Siborg Posted May 14, 2019 Share Posted May 14, 2019 Hi, I've recently seen the light and have bought a 92 vfr 750f It has a couple of niggles I'd like to resolve and I'm sure the knowledge on this forum will be able to help. Ok so when cold bike runs fine, smells a little rich coming from an injected Ducati However once warm it struggles to pull away from a stand still and requires a lot of revs plus sometime when warm it struggles to accelerate past 4k - I experimented by adding choke and it began to run well again. The bike is stock apart from a full FUEL exhaust system and an R1 reg-rec . Additionally, I get the odd backfire pop through the air box. Please help as I really want to put some miles on this bike. Thanks in advance. Link to comment Share on other sites More sharing options...
hondaman219 Posted May 14, 2019 Share Posted May 14, 2019 Sound like carb problems. Quick fix try some seafoam and see if it gets better. Any history on the bike ie sitting for a long time, Old gas, This is a 27 year old bike. I just rebuilt my carbs last week. What a difference. And my bike ran well before. VFR's do not like extras choke..If you can not sort it soon do not keep riding it or you may do damage. Link to comment Share on other sites More sharing options...
squirrelman Posted May 14, 2019 Share Posted May 14, 2019 inspect air filter, and inspect sparkplugs to see if colors look good and are all the same. consider replacing plugs with new. could be partly-clogged idle jets or something else in carbs. good luck. Link to comment Share on other sites More sharing options...
privatepile Posted May 15, 2019 Share Posted May 15, 2019 Get a picture up! Your fault almost certainly lies in the fuel system. You can try adding fuel treatments like Seafoam or Wynn’s , but In my experience it’ll do very little good. Your tank probably needs emptied and flushed out. The carbs need stripped and cleaned, and a new fuel filter added. While the tank is off it’s probably best to check / fit new plugs and air filter. Get the carbs balanced too. Ive got a 93 FP that exhibited similar problems to yours. I’m no expert but found stripping the carbs fairly straightforward and transformed the running of the bike Link to comment Share on other sites More sharing options...
Siborg Posted May 16, 2019 Author Share Posted May 16, 2019 Hi all and thanks for all the advice. Sounds like I'll have to bite the bullet and give the carbs a strip down and clean, once that's done I'll change the consumables . I'll keep you posted of my progress. Thanks again. Link to comment Share on other sites More sharing options...
squirrelman Posted May 17, 2019 Share Posted May 17, 2019 ALWAYS drain and FLUSH the tank on any newly-bought bike ! Link to comment Share on other sites More sharing options...
Siborg Posted May 18, 2019 Author Share Posted May 18, 2019 Update. Hi all. Ok, so I flushed the tank and removed the pet-cock to inspect the filter-all ok. Next was remove The carbs...however..when I went to loosen the straps/bands around the carbs where they meet the motor, the straps/bands on the two carbs nearest the radiator were loose-really loose. So I tightened it all back up (also noticed the sub air filter was knackered so have replaced) and took it for a ride. And you can imagine my happiness when it ran almost perfect. Still a light hesitation on pulling away but no backfires or loss of power anywhere else. So I'll balance the carbs,new plugs and air filter and hopefully... Thanks all for your support and knowledge. Link to comment Share on other sites More sharing options...
squirrelman Posted May 19, 2019 Share Posted May 19, 2019 Scotsman happy he didn't need to spend any ca$h. 😀 Good work, mate. Link to comment Share on other sites More sharing options...
Siborg Posted May 24, 2019 Author Share Posted May 24, 2019 Additionally I changed the air filter and spark plugs. I opted for the Champion 9698's instead of the NGK's and the bike runs perfectly. Thanks to everyone for their constructive support . My next project is an alternative to the stone age suspension and replacement to the rusty radiator. Thanks again for your advice and suggestions. Link to comment Share on other sites More sharing options...
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