Indiana 650 / Pantah 500

750TT · **Posted:** Fri Jul 17, 2020 2:57 pm

Hi.
I have got a 650 Indiana engine and I want to put two original pantah 500 cylinder heads to convert it to rear intake. What result can I get in engine performance with that combination?

618F1 · **Joined:** Thu Oct 14, 2010 11:23 am **Posts:** 1811

Hello to the islands 750.

The only thing I can think that would effect performance is a teeny-tiny bump in compression because the chambers on the 500 heads are a bit smaller. Valve sizes are the same in both versions, and it may be that the ports on the 650 heads are a little bit larger —- easily fixed. They both used 36mm carbs. The stock cams in both have very close specs. I seriously doubt that you would feel any difference. But they would look right!

I hope someone posts after me; I am sick of seeing my moniker here.

MikeV

PS after 750 sent photos: Send that engine to Lou; he would love to spit shin it!

750TT · **Posted:** Sat Jul 18, 2020 2:23 pm

Hello to Pacific Ocean.
I knew I could count with you

Do not complain, if you know you must share. :mrgreen:

Greetings from a distance.

ducadini · **Joined:** Wed Sep 11, 2013 7:13 am **Posts:** 268

Please tell me how that works out, I've got the same engines and parts here. Just couldn't decide (yet) what to do with them.

ciao
ducadini

750TT · **Posted:** Sun Jul 19, 2020 6:04 am

ok, it will still take some time. But I will put the result here. It is so expensive to find a rear cylinder head, which was the solution, for the old cylinder heads of 500, stored years ago.

CrankyRoller · **Posted:** Sun Jul 19, 2020 9:05 am

I believe the Indiana shares the same transmission as the old Elefant 650 with wide ratios (first is good for hill climbing).
You might consider switching over to pantah gears.
-Cranky-

750TT · **Posted:** Sun Jul 19, 2020 9:15 am

CrankyRoller wrote:

I believe the Indiana shares the same transmission as the old Elefant 650 with wide ratios (first is good for hill climbing).
-

Great, here I can exploit that advantage :mrgreen:

e.ducati.on · **Joined:** Fri Dec 16, 2016 4:25 pm **Posts:** 20

Will the 500 heads drop right on to 650 cases? Stud pattern is the same? I’m wondering about a picture of an Arrmacchi 350 with what appears to be a Pantah top end installed but the 650 Pantah studs are further apart side-to-side than the Aermacchi studs. Thought it might be a 500 top end.

750TT · **Posted:** Tue Jul 21, 2020 3:18 pm

e.ducati.on wrote:

Will the 500 heads drop right on to 650 cases? Stud pattern is the same? I’m wondering about a picture of an Arrmacchi 350 with what appears to be a Pantah top end installed but the 650 Pantah studs are further apart side-to-side than the Aermacchi studs. Thought it might be a 500 top end.

350,400,500,600 , 650 and 750 have the same bolt distance

Indiana 650 / Pantah 500

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