problems

[Screwy]

As subject , Took the bike up to Croft today and i have a problem . The bike will run fine for 30 or so miles then die so pull in turn of the ignition wait a couple of minutes then start the bike ,everything is fine , 30 miles or so later repeat . It appears to be fuel starvation so i,m thinking fuel pump or filter ?

Thanks in advance for any input





Paul

[antonye]

Sounds like a build up of pressure stopping the fuel from getting through - a blocked breather pipe or incorrectly fitted breather valvue (ie, wrong way round!) would do this.

[chicken]

sounds like a familiar problem.

First thing to check is that the tubes under the tank are not being pinched at any point as this happens really easily when lowering the tank.

If this doesn't help then I am stumped.

[Iconic944ss]

Yep - the guys have the popular ones already....

Fuel breather on top of the tank near the yokes - try pulling the tube off the tank (providing its NOT full 'to the brim') if your starvation next happens.

Fuel pipes under the tank - easily trapped + check fuel tap is fully open.

Fuel lines could possibly get blocked up as well but, unlikely.

Sadly, then its into checking filters next I think - which means going into the fuel tank (2 filters in there - one for the pump the other a larger cartridge type).

Followed by delving into the carbs themselves :(

I've had this happen to me and thankfully it was just the tank breather that I replaced via Ducati Leeds who are cool dudes.

Good luck - Frank

[antonye]

I replaced the inner tank filters on the SS tank as part of the strip-down for racing.

It's actually quite an easy job to do - at least I managed to do it!

There are indeed two filters - one is a guaze filter which lays in the bottom of the tank, before the pump, and the other is a standard Ducatui cartridge type after the pump. Really easy to replace both of these and parts should be around £20. I got mine from Nelly at Cornerspeed as he had them in stock along with a new petrol tap (I broke it!) and a sealing ring for the outer petrol cap ring.

[andys 900ss]

Sounds like a trip to Nellys to me, he'll sort it

andy

[Screwy]

Please feel free to mock me severely :o

After reading antonye,s reply I had a classic Doh!!! moment , ofcourse it was a pressure problem cant for the life of me think why i was over complicating things :puzzled:

Sure enough went out , pulled the breatherpipe off and was greeted by a rush of air into the tank , a quick blow through the breather valve confirmed its on back to front . Have'nt a clue how long its been like that , looking at the service history its last MOT was july last year and the previous owner only managed to amass 72 miles from then until november when it was SORN,ed so its anyone,s guess .

Thanks a lot guys been a great help :cool:




Paul

[Screwy]

Just a quick update , Finally managed to get a semi decent run in today (80 miles or so) and everything is fine , the bike didnt miss a beat . Just need to balance the carbs now as they are way out of synch .


Paul

[Iconic944ss]

Balance is easy enough to do - I bought some Mercury gauges years ago and they still serve me well.

I think its recommended to sort everything else from a service point of view BEFORE doing the carbs.... eg - tappets, timing, plugs etc etc.

Happy days - Frank

[Screwy]

Everything done today and carb,s balanced (they where way out of synch) Its transformed the bike totally , its now a joy to ride :cool: I used Morgan carbtune gauges , the ones with a steel rod in the tubes not Mercury (seems mercury manometers are a no no these days) and though i was sceptical at first they worked fine .

Frank your right it is easy enough to do just damned fiddly trying to get to the synchronising screw ;)

[Iconic944ss]

Glad it worked out easy enough for you.

I have the Morgan Carbtune as well that I bought for a BMW about 12 years ago (OMG !!!) I think you'll find it is actually a mercury column in the unit, just found his website.....

http://www.carbtune.com/index.html

As long as they remain 'sealed' I think they are perfectly safe, unless you really want to be 'mad as a hatter' !!!

He also sells a nice long tool :rolleye: for adjusting the carbs but I used a simple screwdriver kit that has a plug-in flexible extention (whole kit bought from Argos for about £10 I think) - did the job a treat.

Sadly I seem to remember the best I could do was to get the sync within about a 5mm of each other - the poor bike was getting far too sweaty and hot otherwise.

I also lost one of the carb adapters that the hose fits on so I got the workshops at my old company to drill two Allen headed bolts for me (4mm?) and these work a treat.

If I every get my 900ss on the road again maybe we could meet up and compare notes as I've never rode a SL and would love to ride one back to back with mine.....944cc kit, drilled airbox, K+N filter, Stg2 Dynojet....blah, blah, blah :lol::lol::lol:

[Edited on 25-4-2005 by Iconic944ss]

[Screwy]

I,d be up for that Frank ;) mines roughly the same spec as yours less the 944 kit as far as i can tell , though it does have 944 decals and i,m sorely tempted to whip the heads of and measure up as the previous owner didnt seem to sure , though the log book does say 904cc and i cant find anything in the service history suggesting a bigbore kit being fitted .

[Iconic944ss]

I vaguely remember there should be some way to tell by looking at the Barrels but I'm darned if I can remember!

Frank