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How to bring engine in compression in self start also?

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Posted on Jul 16, 2013

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I have changed self start motor ,coils and battery all are new but the bike is not starting in self it is aking the stroke but the power to plug is not sufficient


low cc engines

if spark is at the plug
not much left to replace

fuel delivery blockage
loss of compression
is the timing out

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Apr 27, 2017 | Power Motorcycles

1 Answer

Firing order for rocam1.6


A six cylinder in-line engine has a power impulse every 720 degrees/6 i.e. 120 degrees of crankshaft rotation. The crankshaft has six crank-throws placed at 120 degrees out of phase with one another, which can be arranged only in three planes. Therefore, the crankpin phasing is arranged in pairs. For heavy-duty diesel engines, seven journals and bearings are provided, at each end and between adjacent crankpins. For petrol engines only 4 or 5 main journals are provided. The firing order with the crankshaft arrangement shown in the attached figure is considered. With piston 1 at the top of the compression stroke, its opposite piston 6 is at the top of its exhaust stroke. Rotation of crankshaft through 120 degrees brings pistons 2 and 5 to their TDC and either one of these can be arrangement to complete a compression stroke. If piston 5 is arranged to be at the end of compression and at the start of its power stroke, then piston 2 must be on its exhaust stroke. Rotation of crankshaft through second 120 degrees positions pistons 3 and 4 at the TDC, so either one of these can be on the compression stroke. If piston 3 is made to be on compression, piston 4 must be on its exhaust stroke. A third rotation of 120 degrees brings pistons 1 and 6 back again to TDC, where piston 6 is arranged to be on the compression and piston 1, therefore, be on its exhaust stroke. A fourth 120 degrees rotation brings pistons 2 and 5 to their TDC. Piston 2 is now on its compression and piston 5 on its exhaust stroke. Rotation of crankshaft through fifth 120 degrees brings piston 3 and 4 to TDC. Piston 4 is on compression and piston 3 on its exhaust stroke. Final rotation of 120 degrees completes the 720 degrees displacement of crankshaft and brings the pistons into positions for the next cycle. This cycle provides a firing order of 1, 5, 3, 6, 2, 4. If the phasing of paired crank-throws 3 and 4 and 2 and 5 are interchanged, then a second equally suitable firing-order of 1, 4, 2, 6, 3, 5 is achieved. This arrangement provides excellent dynamic balance and evenness of torque, and is preferred for engines larger than 2.5 liters provided length is not a prime consideration.

Sep 28, 2016 | Cars & Trucks

1 Answer

I have a chevy cavalier and it was overheating then is shut off its self and now it will turn over and its getting gas and fire but wont start why


How long was it over heating ? Could have fried the engine , an it could still turn over ! Need to have a compression test done ! An internal combustion engine needs three things to run , spark , fuel an compression !

Feb 14, 2015 | Cars & Trucks

2 Answers

Firing order on distubutor cap where does it start


take #1 spark plug out and bring the piston up to the top of the compression stroke (turn the engine over with your finger over the hole, when pressure in present, that is compression stroke) remove the distibutor cap and note where the rotor is pointed, that will be #1 plug, you have a chevy so the plugs wires go on the distributor clock wise, usaully it's pointing at the #1 cylinder

Jul 29, 2011 | Chevrolet 2500 Cars & Trucks

1 Answer

My Briggs & Stratton Quantum 65 starts perfectly from cold but refuses to re-start when hot. Any ideas?


Do a compression check when cold, then again when hot. Sounds like when its hot your losing compression. If this is the case, it won't want to start when hot. Compression should be above 60 lbs. Thats where i would start. I hope this is of some help to you.

May 29, 2010 | Briggs & Stratton Lawn-Boy Insight Series...

2 Answers

B & S 10D902 lack of compression when starting


may have broke crank newer mowers are not built as they use to be take out plug and place finger over hole to test for compression if none u broke more than likely the crank

May 05, 2010 | Briggs & Stratton Lawn-Boy Insight Series...

1 Answer

1994 camry, won't start. Engine turns over freely, good spark on new plugs, Injectors switching ( tested with light bulb) plugs wet with petrol, checked timing belt, but ok and timing marks line up?


if you have spark and fuel and it is on time it should run if the compression is high enough was this car flooded really bad if so make sure your oil is OK the do a compression check dry and wet you may find when you you do your wet test that it brings the compression up enough to git the car started that would mean that your cylinders were washed out with gas causing the compression to go down

May 03, 2010 | 1994 Toyota Camry

1 Answer

Lost OM, starting question - Homelite 10655 chain saw


The compression release should be a metal button that projects from the cylinder head and extends out from the cylinder cover so that it can be depressed before starting. There should be an immediate lessening of compression when pushed. If no such result, the release mechanism should be removed and cleaned, or replaced. Proper starting is to pump the primer button several times to fill the bulb with fuel, then set the choke closed, the ignition on and set the fast idle on the throttle. Pull the engine through several times until it pops, then release the choke part way, and try to start. Don't pull the throttle during this as it will release the fast idle setting. Once the engine fires, the compression release should self-reset for maximum compression. Hope this makes sense and helps!

Apr 21, 2010 | Homelite Consumer Products 9.0 Amp, 14 In....

2 Answers

1990 318i engine no compression yet timing chain ok cam and lifters working pistons going up and down has spark 0 compression wont start


I suggest you bring the pistons to TDC, one at time on the comprssion stroke and do a "cylinder leakage test". Put compressed air into the spark plug hose and try to detect where the air is going. If you have the piston exactly at TDC, it will stay there when you put conpressed air in the hole, if it's off a little it will push the piston down. If you have the valve cover off you can watch the valves to determine if you have the pistons on the compression stroke. You should be able to buy a fitting from an auto parts store that will thread into the spark plug hole. If not take an old spark plug and bust the guts out of it and weld a pipe fitting to it to adapt your air compressor hose.

Mar 07, 2010 | 1996 BMW 318

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