linda and mark
Just got it firing!
Hi Everyone.
We are new on here and total technophobes, so please excuse us if we do this wrong. We used to ride Guzzis from 1980 until 2004, our first one being a V50 2 and the last one being a Jackal. Then we were out of the country for a while, but we have finally got a Nevada 750. She's a 2016 model that we bought in May and she's a great little bike, but we are having problems with her popping and back firing, mainly at low revs in town traffic.
Fortunately the shop that we bought her from has given us a 2 year warranty, but after taking her back 3 times, nothing has changed. It has been an 80 mile round trip to the shop and as of next week this is increasing to 200 miles as we are moving. So we really want to get it sorted out.
The service department is now claiming that it is something called over run, which we have never heard of. Apparently all bikes with fuel injection systems have the same problem, ie when you shut the throttle off, there is too much fuel being delivered so the bike back fires as it burns this off. Now we know absolutely nothing about fuel injection, but ours would fail the noise restrictions if nothing else. She can rattle windows when she is really bad.
Our jackal had fuel injection and never gave us any trouble at all. Plus we had a V7 3 loan bike the last time we left our Nevada at the shop and that didn't have any problems either. Ours hardly ever causes any trouble at speeds over 40 mph and at 70 mph we can shut the throttle off as hard as we like and she hardly even burbles. But cruising along the flat, going up hill and mostly going down hill, even under load, is virtually guaranteed to get her playing up when in town traffic. This equates to around 30 mph in second or third gears, at 2000-3000 rpm.
Has anyone else heard of this problem before please? We've tried searching Google and came up with the following explanations for cars:
'To minimise waste fuel on the overrun, the fuel pressure regulator reduces the amount of fuel that can pass through the injectors from the usual setting by vacuum control.'
'On deceleration, the throttle butterfly is closed, so vacuum is at its greatest. This vacuum pulls on the fuel pressure regulator and this reduces the fuel pressure by about a sixth. Therefore, in the same time, less fuel enters the engine via the injectors.
It doesn't mean very much to us, but we assume this is the same for bikes?
Thank you in advance for any help you can give us.
Best wishes
Linda and Mark
We are new on here and total technophobes, so please excuse us if we do this wrong. We used to ride Guzzis from 1980 until 2004, our first one being a V50 2 and the last one being a Jackal. Then we were out of the country for a while, but we have finally got a Nevada 750. She's a 2016 model that we bought in May and she's a great little bike, but we are having problems with her popping and back firing, mainly at low revs in town traffic.
Fortunately the shop that we bought her from has given us a 2 year warranty, but after taking her back 3 times, nothing has changed. It has been an 80 mile round trip to the shop and as of next week this is increasing to 200 miles as we are moving. So we really want to get it sorted out.
The service department is now claiming that it is something called over run, which we have never heard of. Apparently all bikes with fuel injection systems have the same problem, ie when you shut the throttle off, there is too much fuel being delivered so the bike back fires as it burns this off. Now we know absolutely nothing about fuel injection, but ours would fail the noise restrictions if nothing else. She can rattle windows when she is really bad.
Our jackal had fuel injection and never gave us any trouble at all. Plus we had a V7 3 loan bike the last time we left our Nevada at the shop and that didn't have any problems either. Ours hardly ever causes any trouble at speeds over 40 mph and at 70 mph we can shut the throttle off as hard as we like and she hardly even burbles. But cruising along the flat, going up hill and mostly going down hill, even under load, is virtually guaranteed to get her playing up when in town traffic. This equates to around 30 mph in second or third gears, at 2000-3000 rpm.
Has anyone else heard of this problem before please? We've tried searching Google and came up with the following explanations for cars:
'To minimise waste fuel on the overrun, the fuel pressure regulator reduces the amount of fuel that can pass through the injectors from the usual setting by vacuum control.'
'On deceleration, the throttle butterfly is closed, so vacuum is at its greatest. This vacuum pulls on the fuel pressure regulator and this reduces the fuel pressure by about a sixth. Therefore, in the same time, less fuel enters the engine via the injectors.
It doesn't mean very much to us, but we assume this is the same for bikes?
Thank you in advance for any help you can give us.
Best wishes
Linda and Mark
