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Re: low compression after a overhaul???
Hi and welcome to FixYa,
Initially, check: presence of spark at the sparkplug tip/electrode; fuel entering the combustion chamber. You can check this by removing the air filter assembly and covering the mouth of the carb with the palm of your hand; it may also just be that the combustion chamber has too much 2T oil, try replacing you sparkplug.
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Then it could be because of carbon build-ups in your engine's combustion chamber. This is left behind with unburned fuel. It causes poor acceleration, a loss in power, lower top speed, and burns more fuel than it really has too. Not to mention causes smoke belching.
The best way to get rid of that would be to have a carbon ridding solution injected into
the combustion chamber. The solution will liquify the carbon and other build-ups,
which would then restore the "power" of your car. You'll get better
acceleration, higher rpm and top speed, save fuel, etc. have a mechanic do it for
you. It's alot cheaper and faster than having the engine overhauled (overhaul could trigger "loose compression").
High on mileage means that the engine has done a lot of work, possible that the compression is down, need to check if this is below level, if there is oil used in excess then the engine needs an overhauling subject to the cost estimated.
Cant compromise on bad fuel as this will bring down the power of the engine.
High fuleconsumption means poor setting so fuel and ignition , check fuel settings- pump calibration and timing.
The Honda Splendor has a 4 stroke engine and can have worn valve seals or rings. If the engine smokes while riding it may be time for a top end re-build. You should complete a compression test to evaluate the condition of the piston and valves. If the compression is low ( under 120 psi ) it is time for a top end re-build.
Squirt oil in your cylinders and recheck the compression. If your compression goes up you have bad rings. Check your valve tolerances to make sure that the valves are not being held open only because they are adjusted too tight. This would cause compression loss. If the valves were bent because the timing belts slipped or broke You may have to replace the valves to get compression back up. If the engine has low compression because there are 300,000 miles on the bike you may just need a complete overhaul or a new motorcycle. If you had at least 110 compression on all cylinders and they were all with in 10 pounds of each other you could still be riding on low octane fuel.
65PSI is way to low. It probably won’t run at 88PSI either. Put a small drop of engine oil (20w50 or similar) into the cylinder and do the compression test again. If there is a big improvement in compression it means the piston rings are worn and you will have to do a top-end overhaul. As a very rough guide you need 150PSI for a 4 stroke engine and about 120PSI for a 2 stroke engine.