Just some info.
The four stroke will definitely empty your wallet much faster than a two stroke. If you compare a basic rebuild of a 2004 YFZ vs. a 2004 Blaster you'll see what I mean. I used Wiseco list pricing for both builds. I'm sure you can find these parts cheaper if you look. Both engines will have the top ends, connecting rods, gaskets and main bearings replaced.
YFZ
Piston = $188
Top end gaskets = $97
Bottom end gaskets = $73
Rod Kit = $141
Main Bearings = $ 80
Total = $579
Blaster
Piston = $112
Gaskets = $44
Mains and seals = $44
Top end bearing = $16
Rod Kit = $91
Total = $307
The Blaster is about $270 less for the parts. Not that big of a deal. Because the engines are so different, other factors will need to be considered. The 2004 YFZ engine is seven years old and the head will require disassembly and inspection. Valve seals came in your gasket kit and need to be installed. This will cost you nothing as long as you have a valve spring compressor. A seven year old YFZ engine will reveal a few surprises upon inspection. The valve spring tester reveals a 30% loss in tension and the faces of all five valves are pitted. Wiseco titanium valves will run you $130 each. That's $650 and an aftermarket spring and retainer kit will run $230. You can save a bunch of loot if you use OEM parts. Five valves and springs will only cost $375. This brings the total of the parts on our YFZ build to $954. More than three times as much as the Blaster parts.
Considering you have all of the special tools and equipment required to assemble the crank, cut valve seats, and assemble the engines, you're done. What if you need to pay for the labor? Here's where things start to come to light. I'll use labor rates from another shop.
YFZ
Valve Job = $180
Split and reassemble bottom end = $475
Reassemble top end = $250
rebuild crankshaft = $75
Total Labor = $980
Blaster
Bore cylinder = $55
Split and assemble bottom end = $175
Assemble top end = $75
Rebuild crankshaft = $75
Total = $380
The YFZ engine is once again almost three times the price. Here's the comparison for each engine.
YFZ rebuild with OEM valve components = $1934
YFZ with aftermarket valve components = $2439
Blaster rebuild = $687
Other things to consider:
The YFZ cylinder head costs $800 - $1000 new and $300 - $500 used.
The YFZ has cams that cost about $200 each new.
You cant bore the YFZ. Plating will run you $130 - $180.
Valve shims run $7 @.
A total melt down of the YFZ engine has the potential of relieving your bank account of $3000 - $4000. Look before you leap.
The four stroke will definitely empty your wallet much faster than a two stroke. If you compare a basic rebuild of a 2004 YFZ vs. a 2004 Blaster you'll see what I mean. I used Wiseco list pricing for both builds. I'm sure you can find these parts cheaper if you look. Both engines will have the top ends, connecting rods, gaskets and main bearings replaced.
YFZ
Piston = $188
Top end gaskets = $97
Bottom end gaskets = $73
Rod Kit = $141
Main Bearings = $ 80
Total = $579
Blaster
Piston = $112
Gaskets = $44
Mains and seals = $44
Top end bearing = $16
Rod Kit = $91
Total = $307
The Blaster is about $270 less for the parts. Not that big of a deal. Because the engines are so different, other factors will need to be considered. The 2004 YFZ engine is seven years old and the head will require disassembly and inspection. Valve seals came in your gasket kit and need to be installed. This will cost you nothing as long as you have a valve spring compressor. A seven year old YFZ engine will reveal a few surprises upon inspection. The valve spring tester reveals a 30% loss in tension and the faces of all five valves are pitted. Wiseco titanium valves will run you $130 each. That's $650 and an aftermarket spring and retainer kit will run $230. You can save a bunch of loot if you use OEM parts. Five valves and springs will only cost $375. This brings the total of the parts on our YFZ build to $954. More than three times as much as the Blaster parts.
Considering you have all of the special tools and equipment required to assemble the crank, cut valve seats, and assemble the engines, you're done. What if you need to pay for the labor? Here's where things start to come to light. I'll use labor rates from another shop.
YFZ
Valve Job = $180
Split and reassemble bottom end = $475
Reassemble top end = $250
rebuild crankshaft = $75
Total Labor = $980
Blaster
Bore cylinder = $55
Split and assemble bottom end = $175
Assemble top end = $75
Rebuild crankshaft = $75
Total = $380
The YFZ engine is once again almost three times the price. Here's the comparison for each engine.
YFZ rebuild with OEM valve components = $1934
YFZ with aftermarket valve components = $2439
Blaster rebuild = $687
Other things to consider:
The YFZ cylinder head costs $800 - $1000 new and $300 - $500 used.
The YFZ has cams that cost about $200 each new.
You cant bore the YFZ. Plating will run you $130 - $180.
Valve shims run $7 @.
A total melt down of the YFZ engine has the potential of relieving your bank account of $3000 - $4000. Look before you leap.
your results may and will vary I:I
