Hello! I have a question about the lower timing sprocket.

[Jake99superhawk]

Hello everybody, I'm a new member from the US. I live in Pennsylvania and have a 99 Superhawk. I bought the bike from a friend who had it in his garage for the last 3 years with a front timing chain failure. I have been trying to get it going again, but I keep finding more problems. The last thing I need to figure out is if it is possible to remove the lower timing chain sprocket? The one on the crankshaft behind the stator and starter clutch/gears. If it is possible how would I go about doing it? Any help would be greatly appreciated, I have been searching for an answer to this question all weekend.

[templ8]

It's not removable, it's a machined part of the crankshaft.

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[templ8]

Are you sure it's a chain failure or the common chain tensioner failure ?

Welcome to the forum [WHITE SMILING FACE]

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[Jake99superhawk]

Yeah, it's a bit of a mistery what actually happened. My buddy that I bought the bike from has owned it since it was new, and after it jumped time on him he put manual chain tensioners on it. All was good for 5 or 6 years after that, until he let his step son use it one summer. He had already bought a new 1000rr, so the hawk was just a spare bike at the time. Anyways he said that it just shut off on him while he was riding to work one day back in 2011. Took it apart and all the valves were bent and that it somehow jumped time. He just left it sit in his garage after that until I bought it from him a couple months ago. I bought new parts and rebuilt the head. Had new valves, guides, seats, seals put in it and put it all back together. I adjusted the tensioner so that there was 5mm of up and down play in the chain like the manual said and took it for a ride. I went about a mile with it and lost power in the front cylinder again. Took it back apart and discovered that the timing chain had snapped, bending the exahust valves in the process. I couldn't figure out for the life of me why that would have happened so I pulled the stator cover and flywheel to look at the lower sprocket and chain guides. Once I got in there I found a steel rivet of some kind sitting on the chain guide, it had obviously gotten pulled into the lower cam sprocket broke the timing chain and two of the teath off of the sprocket. I got a good used head and timing chain off of Ebay this time, but I can't figure out how to fix the lower sprocket. Or where in the world that steel rivet came from and how it got into the timing chain. I'll put some pictures up to show you all what I mean if someone can explain how to upload them?

[MacV2]

New engine time, not worth the hassle of even trying to repair it just stick a 2nd hand lump in it...

[Jake99superhawk]

Unfortunately I don't have enough money to buy another engine. I had to quit my job and take a $6/ hr pay cut in order to have a set constant schedule at work. I have a 3 year old son that I am having to raise by myself. His mother became addicted to prescription drugs, she left us and ran off with a drug peddler last summer. Haven't seen her since. I have to pay baby sitters to watch him every day when I'm at work, and it's a challenge to pay all the bills every month as is. I'm happy that I have him here with me and I know he is safe, but it is a struggle financially to make ends meet. That's part of the reason I need to get this bike going, it will save me about $70 a week in fuel costs getting to work and back. But that's my story, weather you wanted to hear it or not!

[Jake99superhawk]

I am a very good experienced tig welder, do you all think it would be possible to build the missing teath back up with weld and machine new teath on there? I have a axcess to a machine shop at work as well as every kind of welder under the sun.

[Wicky]

No expert delving in that deep but you'll need to split the crankcases and fit a new crankshaft (with intact teeth) and matching bearings



http://www.superhawkforum.com/forums/cl ... aft-33186/

Compared to that fitting a secondhand engine would be more plug'n'play.

[MacV2]

No expert delving in that deep but you'll need to split the crankcases and fit a new crankshaft (with intact teeth) and matching bearings



http://www.superhawkforum.com/forums/cl ... aft-33186/

Compared to that fitting a secondhand engine would be more plug'n'play.

Not to mention the cost of all the other bits you will need to get it going again...

Oh & if you think the Storm will save you money on gas mileage...think again...

[tony.mon]

Agreed, a 2nd hand crank is what's needed.
You will also need to factor in the cost of new main bearing and big end shells, and of course a new cam chain, two new head gaskets plus the head rebuild bits.

Unless yours is a low mileage (less than 10K) engine, a 2nd hand engine is going to be cheaper.

See if you can buy a crashed one and scavenge the engine, any other bits left over can then be sold.

[CruxGNZ]

Agreed, a 2nd hand crank is what's needed.
You will also need to factor in the cost of new main bearing and big end shells, and of course a new cam chain, two new head gaskets plus the head rebuild bits.

Unless yours is a low mileage (less than 10K) engine, a 2nd hand engine is going to be cheaper.

See if you can buy a crashed one and scavenge the engine, any other bits left over can then be sold.

If I was in your position, this seems the best route. You can at least make your money back and maybe more depending on the condition of the bike you find.

[darkember]

The rivet thing you mentioned may have been one of the collets that could have dislodged and dropped down the tunnel