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Author Topic: Decompression device by Larry Wiechman  (Read 1801 times)
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Hawkeye58
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« on: October 03, 2017, 09:13:13 AM »

I received my Head back from Larry Wiechman Friday. When I first layed eyes on it I was amazed at his fine work.
Larry is a great customer oriented individual, It was pleasure to do business with him.
This head with his machine work and the welding is a thing of beauty!! I'm almost done with assembly and intend to do my warm up cycles probably today after work.
 





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Hawkeye58
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« Reply #1 on: October 10, 2017, 09:04:14 AM »

Hi again,
Now that I have had the engine together and did my break in I am getting aquainted with how the decompression device works and performs.
So far, it does exactly as advertised. The stroke feels like a 125 or 250.
Once the first ignition occurs the valve closes and the engine performs flawlessly.
The vent does put a bit of residue on the elbow, but, that cleans right off at the end of the ride, during bike washing.
I would recommend this upgrade to anyone!!

Hawkeye  cool
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Green Flash
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« Reply #2 on: May 23, 2018, 01:03:11 PM »

I agree, best mod ever. makes starting fun again!
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Enduro Addict
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« Reply #3 on: June 29, 2018, 05:55:25 PM »

I have got to get me one of those.  My 50 year old leg does not like to kick the old girl anymore!
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KXDINO
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« Reply #4 on: June 30, 2018, 02:48:32 PM »

thats the best one of seen , very neat.
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umberto
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Goliath Returning from Battle


« Reply #5 on: June 30, 2018, 02:50:36 PM »

As soon as I get my 250 together, I am sending Goliath's head over to Larry.  I've only been talking about it for nearly three years now.   grin
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Perhaps I have a dirt bike addiction?

03 KX 250/88 KX 525 - Goliath
2017 KX250F/2004 KX250
04 KX 250 - Lunchbox's Bike
05 KX 125/144
Larry Wiechman
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« Reply #6 on: June 30, 2018, 08:47:09 PM »


 I'll be on vacation the first two weeks of July.

 My turn to ride!
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mazderati
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« Reply #7 on: July 03, 2018, 08:08:31 AM »

I'm installing Larry's modified head and have two questions.

1. Is there a sequence for torquing the cylinder head bolts?  The service manual specifies 18 ft lbs on the bolts but no sequence.

2. Do you use any type of sealant or antiseize on the cylinder head studs?

Thanks in advance.
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sandblaster
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WWW
« Reply #8 on: July 03, 2018, 08:20:49 AM »

I like to use thread locker on the stud where the threads go into the head.
Then coat the exposed stud with anti-seize.
I use a basic star pattern.
I hand tighten all the nuts.
Then go 6lb torque star pattern, then, 13lb, then 19lb.
After I hit 19 on all the nuts, I go back and hit them again just to be safe.
After about a hour of riding I go back and hit the nuts again.
From there you should be good to go.
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.
mazderati
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« Reply #9 on: July 03, 2018, 08:35:16 AM »

^ Seems reasonable.  Many thanks.
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Larry Wiechman
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« Reply #10 on: July 03, 2018, 08:40:07 AM »

I like to use thread locker on the stud where the threads go into the head.
Then coat the exposed stud with anti-seize.
I use a basic star pattern.
I hand tighten all the nuts.
Then go 6lb torque star pattern, then, 13lb, then 19lb.
After I hit 19 on all the nuts, I go back and hit them again just to be safe.
After about a hour of riding I go back and hit the nuts again.
From there you should be good to go.

Echo what Mike wrote above, but torqued to 18 ft-lb.
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