Yamaha IT - Forum

Yamaha IT Models => Yamaha IT => IT 490 => Topic started by: sweede490 on August 05, 2010, 06:06:25 PM



Title: Another IT 490 article
Post by: sweede490 on August 05, 2010, 06:06:25 PM
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00000.jpg)
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00002.jpg)
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00003.jpg)
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00004.jpg)
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00005.jpg)
(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00001.jpg)

 Check out the prices of the parts  :D

                                    Murray
Title: Re: Another IT 490 article
Post by: fatterhatter on August 05, 2010, 07:39:13 PM

 >:(

i like the pictures of the submarine

 ;D
Title: Re: Another IT 490 article
Post by: sweede490 on August 05, 2010, 07:44:08 PM
           Saves washing it i Guess  :D..   Found another

(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00006.jpg)
Title: Re: Another IT 490 article
Post by: scrimsmustang on August 05, 2010, 08:47:41 PM
           Saves washing it i Guess  :D..   Found another

(http://i1002.photobucket.com/albums/af147/langfab/CCF05082010_00006.jpg)

Love the Motofox gear, the jacket is cool... 8)
Title: Re: Another IT 490 article
Post by: Martin I Henry on August 06, 2010, 03:20:10 AM
   Made the topic a ' sticky '

   Thanks for posting that article.

   They make great reading !!

   Piston kit at $48.00, I'll take two !!

   Dave R
Title: Re: Another IT 490 article
Post by: jono793 on November 26, 2010, 03:53:49 PM
Great Article Muzz

If you make over to taupo next weekend can I grab a copy of it please??
Title: Re: Another IT 490 article
Post by: scrimsmustang on November 26, 2010, 09:10:20 PM
36.4 bhp....... :o is that it  ??? my 07 RM125 will kill it.  Im not going to be very let down when i finaly get to ride my 490 am i.
Title: Re: Another IT 490 article
Post by: Uncle Ish on November 26, 2010, 10:53:48 PM
36.4 bhp....... :o is that it  ??? my 07 RM125 will kill it.  Im not going to be very let down when i finaly get to ride my 490 am i.

after riding your 490    :o..... you'll think...holy crap...the HP ratings don't ad up

                                                                                               Ish    :P
Title: Re: Another IT 490 article
Post by: scrimsmustang on November 28, 2010, 04:37:15 AM
I hope so...... ;D
Title: Re: Another IT 490 article
Post by: Martin I Henry on November 28, 2010, 06:19:55 AM
  I have to say when I rode my IT490 a few weeks ago I was very impressed with the power output. Care was needed when riding on the tarmac as the MX tyre would squirm violently under power and the front end became very light in all gears. I would guess from the very short ride I had that 85-90 MPH would be possible with standard gearing.

  Like Mark said the HP ratings don't seem to add up somehow.

  Peak power is not everything, I watched a 1979 ? Suzuki RM125 at the Farliegh Castle twin shock MX come third against a Maico 490 and a YZ490 engined YZ465.

   I am pretty sure that you will have a smile on your face once your 490 is running, and it will turn to a grin when you ride it !

   For peak big bore Yamaha enduro power, the IT425G is tops, as it has just a bit more power up the top end and it comes with quite a rush. The very basic suspension makes it feel more powerful as well ! The IT490 seems a bit more civilised and smooth.


   At the end of the day, I would think that your IT490 will be finished to a very high standard, and will be worth a fortune here in the UK. That has to be good !!


   Dave R
Title: Re: Another IT 490 article
Post by: scrimsmustang on November 28, 2010, 07:58:09 AM
 
  Like Mark said the HP ratings don't seem to add up somehow.

     I am pretty sure that you will have a smile on your face once your 490 is running, and it will turn to a grin when you ride it !
   
   At the end of the day, I would think that your IT490 will be finished to a very high standard, and will be worth a fortune here in the UK. That has to be good !!


   Dave R

Im really looking forward to riding it Dave, i havnt even started to put it back together yet to be honest. I was hopeing it must be a little bit more than the article. I keep reading the 490 described as a tractor and it makes me wonder, im guessing they mean plenty of torque for a 2stroke though.....  ???

Im going to resto it the best i can but i have lots of pattern parts DC sidecovers Renthals etc etc so its never going to be a concours original spec bike.  I have no plans to ever part with it though when its back together, its going in the keeper section with the TDR250  ;D.....  To tell the truth i have no idea what a restored 490 would be worth in the UK. I have seen very few for sale maybe 1 or 2 unrestored bikes on ebay.
Title: Re: Another IT 490 article
Post by: Wyogoose on November 29, 2010, 03:18:50 PM
You hit on the important word and that is torque. The HP ratings could be identical, but what are the torque ratings?? The larger bore, longer stroke and heavier crank add up to a lot more torque. I have no idea what that value would be but as said, it is worth a permagrin for a couple of days ;) ;) I may have access to a dynometer. If it works out I will put the 465J and the 490K on the contraption with a fresh topend on each and see if I can get some readings at 6,500 feet elevation. The closest I have to a little bike is a IT200N and it will be a while before it is together so I may wait until I can test all three at the same time unless an opportunity arises.

Torque is why a typical 200 horsepower diesel engine will pull harder than a 200 horse power  gasoline engine.

I hope this helps
Title: Re: Another IT 490 article
Post by: scrimsmustang on November 30, 2010, 02:41:34 AM
Torque, i hope so as the 07 RM125 puts out a claimed 41bhp but its all topend power.........