Fantastic videos. I have watched all 6 of your maintenance videos and have found them extremely well made and very helpful. Best motorcycle maintenance videos on youtube!! Please make some more. Cheers from Canada.
Hello nreid99 Thank you for such a lovely comment, I like you already! Do you have an R-Series Boxer? What sort of jobs would you like to see covered by a video? Take Care Jim
Hello Anthony. Thank you for commenting on my videos, and well done for sitting through six of them! I do hope they have helped you with the servicing of your R80, its a good bike and if looked after will last for years and years. Take Care Jim
Jim, I really like your videos about working on the old Boxer. I've just acquired an R75/6. Have you made one that shows how to carry out a compression test?
@@PhilipCritchlow Hello Philip, thank you for your comment. I’m sorry but I haven’t made a video showing how to perform a compression test. It’s not a difficult thing to do if you have, or can hire a compression tester. Remove both spark plugs, don’t add any oil into the cylinder through the spark plug hole at this time. screw the compression tester into one of the spark plug holes. Make sure the compression meter is reading zero then turn the engine over 4 or 5 times. The pressure should rise to round about 95 or 100 psi. Do this test on both cylinders making a note of the pressures obtained. Now if the pressure is very much lower on one cylinder than the other, it’s either a problem with the cylinder-piston-or piston rings or the valves in the head of that cylinder. You will be able to get more information by doing the following. Keep the spark plugs out of both cylinders, squirt a little oil into the spark plug hole of the cylinder with low pressure. Turn the engine over a couple of times with a rag over the spark plug hole. This will ensure you have not placed too much oil in the cylinder. Next connect the compression tester to that cylinder. Zero the pressure gauge and then turn the engine over 4 or 5 times. If the low compression was due to cylinder-piston or piston rings being worn the cylinder pressure will have increased a lot due to the oil filling gaps. If the pressure remains low then that could indicate one or both valves need to be serviced. I hope this helps. Please let me know how you get on. Take Care Jim
@@PhilipCritchlow Hello again, a petrol engine has a carburettor, with the throttle closed the carb will restrict the air going into the cylinder, this may affect the reading of the compression tester. I had forgotten about this. To prevent any miss-readings it would be best to remove the carburettors from the rear of the cylinder. You will not have to remove any of the cables so it’s not a big job. Hope that helps. Jim
@@PhilipCritchlow The bing carburettor is a Constant Velocity carburettor . Your hand throttle opens a butterfly in the carb, but between that and the input of the carb is a diaphragm operated carburettor slide which remains closed. The slide is pulled up by the diaphragm which is operated by the vacuum of that cylinder as the engine runs. Therefore to get a true reading from the compression tester it’s best to remove the carburettor, that way there will be no restriction to the air flow going into the cylinder. Hope that helps. Jim
Hello Alan Two comments in one day, thank you so much, I'm glad your enjoying the videos. The TH-cam algorithm look to see how many comments and likes a video gets, the more that arrive, the more the algorithm like it, and the more new users it will show it to. Take Care Jim
I have a 1973 75/5 and your videos are hugely helpful and so well done. Thanks so much!!
Hello @egect1, Thank you for your kind words, I am so glad you find my videos useful. Thank you for your comment. Take Care Jim
Fantastic videos. I have watched all 6 of your maintenance videos and have found them extremely well made and very helpful. Best motorcycle maintenance videos on youtube!! Please make some more. Cheers from Canada.
Hello nreid99
Thank you for such a lovely comment, I like you already!
Do you have an R-Series Boxer? What sort of jobs would you like to see covered by a video?
Take Care
Jim
Thanks again from Michigan, U.S.A. This video answered a number of problems.
Hello again Don. Thank you for your comment. I'm glad you found something useful in this video. Take Care Jim
Great videos JIm! After viewing all six, I'm thinking, "of course I can!" Looking forward to working on my R80/7!
Hello Anthony. Thank you for commenting on my videos, and well done for sitting through six of them! I do hope they have helped you with the servicing of your R80, its a good bike and if looked after will last for years and years. Take Care Jim
Jim, I really like your videos about working on the old Boxer. I've just acquired an R75/6. Have you made one that shows how to carry out a compression test?
@@PhilipCritchlow
Hello Philip, thank you for your comment. I’m sorry but I haven’t made a video showing how to perform a compression test. It’s not a difficult thing to do if you have, or can hire a compression tester. Remove both spark plugs, don’t add any oil into the cylinder through the spark plug hole at this time. screw the compression tester into one of the spark plug holes. Make sure the compression meter is reading zero then turn the engine over 4 or 5 times. The pressure should rise to round about 95 or 100 psi. Do this test on both cylinders making a note of the pressures obtained. Now if the pressure is very much lower on one cylinder than the other, it’s either a problem with the cylinder-piston-or piston rings or the valves in the head of that cylinder. You will be able to get more information by doing the following. Keep the spark plugs out of both cylinders, squirt a little oil into the spark plug hole of the cylinder with low pressure. Turn the engine over a couple of times with a rag over the spark plug hole. This will ensure you have not placed too much oil in the cylinder. Next connect the compression tester to that cylinder. Zero the pressure gauge and then turn the engine over 4 or 5 times. If the low compression was due to cylinder-piston or piston rings being worn the cylinder pressure will have increased a lot due to the oil filling gaps. If the pressure remains low then that could indicate one or both valves need to be serviced. I hope this helps. Please let me know how you get on. Take Care Jim
@CYC123 Thanks for this, Jim. Some people, and the Haynes manual, say take off the carbs. Any idea why?
@@PhilipCritchlow Hello again, a petrol engine has a carburettor, with the throttle closed the carb will restrict the air going into the cylinder, this may affect the reading of the compression tester. I had forgotten about this. To prevent any miss-readings it would be best to remove the carburettors from the rear of the cylinder. You will not have to remove any of the cables so it’s not a big job. Hope that helps. Jim
@CYC123 Thanks Jim, but why not just open the throttle?
@@PhilipCritchlow The bing carburettor is a Constant Velocity carburettor . Your hand throttle opens a butterfly in the carb, but between that and the input of the carb is a diaphragm operated carburettor slide which remains closed. The slide is pulled up by the diaphragm which is operated by the vacuum of that cylinder as the engine runs. Therefore to get a true reading from the compression tester it’s best to remove the carburettor, that way there will be no restriction to the air flow going into the cylinder. Hope that helps. Jim
Nice one!!!
Hello Alan
Two comments in one day, thank you so much, I'm glad your enjoying the videos.
The TH-cam algorithm look to see how many comments and likes a video gets, the more that arrive, the more the algorithm like it, and the more new users it will show it to. Take Care Jim