DR650 790 Big Bore Installation and Review

[planemanx15]

I haven't had time to ride, when I was off work, it got way cold and started to snow again... I think I have around 50 miles on this tank. I haven't been riding it too hard, or too soft. Just a normal pace.

[Dalmatino]

Just curious about vibration with the big piston?
DR is one of the smoothest big singles when stock and I hate the thought of loosing that.

[bkoz]

Originally Posted by wvdirtbiker
I would like to see this package of piston, rings and cylinder come with the rings set to the MINIMUM gap that would not cause damage to the engine.

Originally Posted by VooDooDaddy

Christalmighty...!

If you are that much of a novice, then I highly, highly recommend you stay away from the inside of any motor. The ring end-gap is one of the most basic procedures of any engine build.

What's next, disclaimers about cylinder head torque, piston ring spacing, proper cam timing, RPM during new cam break-in, etcetera...?

Wow

Agreed!!

The ring end gap needs to be checked with an OEM piston and rings let alone a big bore upgrade.

If you are unsure about this procedure you should pay a pro to do it.

[Rainier_runner]

[planemanx15]

Originally Posted by Dalmatino

Just curious about vibration with the big piston?
DR is one of the smoothest big singles when stock and I hate the thought of loosing that.

At first, I thought that it vibrated more, but that was because I went from riding my Piaggio which is smooth as silk to the DR. When comparing the two, it doesn't seem to vibrate more then it used to. Vibration was a big concern to me as well, and it worked out great.

[davesupreme]

Originally Posted by bkoz

Agreed!!

The ring end gap needs to be checked with an OEM piston and rings let alone a big bore upgrade.

If you are unsure about this procedure you should pay a pro to do it.

after seeing all this, i think these dorks are trollin' just to get a rise....

[MADurstewitz]

Originally Posted by planemanx15

At first, I thought that it vibrated more, but that was because I went from riding my Piaggio which is smooth as silk to the DR. When comparing the two, it doesn't seem to vibrate more then it used to. Vibration was a big concern to me as well, and it worked out great.

Mine was noticeably smoother. By a lot.

[Foot dragger]

Originally Posted by planemanx15

Not related to the build, but I was able to plasti dip my tank matte gray to try and match my plastics.. It's not too close, but better then black. I might do all the plastics in this color.



Plastic dip claims its chemical resistant, Ill see how it holds up to fumes.

Ive never seen any sealer applied to a plastic tank that didnt bubble up,the plastic is infused with gas fumes and they perk slowly through it,best of luck.

[planemanx15]

I did another oil change today. I think there is about 180 miles on this oil. It came out clean, with minimal flakes. The filter was really clean too. I didn't take any pictures of it, but it was noticeable clean.

Ill probably let this next oil change go for a while. The dr790 is alive and well!!

[procycle]

Originally Posted by planemanx15

Ill probably let this next oil change go for a while. The dr790 is alive and well!!

[vicster]

Thanks for taking the time to share this.
Any MPG figures yet?

[planemanx15]

Not yet I'm only about 120 miles on the tank

[planemanx15]

Forgot to mention, I took my girlfriend out today. She loves the new set up. To paraphrase her words "the bike doesn't feel like its struggling when we are on the highway, and it just glides when we are accelerating. It feels much smoother, and doesn't vibrate nearly as much. I really like it, and can't wait to do a trip" I never thought I would hear those words from her mouth without me persuading her lol

We actually got home and she was bummed out and wanted to go out some more... I can tell this is going to be fun...

[Carbster]

Im getting ready to install my 790 kit, pending my piston coating and a quick dyno run and tune prior to the mod. Once a goodbaseline has been done, I will start the build.

Those fog lights look strangely familiar, SBLEDs? I added a set with a PC Hid. The Led lights are unreal in the shop. I cant wait to get it off the lift and on a dark road! Night riding on the DR was off limits for a while. It was like riding a looking through a key hole at night!

Im hoping my mpg doesnt force me to buy a 747 gas tank. the fcr carb didnt hurt too much but im a solid 45-50 now and frankly I could run it leaner I bet.
Dyno sniffer will tell me all I need to know!

[planemanx15]

Originally Posted by Carbster

Im getting ready to install my 790 kit, pending my piston coating and a quick dyno run and tune prior to the mod. Once a goodbaseline has been done, I will start the build.

Those fog lights look strangely familiar, SBLEDs? I added a set with a PC Hid. The Led lights are unreal in the shop. I cant wait to get it off the lift and on a dark road! Night riding on the DR was off limits for a while. It was like riding a looking through a key hole at night!

Im hoping my mpg doesnt force me to buy a 747 gas tank. the fcr carb didnt hurt too much but im a solid 45-50 now and frankly I could run it leaner I bet.
Dyno sniffer will tell me all I need to know!

Those lights are basically cheap walmart housings, that came with bulbs. I think they were MR-16 bulbs. Then I went online and bought those bulbs in LED format. They are great. lots of lighting on the side, and the HID goes solid down the road.

With the upside-down triangle I got going, it catches a lot of peoples attention...which as we all know is a good thing. I ride with them on day and night.