Strange SOBoxer behaviour
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From: Steve H on 23 Jun 2010 16:33 This one could be a potential headache for me. Rode the R100RT into the office today, and got caught up in some really crappy traffic. I filtered as much as I could, but the R with panniers is a tad wide so progress was slow. The engine got hot. Very hot. As in, cooking your feet hot. As I neared the office, the bike started to splutter and stall when coming to a halt. Seemed to happen when revs dropped under 2000 rpm. I put this down to problems with evaporating fuel, parked up and thought nothing of it. But on returning to the bike a few hours later, I still had the same issues, so had to work my way out of London holding the revs at 2000 rpm whenever I stopped. After a run on the M4, giving it some revs, it will just about idle, and revving the nuts off it appeared to almost clear the problem in the hotel car park. Tomorrow I have to ride it from M4 J4 to Southall and back, then on Friday from M4J4 to Hayes and then home in the evening. Everything seems fine once I'm rolling, and, as I said, it appeared to be getting better. Any suggestions? My thoughts are that it appears to be running rich, and has sooted up the plugs? What's the odds of it coming to an expensive, oily death half way home? -- Steve H
From: crn on 23 Jun 2010 16:57 Steve H <italiancar(a)gmail.com> wrote: > > Any suggestions? My thoughts are that it appears to be running rich, and > has sooted up the plugs? > > What's the odds of it coming to an expensive, oily death half way home? Pull the plugs and take a look at the colour. Overheating is more often associated with running weak than rich, a weak mixture is more likely to lead to expensive failures. -- 03 GS500K2 76 Honda 400/4 project 78 Honda 400/4 in black 06 Sukida SK50QT (Slanty eyed shopping trolley)
From: Steve H on 23 Jun 2010 17:04 <crn(a)NOSPAM.netunix.com> wrote: > Steve H <italiancar(a)gmail.com> wrote: >> >> Any suggestions? My thoughts are that it appears to be running rich, > > and >> has sooted up the plugs? >> >> What's the odds of it coming to an expensive, oily death half way > > home? > > Pull the plugs and take a look at the colour. > Overheating is more often associated with running weak than rich, a > weak > mixture is more likely to lead to expensive failures. It pops and bangs on a trailing throttle at the moment, which is why I suspect right, not poor. Thinking about it, it has been backfiring a tad on trailing throttle for a while now. -- Steve H
From: The Older Gentleman on 23 Jun 2010 17:14 Steve H <italiancar(a)gmail.com> wrote: > This one could be a potential headache for me. > > Rode the R100RT into the office today, and got caught up in some really > crappy traffic. I filtered as much as I could, but the R with panniers > is a tad wide so progress was slow. > > The engine got hot. Very hot. As in, cooking your feet hot. > > As I neared the office, the bike started to splutter and stall when > coming to a halt. Seemed to happen when revs dropped under 2000 rpm. > > I put this down to problems with evaporating fuel, parked up and thought > nothing of it. > > But on returning to the bike a few hours later, I still had the same > issues, so had to work my way out of London holding the revs at 2000 rpm > whenever I stopped. > > After a run on the M4, giving it some revs, it will just about idle, and > revving the nuts off it appeared to almost clear the problem in the > hotel car park. > > Tomorrow I have to ride it from M4 J4 to Southall and back, then on > Friday from M4J4 to Hayes and then home in the evening. > > Everything seems fine once I'm rolling, and, as I said, it appeared to > be getting better. > > Any suggestions? My thoughts are that it appears to be running rich, and > has sooted up the plugs? > > What's the odds of it coming to an expensive, oily death half way home? It does sound like it's running lean. Do a plug chop, at varying speeds, to see whether it's needle settings or main jets. Two other possibilities: what oil grade are you running? Try a 10/50 or a 5/50. Secondly, It does have an oil cooler, right? -- BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple Suzuki TS250ER GN250 Damn, back to six bikes! Try Googling before asking a damn silly question. chateau dot murray at idnet dot com
From: Timo on 23 Jun 2010 17:19
On Jun 23, 2:04 pm, Steve H <italian...(a)gmail.com> wrote: > <c...(a)NOSPAM.netunix.com> wrote: > > Steve H <italian...(a)gmail.com> wrote: > > >> Any suggestions? My thoughts are that it appears to be running rich, > > > and > >> has sooted up the plugs? > > >> What's the odds of it coming to an expensive, oily death half way > > > home? > > > Pull the plugs and take a look at the colour. > > Overheating is more often associated with running weak than rich, a > > weak > > mixture is more likely to lead to expensive failures. > > It pops and bangs on a trailing throttle at the moment, which is why I > suspect right, not poor. > > Thinking about it, it has been backfiring a tad on trailing throttle for > a while now. I'd check for air leaks, too. And pull the carb bowls and check for gunk in them. |