Mal
Tuned and Synch'ed
- Joined
- Apr 27, 2010
- Messages
- 91
Hi Guzzitech’ers
We brought a 2004 Breva 750ie for my partner (goes with the 1200 Sport in my avatar ) a week before a trip from Townsville to Agnes Water. We rode down over 2 days along the coast ~900km spent 2 weeks there and rode home inland also over 2 days ~1,100km.
The bikes performed really well but now when riding in town at 60~80km/h the 750 Breva seems to run a bit rough on constant throttle. Now she is new for us so it’s hard to notice a “change” as such but the rough running / surging is definitely noticeable but not unrideable. No surging was apparent while riding around on the week before the trip or during the 2 weeks while in Agnes Water. Also seems smooth at 100km/h just surging / rough in the 60 and 80km/h zones.
Possibilities
On the last day of the trip back we had to fill from reserve with normal unleaded (91 RON?) petrol, only fuel available for 200km. Also had to use premium unleaded (95 RON) during the trip when we couldn’t obtain my preferred BP Ultimate (98 RON - My Sport seems to ping under load when not on the 98 RON fuel)
The ride back was usually sustained ~120km/h and up to 30 deg C (not really that hot for North Queensland)
She did stop once when idling on the side of the road and took a few spins to start, also needed a bit of throttle and a few spins when cold to start on the last day. Not really issues but perhaps worth mentioning.
I’m thinking bad fuel, or perhaps some water in the fuel. My Sport is running fine but has a bigger tank than the Breva so I didn’t totally fill her tank except when I could get the 98 RON fuel. I was going to run the Breva to almost empty and then refill, but my partner just filled her when the reserve light came on (5 litres remaining)
There was some black specks when looking in the tank with a light, could be some “junk” in there that might have got shook loose on the rough roads.
The bike did sit in the Honda shop for sale for many many months (we got a good price) and the engine oil didn’t look real healthy when I changed it for the trip (It was at 27,000km so probably getting close to needing a service) Didn’t look at clutch and gearbox oil but I note the instruction manual has 80W90 handwritten for both of these. It was probably serviced at the local Honda shop, which sold Guzzi for a few years. They put the wrong viscosity engine oil in my sport, she was their last Guzzi demo bike, so they probably just used 80W90 as “close enough”. Guzzitech recommends the 85W-140 as important in the small block Guzzi rear transmission. I’m not mechanical myself so I’m not sure how important that is.
Really remote possibilities
Clutch on the Breva seems noisy when pulled in and idling stationary, but bike is really too new to be sure if that sound changed at all.
Spark plug caps very slightly loose but wiggling them while riding doesn’t make any difference so unlikely.
Also has a powercomander installed (unlikely to have “changed” unless there are buttons on it the could have rattled I’m not familiar with power comanders)
So after that loooooooong post any recommendations?
Thinking run a tank of fuel injection cleaner? If no luck I do have a good mechanic that looks after my Sport and the Breva will have to go for a service soon so get him to replace fuel filters etc. I can also look at downloading a powercomander map.
Thanks in advance.
We brought a 2004 Breva 750ie for my partner (goes with the 1200 Sport in my avatar ) a week before a trip from Townsville to Agnes Water. We rode down over 2 days along the coast ~900km spent 2 weeks there and rode home inland also over 2 days ~1,100km.
The bikes performed really well but now when riding in town at 60~80km/h the 750 Breva seems to run a bit rough on constant throttle. Now she is new for us so it’s hard to notice a “change” as such but the rough running / surging is definitely noticeable but not unrideable. No surging was apparent while riding around on the week before the trip or during the 2 weeks while in Agnes Water. Also seems smooth at 100km/h just surging / rough in the 60 and 80km/h zones.
Possibilities
On the last day of the trip back we had to fill from reserve with normal unleaded (91 RON?) petrol, only fuel available for 200km. Also had to use premium unleaded (95 RON) during the trip when we couldn’t obtain my preferred BP Ultimate (98 RON - My Sport seems to ping under load when not on the 98 RON fuel)
The ride back was usually sustained ~120km/h and up to 30 deg C (not really that hot for North Queensland)
She did stop once when idling on the side of the road and took a few spins to start, also needed a bit of throttle and a few spins when cold to start on the last day. Not really issues but perhaps worth mentioning.
I’m thinking bad fuel, or perhaps some water in the fuel. My Sport is running fine but has a bigger tank than the Breva so I didn’t totally fill her tank except when I could get the 98 RON fuel. I was going to run the Breva to almost empty and then refill, but my partner just filled her when the reserve light came on (5 litres remaining)
There was some black specks when looking in the tank with a light, could be some “junk” in there that might have got shook loose on the rough roads.
The bike did sit in the Honda shop for sale for many many months (we got a good price) and the engine oil didn’t look real healthy when I changed it for the trip (It was at 27,000km so probably getting close to needing a service) Didn’t look at clutch and gearbox oil but I note the instruction manual has 80W90 handwritten for both of these. It was probably serviced at the local Honda shop, which sold Guzzi for a few years. They put the wrong viscosity engine oil in my sport, she was their last Guzzi demo bike, so they probably just used 80W90 as “close enough”. Guzzitech recommends the 85W-140 as important in the small block Guzzi rear transmission. I’m not mechanical myself so I’m not sure how important that is.
Really remote possibilities
Clutch on the Breva seems noisy when pulled in and idling stationary, but bike is really too new to be sure if that sound changed at all.
Spark plug caps very slightly loose but wiggling them while riding doesn’t make any difference so unlikely.
Also has a powercomander installed (unlikely to have “changed” unless there are buttons on it the could have rattled I’m not familiar with power comanders)
So after that loooooooong post any recommendations?
Thinking run a tank of fuel injection cleaner? If no luck I do have a good mechanic that looks after my Sport and the Breva will have to go for a service soon so get him to replace fuel filters etc. I can also look at downloading a powercomander map.
Thanks in advance.