RooR Posted October 14, 2014 Report Share Posted October 14, 2014 I just got my banshee put back together after porting and adding a cool head. it started right up...idles fine sounds good except there is a noticeable rattling/vibration...also im not sure that it is circulating coolant the coolant lines feel limp.... the bottom end seemed really tight when i took it apart and the water pump was fine. do I have to prime the cooling system? I am worried that my chariot cool head didnt seal properly...also wondering if the crank could be out of true? Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted October 14, 2014 Report Share Posted October 14, 2014 Was there a reason it was apart such as siezing a piston? Quote Link to comment Share on other sites More sharing options...
RooR Posted October 14, 2014 Author Report Share Posted October 14, 2014 the pistons never seized just very low compression...they were the stock bore pistons Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted October 14, 2014 Report Share Posted October 14, 2014 Leak down test or pressure test on the cooling system? What size domes, who did the porting... edges chamfered? Quote Link to comment Share on other sites More sharing options...
RooR Posted October 14, 2014 Author Report Share Posted October 14, 2014 (edited) how would a leak cause a vibration when it runs fine? 19cc domes on 110octane +4 timing ported by HJR everything chamfered to me it doesn't seem like the coolant system is circulating at all...there is coolant in the line up by the pump cover the vibration isn't very abrupt...more subtle but i definitely notice it no noticeable white smoke to indicate leaking coolant? Edited October 14, 2014 by RooR Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted October 14, 2014 Report Share Posted October 14, 2014 Didn't say a coolant leak is causing vibration, just getting the picture all together because of 2 different concerns. How far apart did you have it? Did you pull the flywheel, take the clutch apart? Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted October 14, 2014 Report Share Posted October 14, 2014 take a hose off for a couple of secs, see if its pumping Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted October 14, 2014 Report Share Posted October 14, 2014 You wouldn't need to prime the cooling system. There's a vent tube that goes from the head to the radiator that helps purge the air out Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted October 14, 2014 Report Share Posted October 14, 2014 dudes first banshee, you know these things do vibrate a bit, its not a ballanced motor 1 Quote Link to comment Share on other sites More sharing options...
RooR Posted October 14, 2014 Author Report Share Posted October 14, 2014 i didnt touch anything in the bottom end... would going from stock to a ported/high compression engine make a difference with vibration? it was very smooth running before the rebuild... i noticed it as soon as i started it up for the first time.....i may just be paranoid? Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted October 14, 2014 Report Share Posted October 14, 2014 who fukn knows how many hours are on that stock bottom end it could be on its last legs, even a fresh stock unwelded yamaha crank will stuggle to survive good porting, it will separate...go out of phase...boom the general rule is once you go past bolt on mods is you sort the bottom end out with a rebuilt trued and welded stock crank or aftermarket i think you might of built a timebomb Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 14, 2014 Report Share Posted October 14, 2014 i didnt touch anything in the bottom end... would going from stock to a ported/high compression engine make a difference with vibration? it was very smooth running before the rebuild... i noticed it as soon as i started it up for the first time.....i may just be paranoid? Sure, that could rattle the crank apart or out of phase if it wasn't pulled apart and welded. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted October 14, 2014 Report Share Posted October 14, 2014 You were told like 10 times in your other thread to pull the crank and have it checked and welded. You already had 19cc domes race gas and +6° timing on that crank. Now you have porting done. Your not gonna baby the bike. Not saying this is your issue, but it's high possibility your gonna be dealing with it relatively soon. Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted October 14, 2014 Report Share Posted October 14, 2014 Maybe going from low compression to such higher is creating more vibes u are not use to? Quote Link to comment Share on other sites More sharing options...
RooR Posted October 14, 2014 Author Report Share Posted October 14, 2014 guys i know that the bottom end needs beefed up but, the crank hasnt twisted yet....its made this vibration since the second i first started it after rebuild....its only been ran at idle so far Quote Link to comment Share on other sites More sharing options...
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