dek 11hp engine question

[Lawnranger]

I had it off when i pulled the flywheel . You can turn it by hand but turning it that way is so slow compaired to pulling the rope . It seemed like it turned a little easier . But when i put a different dek top on it it still binds up . Maybe its the cup because when o took the top off i pulled the top and it pulls fine . It also pulls fine without the spark plug so i def think its compression related

I thought you said the crankshaft would not make a complete cycle. I must have misunderstood. If you can pull the starter rope to full extension with the spark plug removed then maybe something in the starter assembly is binding up under the stress of compression?

 

[jetrail]

If you pull it like trying to start it. It will tighten up or build up so much compression but it you slowly pull it takes pretty much most of your strength it will pull through but its so bad the handle bends . That has been the case with both starter tops on it . I didnt try a different starter cup yet

 

[Lawnranger]

Does the engine have a compression release? You will have to search online using your engine numbers for an illustrated parts list to see if there is an automatic compression release on the camshaft similar to what Briggs & Stratton uses. Could be just the valves out of adjustment if it is an OHV engine. Sorry, I'm not familiar with dek engines. Is this engine a chinese knock off of honda?

 

[chance123]

There a couple of Kawasaki engines with high compression/hard to pull even with the release. I instruct my clients to pull the rope slowly until the compression stroke. Then pull HARD. The flywheel effect will give it the momentum to sustain rotation

 

[jetrail]

Lawnranger, i tried a different spark plug and got the same result . It is a chinese motor . They use these on stanley generators and brush master chippers . Im not sure if it has a compression release. Ive looked and havent seen anything . The owner said it pulled great the two times he used it and then it started doing this . Either way he doesnt want to replace the motor and said i can have it . Its a 900.00 chipper with a crap motor lol . The thing has the ruixxing carb on it but its 11 hp and replacing it wont be cheap

 

[Lawnranger]

You can try removing the valve cover and watch the valve/rocker movement as you slowly rotate the flywheel by hand (spark plug removed). The intake should open as the piston goes down and then close. Next the piston comes up (compression stroke) and both valves should be closed. Then the piston goes down (power stroke) and followed by the piston coming up and the exhaust valve opening. This completes the four strokes of a four stroke engine. Now, if you watch very closely at the valve movement on the compression stroke, you will see one of the valves open just slightly and close again. This movement is very slight and you have to pay attention while the piston is coming up on the compression stroke. If the valve moves slightly you have a compression release but if the valve doesn't move you still may have a CR but the valves could be out of adjustment so find the proper procedure for setting valve clearance and follow it exactly.

Good luck.

 

[jetrail]

I got the correct clearance and set the valves sat and that didnt help . I thought it would

 

[Lawnranger]

I've gone through and reread all the posts from the beginning. If this engine had an automatic compression release and it broke, you would have the symptom you are experiencing. Do you have an illustrated parts list for this engine? If so, will you post it so I can have a look? Again, I'm not familiar with Dek specifically but if it is a clone of Honda's it will be similar.

Another thought just came to me - did you check for a bent/broken push rod? I had a Briggs engine that had a completely severed push rod but the engine still ran, just with reduced power. I know it's a long shot but worth checking.

Post the IPL if you can.

 

[jetrail]

Ok ill see what they have . I signed up to do service repairs for dek( stupid move on my part lol ) and every motor that has came through has left me wondering if they are worth a dime . They are just a chinese engine with a name . Ill check on that parts list.

 

[chance123]

did you check for a bent/broken push rod? I had a Briggs engine that had a completely severed push rod but the engine still ran, just with reduced power. .

HUH? I must be missing something here. A broken pushrod would not allow either the intake or the exhaust valve to function making it impossible to run.