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Fuzzy- I am saying that when the piston is TDC then my blade is parallel to the direction of movement of the piston in it's cylinder. In the other engines, when piston is at TDC then the blade at that point is perpendicular to the direction of movement of the piston in it's cylinder. Actually I...

Fuzzy, The blade is parallel to the piston for this f engine per the manual. I put the "new" blade mounting flange on and again no affect. I think I have run out of ideas.

I took mower to my Lawn Boy mechanic this morning and ran it for him and he said that the degree of vibration I have is the nature of the F engine vs the 1973 D engine model I used to have that had little to no vibration. I took it to another Lawn Boy dealer across town and ran it for him and he...

I took an outside caliper and measured the height of the blade at the 4 different points around the circle. All checked good. Within a sixteenth inch at most. I then took the blade off and rotated it 180 degrees. No improvement. Unless someone has another suggestion I'm going to take this to my...

Again guys, thanks for all the help. The blade I have does not have the two notches in it on the trailing edges like the ones I've seen for sale on Amazon etc. It does have the built in stiffener (edges of center area curved up 1/4" or so, and embossed laterals on each side of center hole, for...

Many thanks for that manual Matt.

Thanks to all you guys for helping me out on this. I truly appreciate it! To answer your questions to me: Yes the engine goes up and down when cutting. The vibration is OK when it is down mode but is excessive when it surges. The surging to high rpm causes the excessive vibration. Vibrates most...

I did the pop can between the crankshaft and the triangle plate and that did not improve it. Any other ideas?

Thanks to both of you. I will try this today. I hope a Pepsi can works as well. I'll keep you posted.

Brand new blade and I checked the balance before I put it on.

Mark, it is a model 7268, serial 9790726. Runs strong and the deck is in near perfect shape but for some reason it vibrates a lot when the engine is running fairly fast.

Hi guys. Thank for I need your help again. I bought a model 7268 used 2 weeks ago to mow my acre of hills. It ram fine but vibrated a lot. I replaced the blade with a new one and that may have helped a little but not much. All the vanes are still in place on the flywheel and all the magnets. I...

Don't get one with dog drive. Slip too much. I had 69 and 73 models and both had dog drive and both slipped in wet grass when the wheels were wet. The 69 model year had a rubber band size belt off top of flywheel that ran down to drive dog shaft. Looked junky but I guess it always worked, except...

OK. I used some boat trailer axle grease to make needles stick and got the rod re-attached using the 33 needles. Now can anyone tell this rookie what kind of stuff the factory is using on the threads of the 4 bolts that hold the crankcasse together? Some kind of white looking stuff. Is that...

Thanks for the info about the grease stick. I have never heard of such an animal. I hope plain grease works since I have no grease stick.

I am new here and new to Lawn Boy fixit. I am replacing crankshaft on model 7268 and need to know how many needles should be in rod bearing. Also, the best way to put them back in place now that I got this thing torn apart. I have 33 needles which are presently soaking in rubbing alcohol to...