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2004 900 Snatches When You Open Throttle Help Appreciated

Started by Bikertone7 , Feb 28 2013 08:56 pm

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#1 Bikertone7

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Posted 28 February 2013 - 08:56 pm

Only had 850 carb models before but finally got an injected 900 last November but only just started to ride it as weather been crap up here in Cumbria. Anyway when I shut off then open it up again at lowish speed the bike jerks forward quite dramatically. Nearly threw me off and feels like it could snap the chain!! Could it be the injectors?? As I said no prev experience of them so info appreciated. Cheers


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#2 TDMTAM

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Posted 28 February 2013 - 09:31 pm

They can be a bit like that. I have fitted a Dobeck TFI unit, after reading other having good results, that makes the world of a difference. The other way could be to install a resistor inline with the O2 sensor to richen the mixture up a little to smooth the throttle response.

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#3 SteveK

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Posted 28 February 2013 - 09:47 pm

Start with a throttle body balance. Can make a difference.
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#4 TDMTAM

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Posted 28 February 2013 - 10:05 pm

Start with a throttle body balance. Can make a difference.

Sorry I was assuming that the basic stuff like that had been checked.

TAM


2008 TDM 900 in BLACK, MRA Vario, DL handguards & more to come
1994 TDM 850 mkI Silver, with Blueflame end can, Gone to a new owner & I kinda miss her!

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Only a Biker knows why a Dog sticks it head out the car window

#5 Bikertone7

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Posted 28 February 2013 - 10:23 pm

Thanks for comments lads. I'll start with the throttle slides. Its definitely not running as smooth as I would have expected and certainly not as well as my previous 850's. Cheers


Other bikes: 1968 Triumph TR6 650cc, 1991 Honda Transalp 600 (everyday runabout), 2013 Triumph Tiger 800 Road, 1979 Kawasaki KL250 green laner (Winter Project)

#6 Trotski

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Posted 28 February 2013 - 10:24 pm

check your chain adjustment too, and try to be more gentle while twisting the wrist, I find a bit of finesse with the clutch and throttle goes a long way in controlling snatchiness  


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#7 leehenty

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Posted 28 February 2013 - 10:57 pm

when doing the throttle bodies aim for the highest vacuum in both, this seems to work. be sure not to overtighten chain, 50-60mm is the amount of slack needed.


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#8 AzzA

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Posted 01 March 2013 - 08:47 am

All of the above... make sure it can run as OEM (Yamaha) intended, and then (if you're still not happy) the Dobeck/Techlusion TFI-1025 with the O2 sensor removed/bypassed... you can tame the TDM900 into a very well behaved machine. AND, It's well worth it.


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#9 OldGit

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Posted 01 March 2013 - 01:57 pm

+1 for the Dobeck. Oh and loud pipes as well :groucho:


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#10 TDMick

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Posted 01 March 2013 - 02:04 pm

Has the airbox mod been done?


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#11 JBX

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Posted 01 March 2013 - 02:51 pm

Also check throttle cable free play or (with your physician) that you don't have the Parkinson's disease. :lol:

 

Jerkiness can be fixed very easily within minutes and without expense.


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#12 Dougie69

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Posted 01 March 2013 - 03:56 pm

+2 for dobeck and loud pipes makes a great deal of difference to the bike

#13 TKH

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Posted 01 March 2013 - 04:05 pm

Can also be worth upping the CO a few points on each side.


#14 Bikertone7

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Posted 01 March 2013 - 04:27 pm

Replies much appreciated I'll start with the bodies. Not used to so much electronics my other bikes are a 68 Bonneville and a 52 Matchless!! (not forgetting my Transalp!!) Cheers


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