Wow, that looks awesome!
I need to decide whether to go further or just set the timing as best I can, run the big sprocket, and sell it in the spring.
I would hate for the next guy to fry it from too much advance though.
Parting it out might be more responsible.
Going to put it away for a time and move on to other projects before I decide.
The Superhawk from hell...More info. Interesting because my compression on the fresh rebuild is indeed only at 150.
Motorcycle Repair/CB77 too much advance Advertisement Expert: Bill Silver - 12/9/2012 Question I cannot set my timing as per your book (which is awesome!) If I set the timing at F or even T, then at full advance I am well past the two marks. If I set it back to not exceed the marks, then it is left of T and will barely start and run poorly at low speed. It also bogs down off the line badly unless the timing is at least advanced well past F, which again leaves me way past the two marks at full advance. The top end is new, the advance springs replaced, sprocket weights have black rubber intact. Electronic iginition. Stock carbs, pistons, cam, etc. I suspect its the advance sprocket, but it seems to spec. Is there any kind of fixed advancer that can be fitted? I see reference to one option in the book. Thanks for all you do to keep these bikes on the road! Get the answer below Sponsored Links What's Your Honda Worth? Value Your Honda Online Instantly We Buy All Honda Models Old and New www.webuyanycar.com/honda Honda Element Price All New Element Models Schedule A Test Drive Online! www.fairfaxhonda.com/Element Honda Dealer Huge Selection & Amazing Prices. Call Us Today! 703-596-9737 www.hendrickhondava.com Answer Jon, did you set the cam timing correctly? It is easy to get it off about a half-tooth and the cam timing runs late. I have found that if you loosen all the rocker arm tappet screws first, then tighten the right side screws by hand, just enough to lock the camshaft/sprocket in the dead horizontal position, then the cam chain will generally line up okay and cam timing is correct. Check your compression readings. If they are down about 150-160 on a fresh top end, then the cam timing is late. Normal compression readings should be right around 175 psi. The other factor that can affect the ignition timing is a loose point cam shaft, which runs inside the right camshaft. If you have side play, often around .005-.007" the wobble sets up some ignition timing problems. Sometimes the camsprocket advancer weight pivot pins wear, as well as the holes in the weights, so there is some extra slop in the whole system which increases the total spark advance excessively. Make sure that the sprocket, itself, isn't loose on the rivets which hold the whole assembly together. I assume you have a CB advancer and not one from a CA installed. The length of the weights is longer on the CAs, then the CB series to increase the advance curve speed, along with lighter springs. I have found that #140 main jets help perk up these bikes, as well. I had 100 of them made up at Keyster and have a few left for sale, if you need them. Put the needles at the #4 slot, too. I think I have mine all the way up in #5, but it depends on your altitude and humidity, etc. Bill Silver Not too long ago on Ebay there was an NOS advancer unit with a buy it now of $200, I don't remember what year and I can't find it now. Currently there are two used 61' advancers on Ebay but unable to tell what is condition of either. If you haven't already, I would contact Ed Moore and see what he has available. Cliff
Turns out she is off one tooth on the cam sprocket.
I was worried about screwing this up (see above) and I did. LM walked me through it, and I am in the middle of setting it straight. For others that follow, I think I lined up the rotor at F rather than T, and then lined the cam at 12pm and the sprocket at 12pm. This is easy to do because 99% of the time when you are lining up the rotar its for timing, which means you are looking for F. I think I instinctively set it up on F rather than T and ended up with the cam off. We wont know for sure until I put it together and fire it up. Well, it is back together and runs.
It no longer needs full advance on the timing plate, and its not advancing past the two hash marks. So, it appears it was a tooth off AND we got it back on the right tooth. It was a tricky business, and if your cam sprocket is sitting just shy of level with the rotor at TDC, then you are going to want to talk to LM about jumping the chain one tooth down on the crankshaft and then trying again. I am not sure why it works, but it does. I have some hesitation between idle and 3/4 throttle, but I think I need to move a needle setting or tune some with the air screws. I think I am making progress. Only time will tell. I also feel like I know an awful lot about this bike now. I hope I can help someone else with their project. I would hate all this suffering to go to waste!
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