross-hatch.. Not factory cross-hatch by any means....... but the only purpose of cross hatch is to get the rings to seat when the engine is first being broken in....... I'm going to take it to a local motorcycle/atv mechanic I know and have him measure the inside of the bore for me so I know if it's worn out of spec or just needs rings.....
I've got pics, but they're still on the camera right now......
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ICCSF 108
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Headgasket??? 78 Liquifire.........
If it were mine I would just hone both sleeves to get a cross hatch, make sure the pistons are clean by using some emery cloth on the pistons to shine them up a little ( so there is no alum. deposits where they don't belong & to knock down any high, ruff, or sharp spots) Wash all the parts up, and make sure nothing went done inside the crank case. Put in new rings & gaskets & run it. (remember ware is clearance & 2 strokes need clearance.
Just my $.0685 worth
Kenny
Just my $.0685 worth
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
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deerefanatic
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Headgasket??? 78 Liquifire.........
Here's the pics...... In these pics, mag is right piston, PTO is left piston......
Pic 1.....
Pic 1.....
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deerefanatic
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Headgasket??? 78 Liquifire.........
Pic 2.............
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deerefanatic
- Posts: 147
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Headgasket??? 78 Liquifire.........
Pic 3............
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ICCSF 108
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- Real Name: Kenny Heins, AKA Grumpy
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Headgasket??? 78 Liquifire.........
In picture # 2 the right hand piston "mag is right piston" looks to have pits around the top & top side if this is the case then I would replace it & maybe both (just because your replacing one & if you can find some cheap NOS JD ones), if it ISN'T then I would clean up the whole piston with emery cloth & install new rings ( do this to both pistons)
Kenny
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
-
deerefanatic
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- Joined: Thu Aug 11, 2005 12:00 am
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Headgasket??? 78 Liquifire.........
yah, it's not only pitted but it has a sunken spot on top too.......
It's definitely toasted!
It's definitely toasted!
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ICCSF 108
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- Joined: Sun Jul 17, 2005 12:00 am
- Real Name: Kenny Heins, AKA Grumpy
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Headgasket??? 78 Liquifire.........
I just saw this, are you running a Hew-Tech CDI on this motor? If so, maybe with the hotter spark you should be running BUE or N19V Plugs in the motor.
Just a thought
Kenny
Just a thought
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
-
deerefanatic
- Posts: 147
- Joined: Thu Aug 11, 2005 12:00 am
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Headgasket??? 78 Liquifire.........
Yes I am... I tried some BUE's last year...... I didn't like em at all.... Seemed like if you didn't run hammer-down all the time you could feel em load up and then the engine was real sluggish till you opened it up for a long while........ I run either B10es or B9ES or the Resistor variants of both, which I will no longer use due to hearing probs with NGK resistor plugs with our CDI systems....
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ICCSF 108
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- Joined: Sun Jul 17, 2005 12:00 am
- Real Name: Kenny Heins, AKA Grumpy
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Headgasket??? 78 Liquifire.........
Oh OK I thought maybe they were a lot hotter than the std. CDI, guess not, I know It takes a good hot CDI to fire the BUE's or Like you said Hammer down all the time.
Kenny
Kenny
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
-
harleysportster
- Posts: 2965
- Joined: Thu Jul 14, 2005 12:00 am
- Real Name: Pat Scott
- Location: Southeast Pa.
Headgasket??? 78 Liquifire.........
Delete
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)