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PostPosted: Thu Apr 25, 2013 3:44 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
well the 360 has finally showed back up in my hands. time to get it rebuilt and installed. just in time for some spring riding..well maybe if the weather warms up lol


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PostPosted: Thu Apr 25, 2013 3:50 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
got the ring gaps set at .012 everything went together pretty well..did a leak down and had a small leak but i couldn't find it. it was really small put 6 lbs in and over 15min it lost close to a pound. but i couldn't find any bubbling any wear. so on to the compression test i went, and i really cant believe it. i think i am in trouble. i will let the pic tell the story


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PostPosted: Thu Apr 25, 2013 3:53 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
this was dead cold just assembly lube on the cylinder walls. whats is the compession going to be when the rings finally seat in place..i was running av gas last year for the 100 octane out of it but. i have a feeling that aint going to be enough now. what are you guys thoughts


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PostPosted: Thu Apr 25, 2013 5:51 pm 
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Joined: Fri Feb 29, 2008 1:51 am
Posts: 2703
Location: Upland, Ca
too high. you can run 2 honda atc 250r base gaskets but I don't think it will lower the comp by 20 lbs. You want to be under 180 for your type of riding. I would put a plate under the cylinder to raise to to lower the compression. You wont hurt the port timing


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PostPosted: Thu Apr 25, 2013 5:52 pm 
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Joined: Fri Feb 29, 2008 1:51 am
Posts: 2703
Location: Upland, Ca
pull the plug and check your squish. You can also have the head cut if you don't want to plate the cylinder. Hoser or speed could help with that part.


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PostPosted: Thu Apr 25, 2013 7:35 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
my squish is .0445. used solder to figure it that out. this was with a speed chaser gasket. they are slightly thinker than the oem honda one that i have that measures .016..not sure what to do at this point. things were going way to smooth, and my luck hit me hard again. installed the Engine add oil to the balancer, primed the fuel and then touched the starter button, and it fired right up without any hesitation. sounded like music. shut it down after a few seconds of idling because i didnt have any coolant in it at this time. so i started to fill it up and it starts leaking out around where the head and the cylinder meet. i use rubber orings here and have never had a problem before. looks like my head is f*cked. i had ken clean it up and lap it. and now it leaking.


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PostPosted: Thu Apr 25, 2013 7:40 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
is it possible to have it trenched out and tig welded again, and then lapped back down to where it is now, almost afraid to go any deeper with the bowl., but that would probly be the best way to lower my compression??


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PostPosted: Fri Apr 26, 2013 12:12 am 
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Joined: Tue Feb 12, 2013 1:01 pm
Posts: 341
Location: North San Diego
How about checking the thickness of the piston head and milling it down?

If its a wiseco, they have pretty thick skulls

Also, for the leak, you could try setting up permatex around the outside of the outer o ring, no higher than the o ring and when you cinch it down it should press the excess out, let it sit up...

Or, custom copper head gaskets?

Not the greatest fixes by any stretch

As far as tig fix, anything is possible by a good welder

How much did the builder have to lap it down?

In any case, I am in love with that Engine

Good luck


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PostPosted: Fri Apr 26, 2013 7:50 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
so i went to a place in town here and he said it can be repaired, they will put it on the lathe and dig out a little trench then tig weld it all back together then lap it back down. he said my squish band is good where it is a .045. and to lower compression he will add a few more cc to the combustion camber, i am shooting for around 180 psi, that way i can run it on the fuel that we have available up here..i am not sure how to cc a head so i think i will just leave that to the guy doing my work for me. going to drop it off monday then he can have the two weeks that i am gone to work to fix it


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PostPosted: Wed May 22, 2013 5:21 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
ok need help here..the guy fixing my head said its 27 cc right now. and the compression was almost 210. i want to lower it to somewhere around 170, i should be able to run on premium fuel if need. but i still have a barrel of av gas sitting here to burn up.. how much does he need to increase the cc by to lower the compression.


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PostPosted: Thu May 23, 2013 1:02 am 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
anyone? what would be a good compression to shoot for..is 170ish still to high for premium fuel and/or av gas.
what is the cc on a stock head, or anyone with some of these race engines, have you cc'd them. i don't need and exact number just something that will put me in that range


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PostPosted: Mon May 27, 2013 4:32 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
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Location: saskatoon, sk, canada
so the shop said that they cc it to 31.5 so i went and picked the head up and did a compression and its over 210..wtf i really need some help here.


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PostPosted: Mon May 27, 2013 5:18 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
Did a few compression tests. Most were right at 210 but one just kept climbing. Throttle it taped wide open as well.


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PostPosted: Mon May 27, 2013 10:10 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
So took it back and they went to 34cc. Now it's down to 200. So I thought I would throw a stock head on and see what compression was. I was shocked. And this was a completely stock air cooled head.


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PostPosted: Mon May 27, 2013 10:42 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
You might want to try another compression tester or test yours. I have two and one of them was out 15psi (the cheap Asian one). I checked the testers with my air compressor.
With regards to your compression I own two 350 air cooled oddys. The only one that runs is mine at 120psi. My brothers piece of crap keeps blowing holes in piston. We don't even make it more than two miles and booom. The compression when I got it was 170psi. We ran premium fuel (97) and run 20/1 mix. Yup poofkaboom. So I put two cyl base gaskets on for a total of .030 and got a compression of 150psi but motor (( Internal Combustion Engine ? )) punched a hole again. He has the same modified cyl as you but its air cooled. I have the parts now to redo but still to pissed to rebuild. I am going to add another .030 to base to lower another 20psi and see what it will do. Going to vegas tomorrow to world series then back to Canada and a new job up north so don't know when I will get time to post results, also adoha and hoser wanted me to check some stuff and post but just haven't had the heart yet. So in short .030 will drop ya about 20psi approx.


