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Author Topic: Decompressor woes  (Read 1109 times)

Mr.Mazza

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Re: Decompressor woes
« Reply #30 on: April 24, 2014, 08:48:31 AM »
Bikes at a good workshop, they'll give a squizz saturday (Public holiday Friday) and I should have her by monday after work.
If they need a head gasket at least ill know who they can call, cheers Charles, I should be along Tuesday night.
Lizzy - 07 500 Deluxe ES - Red and chrome

Mr.Mazza

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Re: Decompressor woes
« Reply #31 on: April 28, 2014, 03:09:33 AM »
Update:
The thread is too fucked to repair so current plan to head off, maybe weld the old thread and retap making sure the hole to the exhaust is still there.
As you can imagine im mega pissed off.
Lizzy - 07 500 Deluxe ES - Red and chrome

Arizoni

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Re: Decompressor woes
« Reply #32 on: April 28, 2014, 05:37:52 AM »
Your mechanic couldn't install a new metric Heli-coil insert?

Like I mentioned before, these inserts are large enough that if a threaded hole was totally stripped out with no old threads at all there would still have enough material left in the hole to produce the Heli-coils oversize threads.

The only thing that might be wrong in using a Heli-coil is one would produce threads from the top of the hole to the bottom and any intersecting side hole would be rather blocked off by the body of the insert.
Even this wouldn't be gas tight though.  The insert is made by winding a coil of diamond shaped wire into a cylinder and the walls of the cylinder aren't gas tight so some leakage thru the body of the insert to the exhaust would exist.
If I were doing it with the head off,  after the Heli-coil was installed I would take a grinding stone on my Dremel and grind away the threads that would be blocking the passage to the exhaust port.

Personally, I am not fond of welding up a aluminum casting when the parent material isn't known. 
Then there is the possibility of the casting being warped due to the welding heat.

You might need to talk to your mechanic a bit more.  I would be interested in why a metric Heli-coil wouldn't work.
« Last Edit: April 28, 2014, 05:40:14 AM by Arizoni »
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

Mr.Mazza

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Re: Decompressor woes
« Reply #33 on: April 28, 2014, 08:45:46 AM »
He's said a Heli coil isnt strong enough and he doesnt trust making a whole thread outta the stuff.
The heads off, he will call in the morning and discuss, I want the bike asap as with the payment for this i cant afford petrol for the car, which is falling apart.
Lizzy - 07 500 Deluxe ES - Red and chrome

Mr.Mazza

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Re: Decompressor woes
« Reply #34 on: May 01, 2014, 12:20:01 AM »
Alright I finally conviced him to heli-coil it!
He said I wanna get engineers involved to see what we can do rah rah
I just said, look Ive had console from guys who race these engines overseas and a helicoil is fine!
So Ill have her back today or tomorrow! :)
Lizzy - 07 500 Deluxe ES - Red and chrome

Blltrdr

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Re: Decompressor woes
« Reply #35 on: May 01, 2014, 03:18:50 AM »
I just installed a Helicoil on my Kawasaki alternator. Took me 5 minutes. Very easy process. Works perfect.
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Arizoni

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Re: Decompressor woes
« Reply #36 on: May 01, 2014, 10:32:58 PM »
MrMazza
Just to add a little support to your decision, when a is Heli-coil installed properly (correct tap used to cut the threads and a dab of thread locking compound on the outside of the Heli-coil to keep it from unscrewing) it will be stronger than the original threaded hole.

Not only will it have real steel threads for the mating part to interface with but the larger external threads on the insert engage a larger area of the aluminum part.
To understand this just think of replacing a 1/2-20UNF bolt with a 9/16-18UNF bolt.  The larger 9/16 inch bolt will be able to produce or withstand a larger force before it fails.

Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

Mr.Mazza

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Re: Decompressor woes
« Reply #37 on: May 02, 2014, 05:40:29 AM »
Hey guys, another update!
Thread is all fixed up, just waiting on the new head gasket and decomp valve (The old one was a wee bent so like $5 for a new one) but the old assembly is okay, just the stupid postal service might take until Monday to deliver them.

It's all going well, and my foot/ankle is healing amazingly fast, so I should be riding again by mid next week!
Lizzy - 07 500 Deluxe ES - Red and chrome

Mr.Mazza

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Re: Decompressor woes
« Reply #38 on: May 05, 2014, 08:01:05 AM »
Yaaaaaaayayayayayayayayayaaaa!
Have Lizzy back and 100% :D
Lizzy - 07 500 Deluxe ES - Red and chrome

REpozer

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Re: Decompressor woes
« Reply #39 on: May 05, 2014, 08:11:37 AM »
Nice one !
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ace.cafe

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Re: Decompressor woes
« Reply #40 on: May 05, 2014, 11:41:34 AM »
Good news!
Home of the ACE Fireball 535 Bullet,  Ace GP Hi-Lift Roller Rocker Head . Pistons, cams, etc. Highest performance Bullet engine mods available .  AVL mods. Redditch 700/750 Twin mods. UCE kit soon.

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azcatfan

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Re: Decompressor woes
« Reply #41 on: May 05, 2014, 01:48:19 PM »
Time to go for a ride!
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Arizoni

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Re: Decompressor woes
« Reply #42 on: May 05, 2014, 10:14:42 PM »
That's great news Mr.Mazza ! :)

LONG LIVE THE THUMP!   ;D
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

Mr.Mazza

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Re: Decompressor woes
« Reply #43 on: May 05, 2014, 10:15:12 PM »
She's thumping perfectly.
Lizzy - 07 500 Deluxe ES - Red and chrome