DaveyDaveDaveDave Posted February 13, 2012 Report Share Posted February 13, 2012 Just bought a sweet 77 KC. It has an impressively loud valve tick and had an impressive amount of gas in the oil. Changed the oil before driving it home, and sure enough, its full of gas. In like 35 miles. Ive heard of fuel pumps doing this, but from reading around on the forum, it doesnt seem to be a common issue. Motor is peppy and fires right up, so Im not guessing rings, but havent done a compression check. Any other ideas? Quote Link to comment
banzai510(hainz) Posted February 13, 2012 Report Share Posted February 13, 2012 Why dont you change the fuel pump!!!!!!!!!!!!!!!!!!!!Esp if its a mechanical!!!!!!!!!! what other ideas you looking for?????????? adjust the valave lash. and see if the tick goes away Quote Link to comment
Stupid_fast Posted February 13, 2012 Report Share Posted February 13, 2012 Fuel pump. Quote Link to comment
josh_t Posted February 13, 2012 Report Share Posted February 13, 2012 It's been impressed upon me that its the fuel pump. Its probably a cracked diaphragm. Thats what was wrong with mine. Quote Link to comment
paradoxx Posted February 13, 2012 Report Share Posted February 13, 2012 the diaphragm is gone.....when they start to spit oil and gas from one side is time to change before it screws everything. Quote Link to comment
banzai510(hainz) Posted February 13, 2012 Report Share Posted February 13, 2012 Schucks(O rileys will have the cheap fuel pumps with the gold tops. fro about 29-35dollars. They work good enough unless you wan stock OEM. for local stores I like Carquest the best if one is near by you. Quote Link to comment
yankeedatsundoo Posted February 13, 2012 Report Share Posted February 13, 2012 That happen to me but it wasnt the pump it was my carb that was giving out. Quote Link to comment
DaveyDaveDaveDave Posted February 13, 2012 Author Report Share Posted February 13, 2012 Well, new fuel pump and valves/lifters getting checked and weber this thurs or fri. Its been two years since I had a datto and damn, its good to have one again. A friend of mine (waaaay better at this shit than me) said the hydraulic tensioner may have something to do with the tick. Thin oil means low pressure and low tension on the chain and may lead to the tick as well? Quote Link to comment
Skib Posted February 13, 2012 Report Share Posted February 13, 2012 said the hydraulic tensioner may have something to do with the tick. Thin oil means low pressure and low tension on the chain and may lead to the tick as well? all the lifters are solid (non hydraulic) and the chain tensioner is just spring loaded.... Quote Link to comment
banzai510(hainz) Posted February 13, 2012 Report Share Posted February 13, 2012 and the chain tensioner is just spring loaded.... Well there is a hole for oil to push the tensioner also. tensioer would make more a grinding sound as once it wears out its constant metal grinding. But could maybe be a loose slack side guide shacking around. but more likely its a valve lash adjustment. Dave if the stock carb works fine just run it. and get a weber and just save it. If I had a stock carb that works I would run it. they are smooth and halfway decent on the gas milage and quiet with the stock aircleaner. Polish that red paint and just roll it.Ok lower it also Quote Link to comment
datzenmike Posted February 13, 2012 Report Share Posted February 13, 2012 A constant and even tick would likely be a lifter adjustment. A tensioner is more of a random rattle. Many 720 guys say the chain rattle is a Z series's way of saying it's time to change the oil. :lol: Quote Link to comment
elmerfudpucker Posted February 13, 2012 Report Share Posted February 13, 2012 A constant and even tick would likely be a lifter adjustment. A tensioner is more of a random rattle. Many 720 guys say the chain rattle is a Z series's way of saying it's time to change the oil. :lol: Hey! I resent that remark! lol Quote Link to comment
hang_510 Posted February 14, 2012 Report Share Posted February 14, 2012 the chain rattle is a Z series's way of saying it's time to change the oil. :lol: sometimes it just says add a qt, or 3. Quote Link to comment
DaveyDaveDaveDave Posted February 17, 2012 Author Report Share Posted February 17, 2012 New pump in, new tires collected. Tomorrow gets new oil and valves adjusted. Quote Link to comment
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