leak of compression?

[Mailo]

Hello friends!! well the other day i noticed that if i slowly turn the engine with the kickstart ( not kicking it, only with my hand very slow ) i feel the vaccum that its supossed to be for the admission phase, but then i feel a blow in the hand. may it be becouse im restricting the air to enter in the cylinder and then i feel it flowing from the exhaust to my hand? or my it be leak of comrpession ? bad timing?

 

[GSX1000E]

Have you adjusted the valves?

 

[Mailo]

Have you adjusted the valves?

no i have not, i purchased the bike 2 weeks ago and im still wiring it.

sorry i didnt told you its a GS 400

 

[Mailo]

Well i took off the valve cover and saw that the piston STARTS compression with the intake valves opened. is that normal (overlapped cam timing ) ? or are they in the wrong possition?

 

[GSX1000E]

There is tons of information here as well as a factory repair manual for your bike: http://members.dslextreme.com/users/bikecliff/
Cleaning the wiring, cleaning the carbs and adjusting the valves are the most important things to do to bring these wonderful bikes back to life.
New tires and good working brakes come a short while later.

 

[Mailo]

Yes i have the service manuals but i still dont know if that's normal

that the compression phase begins with open intake valves, and some of the compression goes to the intake

 

[Gorminrider]

Hello friends!! well the other day i noticed that if i slowly turn the engine with the kickstart ( not kicking it, only with my hand very slow ) i feel the vaccum that its supossed to be for the admission phase, but then i feel a blow in the hand. may it be becouse im restricting the air to enter in the cylinder and then i feel it flowing from the exhaust to my hand? or my it be leak of comrpession ? bad timing?

It does sound odd, Mailo. As to how much it will kick your hand off the intake, your best bet is still to compare your engine to the manual or more manuals. (The real OEM Suzuki shop manual would be the one to find! You can't have too many manuals! because there are differences between them in what they show clearly.)
I am "out of my depth" here- but I know that engines are not so simple as to allow a simple explanation- valve overlap is a likely explanation of what you see slowly rotating the crank.
http://www.challengers101.com/IntakeTuning.html

Meanwhile, because I know you are putting an old bike back into service, while checking and adjusting the valves, ask "What could cause the thing I fear?" These checks may put your mind at rest. Is the cam chain tensioner adjusted, stuck or broken or is the chain much worn? or has that cam chain moved a tooth?
A bad chain would have all the valves wrong...not just the intake. Perhaps just one valve is sticking?

 

[Mailo]

It does sound odd, Mailo. As to how much it will kick your hand off the intake, your best bet is still to compare your engine to the manual or more manuals. (The real OEM Suzuki shop manual would be the one to find! You can't have too many manuals! because there are differences between them in what they show clearly.)
I am "out of my depth" here- but I know that engines are not so simple as to allow a simple explanation- valve overlap is a likely explanation of what you see slowly rotating the crank.
http://www.challengers101.com/IntakeTuning.html

Meanwhile, because I know you are putting an old bike back into service, while checking and adjusting the valves, ask "What could cause the thing I fear?" These checks may put your mind at rest. Is the cam chain tensioner adjusted, stuck or broken or is the chain much worn? or has that cam chain moved a tooth?
A bad chain would have all the valves wrong...not just the intake. Perhaps just one valve is sticking?

I take off the valve cover and i saw that the compression phase starts with the intake valves opened so it spits throught the intake nozzles, i tought it could be the valve timing overlap. and when the engine goes at normal speed ( not slowly rotating with the hands) this effect will be dismised.
But is a reasonable explaination that the camshaft may don't be in good timing.

This thing happens in both cylincers equally so i think its the intake camshaft that is not in the right possition.