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cold hearted 1100 Sport?

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frozennorth View Drop Down
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    Posted: 10 Dec 2016 at 21:06
I recently resurrected a 1996 1100 Sport, carb. model after a looong hibernation; cleaned out carbs, replaced inlet rubbers, full service inc. filters etcetc.
Sounds healthy, but it seems to take a long time to warm up, and even when hot occasionally spits back, feels like it's really lean, or something not quite right on ignition timing; also feels like it's holding back a bit, if you know what I mean.
It's completely stock, no apparent air leaks or the like, brakes are all free, nothing obvious.
My first Guzzi, so I'm not familiar with the breed though aeons of experience on others: before I start diving in, does this sound familiar to anyone?Confused
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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2016 at 21:15
Sounds like a normal 1100 sport ,standard jetting is on the lean side so you could rejet . Been drinking so will revisit this post
GSXR1100 L ,Moto Guzzi .750xpa,.1100 sport,1100 sport corsa rider
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2016 at 17:06
Hi I had this problem in the winter months and I went from 55 idle jet to 60 I think, I also changed main jet when I had non standard end cans fitted . My bike as run perfect all summer with standard air box  but as soon as the weather changed it still starts on the button but takes a good while until it runs happy .
I am now thinking about putting some heated pads on each carb I think sometimes its like carb icing ,like you say it hold back .
When you get the hang of the sport it is a pure joy to ride


Edited by johnno - 11 Dec 2016 at 17:10
GSXR1100 L ,Moto Guzzi .750xpa,.1100 sport,1100 sport corsa rider
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2016 at 17:12
Until all these Euro compliance things came into being, big block Guzzis were overcooled, taking a long time to warm up in cold weather.
Brian.

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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2016 at 17:48
I used to reckon on 10 miles of actually riding it to get it properly warmed up, never warmed up properly while parked on the stand in the garden. (Big block Tonti)



"Chicken nuggets don't dance on a Tuesday."
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frozennorth View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frozennorth Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 09:51
Mmmm... I can feel some rejetting (at least!) coming on, anyone any ideas re sizes / needles etc, the bike is currently totally stock; and I've not had time to find any info yet, but is there an interaction with the ignition system (vaccum or similar?)
Off to Spain now for a week, brilliant roads there, shame no bike!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 10:42
I've not got that much Guzzi experience but surely a lean mixture makes an engine run hotter?
 
I know from past tuning that most tuners advise to get bike running at optimum power/AFR and then richen slightly to keep it cooler for engine longevity.
 
My LeMans definitely doesn't run too cool in warm weather as oil temp is usually around the 100c mark during a ride (don't ride it in winter) and it definitely fuels on the rich side.
 
Although, I suppose given the design/exposure of the engine to the air, then they may well overcool in cold temperatures especially if it has an oil cooler?...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 12:50
Yes, a lean mixture will get the engine running hotter, but what we are talking about is the amount of cooling fins and the mass of the engine which takes a long time to heat up in cold weather.
Remember a parallel twin or in line multi has all the cylinders next to each other which aids warming up.
 
By comparison, the small block Guzzis warm up much quicker.
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 13:26
Eurocarbs may help with jetting info they are Dellorto specialists ..
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 17:26
First of all check the carbs are clean. Could be the jets are partially blocked - guess how I know!

Trouble is modern petrol leaves hard brown and/or green deposits when it dries out that can wreak havoc on a carb's internals, clogging it up with crud. Even been stories of it building up on the outsides of floats so that they jam on the side walls of the float chamber. For this reason best advised to leave carb's drained dry if a bike is going to be left unused for any length of time.


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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2016 at 19:40
The crud that ethanol fuel leaves is unbelievable it also eats fuel pipe if the hoses feel squidgy replace them If a bike has been sat a while replace the fuel filters if fitted too ....
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 2016 at 16:16
Yes need compatible type fuel hoses too...

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Drumnagorrach Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2016 at 16:18
Have a look at Guzzology ,or someone on here have a look at theirs and post the recommendations for jetting the sport 1100 . I had one years ago and it was under jetted as standard ,the bike was much faster afterwards . I remember changing jets and needles ,I still have the original ones ,not much use .
 I always had problems at low revs and light throttle openings in cold damp weather ,it just spluttered and hesitated untill the revs got up .
 The last ride I remember on it was going home from the Scottish Guzzi rally at Traquare ( that may be spled rong )very cold and wet monday morning ,and it being a bloody nightmare going around the Edinburgh ring road ,once I got clear ,even over Drumochter on the A9 in snow it was fine as long as I kept it going.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frozennorth Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 2016 at 15:55
Thanks for the advice, I don't have a copy of Guzziology but if anyone could help I'd be grateful!
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Post Options Post Options   Thanks (1) Thanks(1)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 2016 at 16:49
standard idle jet 57 ,main jet 152
USA had idle jet 52 ,main jet 152
with standard air box but non standard endcans i think i went 60 idle jet and 160 main jet
i am no expert but this as worked for me in all but freezing conditions
GSXR1100 L ,Moto Guzzi .750xpa,.1100 sport,1100 sport corsa rider
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