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General Category >> Rubber Side Down! >> 95,96 or 97???
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Message started by Jweintraub on 09/25/15 at 15:16:12

Title: 95,96 or 97???
Post by Jweintraub on 09/25/15 at 15:16:12

Was wondering if anyone can help me on which way to go with this overbore. I would like to know which size people have the best luck with and could someone point me where to start with my re jet? Thanks so much guys

Title: Re: 95,96 or 97???
Post by Kris01 on 09/25/15 at 16:43:15

Are all 3 sizes still available? Where are you sourcing parts?

Title: Re: 95,96 or 97???
Post by Jweintraub on 09/25/15 at 17:21:38

Ebay piston kits new with rings piston clips and wristpin 96mm is only 120 shipped 95 and 97 are a bit more like 140

Title: Re: 95,96 or 97???
Post by Jweintraub on 09/25/15 at 17:22:18

Look up piston kit dr650 1990-1995

Title: Re: 95,96 or 97???
Post by Dave on 09/25/15 at 17:50:11

I went with the 95mm on my build, and I added a Stage 1 cam and did some clean up work on the cylinder head ports. I went with the 95mm as my riding is mostly back roads in 3-4 gear, and at speeds around 45mph....and I wanted to be somewhat gentle on the clutch and belt drive. The engine runs really well, gets good mileage and has a noticeable power increase over stock. It ran fine with the stock carb and air cleaner, and a DYNA muffler.

According to this computer...the HP increase based on the stock 30 HP, stock 8.5/1 compression ration and increase to 10.5/1 compression is only 2 HP. I sure think it feels like a bigger increase.

http://www.bgsoflex.com/cgi-bin/crchange.cgi?hp=30&oldcr=8.5&newcr=10.5

Going from 95mm to 96mm adds another couple of HP and some torque, and the change to the 97mm adds a couple more HP and more torque.

If you are going to make the change to a piston....you really should do the cam as well. It will bump the HP up considerably.

Next time...I most likely will try the 97mm just for kicks! ;)

Title: Re: 95,96 or 97???
Post by justin_o_guy2 on 09/25/15 at 17:54:30

Have you had a machinist look at the jug and tell you what it's gonna take to clean up?
There's a silicone carbide treatment that helps,
I Think that's the name,,
You're gonna be inside, might be a good time for a cam.