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Post by captaincodfish on Apr 19, 2017 18:50:45 GMT -5
Hey everybody. I bought the 91 Honda Elite 80 for $200 from a dude and man has it had problems.
Currently, I am working on my power/compression. Manual says it should be around 199psi, my gauge is reading about 45psi. It will reach 45mph, but it really seems like it should have a little more kick to it. Kinda slow with two people.
I replaced both valves a month ago and grinded them with compound to (hopefully) seat well. I just replaced the piston rings with a new set. I have moved the timing chain over one tooth and it didn't make a difference. My gaskets are old but seem to not have any cracks or problems. It is also an old spark plug but it still works. Tomorrow I am planning on taking the cylinder apart again to see what I can find but I don't really know where all that pressure is going.
Any ideas?
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Post by pistonguy on Apr 20, 2017 21:21:24 GMT -5
Hey everybody. I bought the 91 Honda Elite 80 for $200 from a dude and man has it had problems. Currently, I am working on my power/compression. Manual says it should be around 199psi, my gauge is reading about 45psi. It will reach 45mph, but it really seems like it should have a little more kick to it. Kinda slow with two people. I replaced both valves a month ago and grinded them with compound to (hopefully) seat well. I just replaced the piston rings with a new set. I have moved the timing chain over one tooth and it didn't make a difference. My gaskets are old but seem to not have any cracks or problems. It is also an old spark plug but it still works. Tomorrow I am planning on taking the cylinder apart again to see what I can find but I don't really know where all that pressure is going. Any ideas? Did you use New Gaskets? Who and How did you Hone the Cylinder for the New Rings? have someone Competent Measure the Piston to Cylinder Clearance. The Bore/Piston may be clapped out and the new rings did nothing. Arr.rrrg, new Valves Old Seats and you used Grinding Compound, there Junk Now. Have a Competent person do a Proper Valve Job and Don't use Lapping/Grinding Compound. Your really going to need to find out why you only have 45psi Take and show me some pictures of the Piston and Cylinder etc. |
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Post by captaincodfish on Apr 22, 2017 3:34:06 GMT -5
Why would it matter new valves old seats? I can't replace the whole cylinder head. The grinding compound made the valves sit real nice and I followed directions from several sources. I don't know how else you would expect to seat them if you didn't use compound. The cylinder wasn't bored out, we did a measurement to check and the new rings fit. Also put some oil in the chamber when doing a compression test and it only increased the pressure by 5psi. The only thing I didn't do was get new gaskets so that is the next step. Stupid of me to forget to order them. Also I am using a crap compression reader from Harbor Freight so I am going to rent one from AutoZone tomorrow. Thanks for the input. I'll get some pictures.
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Post by pistonguy on Apr 22, 2017 8:41:49 GMT -5
Why would it matter new valves old seats? I can't replace the whole cylinder head. The grinding compound made the valves sit real nice and I followed directions from several sources. I don't know how else you would expect to seat them if you didn't use compound. The cylinder wasn't bored out, we did a measurement to check and the new rings fit. Also put some oil in the chamber when doing a compression test and it only increased the pressure by 5psi. The only thing I didn't do was get new gaskets so that is the next step. Stupid of me to forget to order them. Also I am using a crap compression reader from Harbor Freight so I am going to rent one from AutoZone tomorrow. Thanks for the input. I'll get some pictures. Nothing wrong with New Valves and Old Valve Seats, The Seats need to be Cut to a Precise Angle. The Valves have already been ground to a Precise angle, Upon start-up they will hammer home to a near perfect vacuum. Nothing Else needs to be done... Anyone how thinks that lapping or using grinding compound will make a proper Valve job better is Grossly Mistaken and Flat out Wrong. A Valve Cools itself Thru the Seat,When one Lapps or Worse uses Grinding compound you will make the Valve Face Concave and Now it Only Seals and can Cool in a upper and lower thin line as again the Face is now concave, This can be easily demonstrated by running the engine with lapped valves and the take it back apart, I can put a straight edge on the Valve Face and see Light in the middle of the face area were it is now Concave, The Valve cannot effectively cool itself and the seal is not very good. There is No Car,Bike,Tractor,Truck manufacture in the World that Lapps its valves at the factory, the reason why is above. Its just a bunch of old timer butchers that teaches you guys to lapp valves, monkey see monkey do. The only reason they still sell compound is fools still buy it. it can only be used to very lightly check your margin,I prefer to use machines Dye. I have spent my entire life working for a high end piston mfg and as of late a very high end Valve mfg. all we do is F-1, Cup, MotoGp etc, all Ti and some related components of Beryllium Copper seats, Ti retainers and cotters . What was the Piston to Cylinder clearance in mm or inch? What was he Ring end gap in mm or inch? Post up some pictures. Good Luck. |
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Post by captaincodfish on Apr 22, 2017 14:05:24 GMT -5
Interesting input pistonguy , thanks for the wisdom. I actually just tried the compression test with a tester from AutoZone and it reads about 150 psi. So Harbor Freight makes a TERRIBLE (no surprise there) compression tester. I just left my spark plug adapter at my apartment in Long Beach and Harbor has a great return policy and sells a compression tester set that comes with the proper adapter. So there you have it, I found the missing 100+ psi (though it still isn't *perfect). Now we are going to play around with the carb to see if we can enhance performance. |
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Post by pistonguy on Apr 22, 2017 19:28:18 GMT -5
Interesting input pistonguy , thanks for the wisdom. I actually just tried the compression test with a tester from AutoZone and it reads about 150 psi. So Harbor Freight makes a TERRIBLE (no surprise there) compression tester. I just left my spark plug adapter at my apartment in Long Beach and Harbor has a great return policy and sells a compression tester set that comes with the proper adapter. So there you have it, I found the missing 100+ psi (though it still isn't *perfect). Now we are going to play around with the carb to see if we can enhance performance. Fantastic!!!!!! 150psi is good. I know if it aint broke don't fix it but I'de really like to see new gaskets in her. I love it when a plan comes together!! Cheers!! |
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Honda Aero 50
