I love my 2005 Monster 620 Dark and have it modded exactly how I want. Really dont think I'd ever sell it but I'd like to get more HP out of it. Especially now that I got the Diavel. The 620 is super fun to ride but I need more power out of it. I was thinking of opening up the airbox and picking up a Power Commander 3 then getting it Dyno Tuned. It's got Boom Tubes so I'm pretty sure there's no stock mapping for those. Not sure how much that would give me in terms of HP. Anyone have any idea?
My other concern is do these type of performance modifications shorten the lifespan of the engine. Thoughts?
Compared to the diavel... Turbo it.
Not gonna get much out of the that engine. Put an 800/900 or 1000 in it.
I was thinking of putting a post 2k 900 in there. Need to find out the fitment for the frame exhaust etc. Hoping 900 Monster engine will fit. I think it will.
The engine fitting the frame will not be a problem, bigger problem will be computer compatibility. 2001 will be a problem, though doable. 2002 up to whenever they went to the stepper motor for idle speed, probably easier.
An 800 is going to be the best bang for the buck, your exhaust will fit, a reflash of your ECU to 800 DP spec and you'll be set.
Quote from: Speeddog on October 30, 2014, 10:32:29 PM
An 800 is going to be the best bang for the buck, your exhaust will fit, a reflash of your ECU to 800 DP spec and you'll be set.
Thorn14 went this route so he'd be a good person to ask.
I think you might miss the 620, espec since you already have a Diavel for insane power. I know I miss(ed) my 750. I dunno if it was the shorter stroke or what but it was just "fun" around town and in the back roads in a way my 900 and Jap bikes of the past never were.
Quote from: Rudemouthsky on October 31, 2014, 03:32:35 AM
Thorn14 went this route so he'd be a good person to ask.
I think you might miss the 620, espec since you already have a Diavel for insane power. I know I miss(ed) my 750. I dunno if it was the shorter stroke or what but it was just "fun" around town and in the back roads in a way my 900 and Jap bikes of the past never were.
This is real good insight as I've also been thinking this could happen. The 620 has been bullet proof and is loads of fun to ride. I should probably accept it for what it is. With my luck I'd swap the engine and have nothing but problems.
Quote from: The ModFather on October 31, 2014, 06:02:24 AM
This is real good insight as I've also been thinking this could happen. The 620 has been bullet proof and is loads of fun to ride. I should probably accept it for what it is. With my luck I'd swap the engine and have nothing but problems.
620 is 61.5mm stroke and an 80mm bore.
750 is 61.5mm stroke and an
88mm bore.
Ferracci sells 750 hi-compression pistons for $420.
You'll have to buy either 695, 800 or 2002
only 750 barrels and do an upper-end swap.
You get to keep your original short-stroke small-case motor (I miss mine...) but punch it up quite a bit.
620 heads are good (certainly better than 750 heads), but 800 or 695 heads are better still.
ECU & mapping? You're on your own there...
Another side note: 620 intake and exhaust ports are in the same place which means you get to keep your Boom Tubes w/o modification. 900 swap will need to have minor changes there.
Another fun idea is that 696 motors (796 too) are starting to come available for cheap $ (if you watch long enough) and those have MUCH MUCH MUCH MUCH better cylinder heads.
800 is the largest you can go before exhaust headers change in length as others have pointed out. I love mine, but headers can be had relatively cheap, so just get a 900 or larger if power is what you want. The 800 is difficult to upgrade with less power options than 900/1000's with big bores, and cylinder kits etc.
Quote from: thorn14 on October 31, 2014, 10:12:52 AM
...but headers can be had relatively cheap...
Headers: Yes.
BoomTubes: No.
Quote from: Duck-Stew on October 31, 2014, 11:16:20 AM
BoomTubes: No.
Forgot about those.
Isn't it just adding a small amount of exhaust pipe on the horizontal? Does the vertical need it as well?
Quote from: thorn14 on October 31, 2014, 11:22:37 AM
Forgot about those.
Isn't it just adding a small amount of exhaust pipe on the horizontal? Does the vertical need it as well?
Yep. The Roadracing exhaust I fitted to my 750 needed about 4.5" to fit my 900 and it was no problem.
(http://i1008.photobucket.com/albums/af202/johnnyblaze19761/1410277617_zpsijo8yoo_edit_1410291522464_zps3rcqg0ws.jpg) (http://s1008.photobucket.com/user/johnnyblaze19761/media/1410277617_zpsijo8yoo_edit_1410291522464_zps3rcqg0ws.jpg.html)
i sent this reply to someone on the ducati.net mailing list on a similar theme to the 620 - 800 - 1000 question:
i kind of like the 696. i'm not so big on the 796. the 796 is a bit too
tweeny for me. the 696 isn't powerful enough to lift the front wheel
without a big effort, whereas the 1100 will throw it round willy nilly with
precious little. but the 796 is in between and i find that a bit
frustrating. tempting more easily than delivering.
the 696 is just fun in a slow way. as long as you don't want a fast bike,
it's cool. i've had a couple of slow bikes that are fun to commute on: kr1s
250 and then m600. but i always had another bike at the same time, as you do.
3 bikes don't take up much more room in a garage than 2, get a new Monster 821.
After all, what kind of story would it be if Goldilocks ran into just 2 bears???
Quote from: jduke on November 04, 2014, 01:19:45 PM
3 bikes don't take up much more room in a garage than 2, get a new Monster 821.
After all, what kind of story would it be if Goldilocks ran into just 2 bears???
You're gonna fit in well here. [evil]
I'm all for 3 bikes but the 2015 Diavel spend makes an 821 unrealistic at the moment and as Monsters go I really do prefer the Aircooled Twins. I'm considering either selling the 620 :'( and buying an S2R 1000 or going for DuckStews suggestion of an Upper End Swap with the Ferraci Pistons on the 620.
Quote from: The ModFather on November 04, 2014, 03:31:56 PM
I'm all for 3 bikes but the 2015 Diavel spend makes an 821 unrealistic at the moment and as Monsters go I really do prefer the Aircooled Twins. I'm considering either selling the 620 :'( and buying an S2R 1000 or going for DuckStews suggestion of an Upper End Swap with the Ferraci Pistons on the 620.
Why do you feel like you need more power from your 620 when you have a Diavel in your garage? I don't understand.
How bout a DS1000 engine swap for the 620, then score an old frame from Pinwall and throw a rat 620 together gradually...that's kinda how I ended up with my "Rat 750", with all the spares I'd accumulated over the years. I still think you'd miss the 620 and having a bike you don't mind thrashing and crashing is nice.
Quote from: Rudemouthsky on November 04, 2014, 04:03:17 PM
Why do you feel like you need more power from your 620 when you have a Diavel in your garage? I don't understand.
Its the Diavel that makes me feel that way. I go back & forth between the two bikes often & the contrast in power makes the 620 seem underpowered. Never felt that way before I had the Diavel. Plus I still like to take the Monster out when riding with other guys and though she handles great & keeps up on twisty roads she gets left behind on the straight-aways.
Get yourself a nice 1050 Speed Triple/end thread.
No thanks. Speed Triple is a great bike to ride (I've put a couple hundred miles on one) but I need a bike I can look at all day lovingly and the Speed Triple doesnt do it for me.
Is an 2002 Monster 900 not a clean engine swap in to a 2005 Monster 620?
Same ecu/exhaust issue. Everything else should swap over fine as far as I know.
900 or DS1000 will get you a dry clutch....