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mjb-is |
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mjb-is L Plate Warrior
Joined: 22 Feb 2021 Karma :
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 11:12 - 22 Feb 2021 Post subject: Re: Honda VFR750 Running Problem |
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mjb-is wrote: | Hi, first post so be gentle.
I have a VFR750F 1991 that I have owned for over 20 years now and I am experiencing some running issues.
Carbs have all been cleaned out and a few refurb jobs done to get through MoT and back usable ready for the summer.
However, the bike seems hard to start and runs 'lumpy'. Choke doesn't seem to help, in fact it hinders starting and seems to start better with no choke and a little turn on the idle adjuster on the left hand side, then backing it back off once warmed up.
After a while it will start to run better as it warms up, but it always used to start easily and on choke normally as you'd expect. It almost sounds like it is running on just 2 or 3 cylinders to start.
I just wondered if anyone has any pointers as I don't have a lot of experience with carbs, usually working on fuel injected cars.
Worst case scenario I will get it into a local bike shop and let them give it a good look over. |
Robby from here would know more (he bought my VFR and resolved the issues) but I had a similar problem and it turned out to be the fuel pump breaking down.
I believe you can rebuild them, but they aren't expensive to replace. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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jaffa90 |
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jaffa90 World Chat Champion
Joined: 06 Apr 2016 Karma :
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Robby |
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Robby Dirty Old Man
Joined: 16 May 2002 Karma :
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mjb-is |
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mjb-is L Plate Warrior
Joined: 22 Feb 2021 Karma :
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mjb-is |
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mjb-is L Plate Warrior
Joined: 22 Feb 2021 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 18:26 - 22 Feb 2021 Post subject: |
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Fuel pump points could be getting sketchy by now. The one on my '91 VFR just let go at the end of last year, fitted a facet one instead.
Did you change the sparkplugs while you had it all apart?
If it was running ok before the carbs were serviced and now isn't, you'd have to be suspicious.
If you get a really long screwdriver, you should be able to open the carb drain screws. Make sure they are all filling.
Is the choke mechanism working properly. You haven't trapped a cable or got it back on wrong?
When you look in through the top of the airbox, are all the butterflys resting in the same position and all moving properly when you open the throttle? ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Robby |
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Robby Dirty Old Man
Joined: 16 May 2002 Karma :
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Old Thread Alert!
The last post was made 3 years, 35 days ago. Instead of replying here, would creating a new thread be more useful? |
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