#11
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This great! Thanks for all the details and pics!
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#12
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No worries. More to follow.
Todays activites included removal of the power valve. Port matching and cleaning of the exhaust port to manifold and cleaning up the casting flaws in the transfers. Then a good clean and deglazing of the cylinder. Happy days. |
#13
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Parts on the ready (seals and gaskets, pistons and little end)
Quick pic of the head Removed the powervalve |
#14
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Port matching the exhuast to the spigot
Stock there was several mm of excess lip where the exhaust and spigot didn't match up. Remembered to snap a shot just after I started work.
After some work things started to take shape And near enough, is good enough |
#15
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Stock transfers didn't look too bad. Few small casting defects in places.
And again, after a little touch up. I'd have liked to worked into the ports deeper but access is tight with the tooling, and getting too close to the coating isn't a great idea. |
#16
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And last shots for the day. Couple of the cylinder after a scrub up.
Nice coffee cup Next jobs Clean the power valves Decide which piston to use (A or B) - Leaning towards an A Clean the head Spec up the bottom end The put her back together including fresh crank and countershaft seals. Probably a few days tinkering there. After that the back end can go back together and the forks and head stem will come off for their turn. |
#17
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Nice stuff, thanks for the photos!
__________________
2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300 "If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut." ―Comedian Lewis Black "I think best when I have a wrench in my hands." Soichiro Honda "Dreams are messages from the deep." -Unknown Sardaukar |
#18
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You could probably bring those aux ex port tunnels out to the spigot or even into it as they are shrouded and blow down is important. Don't be tempted to remove any material from the main port tunnel, it already looks too big. Might have a good look when mine is off next month.
__________________
'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#19
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Quote:
I had no desire to increase the size of the main exhaust port any more than required to match the spigot. Some material had to be removed during the process. No intent to make it any bigger. Quick question - how does the relationship between port window (in cylinder) vs port volume influence engine performance? Thats before you start to bring angles into the equation. |
#20
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Great work Jake. I've got a couple bikes that need going through - care to do it for the cost of a plane ticket?
__________________
Steven Beane #275 PlusOnePerformance - Superior Service the World Over - Dearborn MI AMA District 14 (Michigan) Officer afterhourscycle.com Michigan's Beta and TM Race Headquarters |
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