04-14-2014, 08:23 PM | #1 |
Not Yet Wild
Join Date: Apr 2014
Posts: 35
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79 help with compression
Hello everyone. First time poster but have read a TON of info on here. I have been trying to piece diff threads together to solve my issue but after getting a bit confused i wanted to start own thread. Im no big mechanic but do tinker some. After cleaning carb, new points, condensor, plug, wire, both belts, air and fuel filter im getting fire but no fuel. I have timing where it needs to be according to manual. Compression is my problem testing at 45 in forward and 60 in reverse. After pulling exhaust i can see all three rings are still there. There are a few small chunks missing from the piston between the bottom and middle ring. The cylinder and rest of the piston look fairly good however ive never done this before so not 100 percent sure what they should look like after years of use. There does seem to be a fair amount of play when i push on piston through exhaust hole. My biggest deal is i think i can replace a jug, piston, and rings but i dont want to have to mess with tearing engine apart and do seals, bearing etc. as i dont have enough time nor all the special tools. The cart is all painted and new seats etc so i dont want to give up completely yet. However i dont want to put another 150 into it and still not run worth a darn or i will just cut my loss now and sell it. Please help!!! By the way i dont see any signs of any oil/gas leaking from either seal at this point. Any help is appreciated! Thanks
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04-15-2014, 08:50 AM | #2 |
Gone Wild
Join Date: Apr 2009
Location: Milton Wi.
Posts: 708
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Re: 79 help with compression
If your seeing pieces of the piston missing it's time for a top end rebuild. if the crank seals are bad you'll most likely see an oily, dirty build up around the seal.
with exhaust removed turn motor over till piston is at bottom and look inside the jug with a flashlight. any vertical scratches will tell you a piston or ring has gone south. you can also pull the head and see if it's full of small pits from the pieces hitting it. |
04-15-2014, 09:40 AM | #3 | |
Not Yet Wild
Join Date: Apr 2014
Posts: 35
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Re: 79 help with compression
Quote:
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04-15-2014, 09:49 AM | #4 |
Respect the Cart
Join Date: May 2010
Location: Rocky Mount, Virginia
Posts: 2,190
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Re: 79 help with compression
I'm not an H-D guy but I do know 2 strokes. I would have to say that if you rebuild the top end and do not at the least replace the main bearings and seals you will be heading down the road that leads to heartbreak, misery and tears. Seriously I believe you should do all or nothing.
Just my $0.02 Dave |
04-15-2014, 10:23 AM | #5 | |
Not Yet Wild
Join Date: Apr 2014
Posts: 35
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Re: 79 help with compression
Quote:
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04-15-2014, 02:59 PM | #6 |
Respect the Cart
Join Date: May 2010
Location: Rocky Mount, Virginia
Posts: 2,190
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Re: 79 help with compression
Well, again, this is what I would do but not necessarily what you might want to do. If your back is up for it grab the drive clutch and try to lift the engine. If you see or feel any movement between the crankshaft and the crankcase your bearings are worn and will need to be replaced, at this stage you might want to sell the cart.
If the bearings feel good then remove the head and the cylinder, grab the connecting rod and see if you can feel any play in the big end. If you do then you will need a new crankshaft and I guess that is game over. If you think that the bottom end is sound, well it's now your call buddy. As I say this is just my opinion, your experience may vary. Dave |
04-15-2014, 03:04 PM | #7 |
Gone Wild
Join Date: Nov 2013
Location: Aylett, Va. on the Mattaponi.
Posts: 1,530
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Re: 79 help with compression
Clone it...
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04-15-2014, 03:35 PM | #8 | |
Not Yet Wild
Join Date: Apr 2014
Posts: 35
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Re: 79 help with compression
Quote:
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04-15-2014, 06:42 PM | #9 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,941
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Re: 79 help with compression
I have no stats to back this up but I would be willing to bet that just doing the top end on these carts takes care of 80% of compression issues. I definitely see Dave's point but, at the same time, I don't like the thought of fixing things that don't necessarily need fixing. I would try the top end only and see where that gets you. Doing so on my '80 got me from 45 to 95 psi and on my '85 it got me from 50 to 95.
You'll be able to do the top end in an hour or two and a kit costs all of about $150. It's not like you'll have a ton of time and money invested in it if you end up having to do more. The bottoms of these engines are pretty stable, crank seals notwithstanding. |
04-15-2014, 08:03 PM | #10 |
Not Yet Wild
Join Date: Apr 2014
Posts: 35
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Re: 79 help with compression
First dumb question. What special socket does a guy need to take off the head bolts. None of my sockets fit. As in the 3/4 sockets i have are too big around. Thanks
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