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PostPosted: Mon May 27, 2013 11:31 pm 
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Joined: Fri Feb 29, 2008 1:51 am
Posts: 2703
Location: Upland, Ca
Your pistons deck heigth is high that's why your getting high compression readings with a stock head. A stock cylinder will sit 1/8 higher the the lip of the piston. Which base gasket are you running again? If it was mine I would run 2 of these gaskets. Stock 250r perfect fit just need to trim the center out an 1/8th inch.


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PostPosted: Mon May 27, 2013 11:37 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
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Location: saskatoon, sk, canada
http://www.canadiantire.ca/AST/browse/4 ... ?locale=en" ."..

this is the tester that i am using.

i am not sure as to why the compression a stock head was so high. will try to get a different tester and see what happens. i leave for work tomorrow which really sucks. so i am hoping i can get something worked out tomorrow before i have to leave.


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PostPosted: Mon May 27, 2013 11:43 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
shoubadaba wrote:
Your pistons deck heigth is high that's why your getting high compression readings with a stock head. A stock cylinder will sit 1/8 higher the the lip of the piston. Which base gasket are you running again? If it was mine I would run 2 of these gaskets. Stock 250r perfect fit just need to trim the center out an 1/8th inch.



i am running a speedchaser gasket. i think i might have another stock gasket kickin around.


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PostPosted: Tue May 28, 2013 1:31 am 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
fully wrote:
shoubadaba wrote:
Your pistons deck heigth is high that's why your getting high compression readings with a stock head. A stock cylinder will sit 1/8 higher the the lip of the piston. Which base gasket are you running again? If it was mine I would run 2 of these gaskets. Stock 250r perfect fit just need to trim the center out an 1/8th inch.



i am running a speedchaser gasket. i think i might have another stock gasket kickin around.


I my opinion I don't think two of these gaskets will be enough. You have some very high compression there so you are gona have to get it down or run race gas. Even at 150 psi with two gaskets on mine the piston holed with premium gas. The key here is what shoubadaba said: "A stock cylinder will sit 1/8 higher than lip of piston". I think he is pretty close on that cause with my two gaskets the piston is "almost" still flush with top of cylinder. Yes chamber size makes a difference and I don't know what I got but I still think shoubadaba is close.


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PostPosted: Tue May 28, 2013 8:32 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
fully wrote:
http://www.canadiantire.ca/AST/browse/4/Auto/AutoTools/MultiTesters/PRD~0251019P/Equus+Pro+Compression+Tester+Kit.jsp?locale=en" .".." ."..

this is the tester that i am using.

i am not sure as to why the compression a stock head was so high. will try to get a different tester and see what happens. i leave for work tomorrow which really sucks. so i am hoping i can get something worked out tomorrow before i have to leave.


Because your cylinder has been modified they machined material off the top of the cylinder see how close the piston comes to the top of the cylinder, you can measure the height of the cylinder and compare it to a stock cylinder to see about how much was removed.


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PostPosted: Tue May 28, 2013 2:22 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
Today he bowled it out to 37.5cc. And compression was at 165-170 right where I need to be. And with dual base gaskets it was 155. So I think I can finally put it back together. The squish band is quite small now. Is that going to affect anything.


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PostPosted: Wed May 29, 2013 11:13 am 
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Joined: Wed Jan 14, 2004 8:45 pm
Posts: 2243
EXCELLENT! Keep us posted with updates, inquiring minds and all. lol


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PostPosted: Sun Oct 14, 2018 11:18 am 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
just thought I would post an update on this Engine. other than my jetting still being of it has ran like a champ. the last time this Engine was opened up was in 2013, I have ran well over 300 litres of avgas through it. I was out in the garage yesterday polishing and cleaning it up and decide I should take a compression test, well its no longer at 170. but at a respectable 150. that's a lot of run time and only 20psi lost. I am very temped to pull the cylinder off and send to a certain someone, and see what kind of power can be pulled out of this Engine.
my buddy just bought a Polaris RS1, and I don't like being blown away. a 583 or 670 swap would be cool but then what would I do with this set up. this little one lunger has really grown on me, and I love it.


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PostPosted: Sun Oct 14, 2018 2:11 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
fully wrote:
my buddy just bought a Polaris RS1, and I don't like being blown away. a 583 or 670 swap would be cool but then what would I do with this set up. this little one lunger has really grown on me, and I love it.


I just checked the taro cards and read the tea leaves. I see blown gearboxes and twisted axels in your future. In the one pic, you show you and your machine in mid flight. One of those flights with a hard landing and it's all over with a 583 or 670. Just my opinion.
That's a sweet Engine. Why the hatred ??


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PostPosted: Sun Oct 14, 2018 9:31 pm 
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Joined: Mon Jul 19, 2010 3:20 pm
Posts: 1718
Location: saskatoon, sk, canada
canadian oddy wrote:
Why the hatred ??

Not sure what you’re talking about here.

And if you have seen any of my videos I air this oddy out on a regular basis. I’m already running more HP than a stock oddy and haven’t blown or twisted anything yet. I’m no rookie at airing this girl out


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