whenfoxforks-ruled said:INVEST in the tools! 300 to 400 dollars in parts, complete=1 fresh engine. Older bikes can be a pain, and some you can not get complete crank assemblies. But, Wiseco, Hotrods, and Motosport offer complete engine kits for most popular models. Not that 609 sounds too unreasonable. Crank, bearings and seals, 250? Usually the big end bearing going out takes the head and cylinder with it, and rarely the cases.
whenfoxforks-ruled said:Oh it does give warning signs, if you know how it feels and sounds when it completely goes. Keep track of hours and maintenance schedules=running like new all the time. After its broke in, check the compression, and recheck frequently. A leak down test can show a seal in the bottom end going. The old saying"It ran the best ever, right before it blew" comes true a lot! And its not how it looks, measure it also! I have heard of brand new oem cranks being .010 on the flywheel run out, .002 is max. Check the thrust washer clearance, skirt, bridge and ring gap.
I have seen plenty of seizures from skipping that step, and having enough clearance at the bridge,.0035"~.004". Way too many people doing bore jobs and not relieving the ports and bridges properly. 4 stroke bores are too easy?julien_d said:the reason for the holes is to allow more lubrication to the exhaust bridge.
whenfoxforks-ruled said:I have seen plenty of seizures from skipping that step, and having enough clearance at the bridge,.0035"~.004". Way too many people doing bore jobs and not relieving the ports and bridges properly. 4 stroke bores are too easy?
YEP, not a fan of Vertex, yack gag, not as bad as oem Chinese? Maybe Vertex figured that black coating thats gone it a minute would save it? There are some ports that do not have bridges in the middle. You really need someone with a bore gauge, check all the ports for a bevel on the edge, and the bridge relief. Or, it will happen again. Maybe worse next time.rmrider45 said:the stock piston i took out had no holes!!!!! and vertex never listed in drilling holes in the piston.and this bike was never bored
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?