Have a look to my suggestions for carb tuning in the 750 F.A.Q. post
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| Nervous Engine below 2500 rmp http://www.ducatipaso.org/forum/viewtopic.php?f=2&t=2608 |
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| Author: | Menno [ Sat Jul 19, 2008 4:18 pm ] |
| Post subject: | Nervous Engine below 2500 rmp |
Hi there, Riding a 906 for a couple of weeks now and I do have a (minor?) problem with it. When riding under the 2500 rmp and when I want to accelerate the engine holds in and starts to backfire a little bit. When opening throttle very, very slowly, there's no problem. It's also a bit non responsive on the throttle after closing it and opening again at higher speeds. When opening more than 1/2 there's now problem at all. Goes like a lunatic! Does it sounds familiar to someone? Is it the Weber or should I search somewhere in the electrics? Best, Menno |
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| Author: | persempre907 [ Sat Jul 19, 2008 8:29 pm ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Welcome Menno, I'd say that less than 2500 rpm are very low for a carbed V twin, so that you can't pretend a smooth acceleration. On my 906 (less on the 907), the bike used to jerk along. No matter, it's really hard the tuning of the Weber... Ciao |
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| Author: | jcslocum [ Mon Jul 21, 2008 8:49 pm ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Menno, Sounds like the carberettor needs to be tuned and the throttles balanced. Riding the engine at this low RPM will also make the engine very "jerky" and it will shake a lot. Keep the revs above 3500 RPM all the time and it will be smoother. |
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| Author: | Mc tool [ Tue Jul 22, 2008 12:24 am ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
I agree with the above comments in that they are a bit poxy at low ish revs , but if you are into "fiddling" I would check the fuel flow from tank to carb ( as a matter of course ) but mostly I'd be interested to confirm that both accelerator pump nozzles are discharging. remove air box , look down throttle bores and open throttle and you should see two squirts of fuel ( one per venturi ). you dont say how old the spark plugs are , or how long since the valves were "done " Ps the accelerator pump test should be done with the motor NOT running. Ha ha ha I just had this mental image of some guy with an eyeball hovering over each venturi ( there about the right distance apart ) tweakin the throttle coz if it decides to spit back , which it will probably do without the air box assy............. the injury ( whilst hysterically funny to any bystanders ), would not be nice , and it is difficult to explain to everyone where all your face hair went Good luck |
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| Author: | ducapaso [ Wed Jul 23, 2008 5:52 am ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Have a look to my suggestions for carb tuning in the 750 F.A.Q. post
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| Author: | JWilliam [ Wed Jul 23, 2008 4:55 pm ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
| Author: | Menno [ Wed Jul 23, 2008 10:24 pm ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Hi Guys, Thanks for the comments so far. Think I will start with the Weber. Allthought it might take a little while because last weekend the cluch broke down. The pressure cilinder (slave) has found a way right through the pressure plate! Completely worn. Ordered some parts; new cilinder and a used pressure plate. Have to fix that first. We have to keep on riding of course.. Keep you posted. Menno |
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| Author: | ducbertus [ Sat Aug 02, 2008 7:42 pm ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Hi Menno, Maybe you check your fuelpressure too. I had a 900SS with weber. No fun. it profed difficult to the card. later I read somewhere that Ducati had "forgotten" to build in a fuel pressure regulator, which probably could have cured my problems at that time. good luck Ducbertus |
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| Author: | jomo [ Mon Aug 04, 2008 11:03 am ] |
| Post subject: | Re: Nervous Engine below 2500 rmp |
Start with new spark plugs and work from there. Cheap things first! |
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