Innova dying when throttle ripped open
Posted: Thu Jun 21, 2018 5:56 pm
Hi all,
I'm still having what seems to be a fuel issue on my recently acquired Innova which I think is probably something relatively simple - I need the help of some engine wizards like yourselves!
The issue is this: (these conditions are exactly the same while the bike is on the stand in neutral, on the stand in gear and while riding on road) - If I quickly open the throttle fully, the bike bogs and cuts out. The throttle will operate fine if I open it at a normal acceleration speed, until I get up to around 3/4 of full throttle, at which point the engine feels and sounds like it's pushing against something and makes a "rrAAUM rrAAUM rrAAUM" sound. If I drop down to just below 3/4 throttle it performs better, but obviously I'm not 'unlocking' the full throttle potential.
what I've done so far to try and remedy it: I took off the carb and dismantled it, blew all the jets with compressed air, poked them with a single strand of copper wire, sprayed some Wynne's all over the float, body and jets and left it all for an hour or so. As far as I could see all the jets were perfectly clear before I put it back together. One thing I noticed was that when i was emptying the fuel from the carb out into a pot, a few flakes of (what seems like) thin rubber sheet came out of the fuel supply inlet pipe - their presence before and lack thereof now seems not to have made a difference to the engine performance. The float bowl had a bit of gunk in it, which I've cleared out. Some nasty greeny-brown varnishy looking stuff dripped out of some of the small holes below the choke flap when I tilted carb after the Wynne's had been in there a while.
I realise I may not have totally cleaned the carb as well as I could have. Other than this - the air filter is ok, all the breathers from the carb and airbox are clear (i can blow through them fine at least) including one that has a fat white plastic cylinder in the middle of it, the fuel seems ok (although I can't know this for sure). I haven't had the plug out yet for lack of the right sized tool (oo-err) but I do think this is more of a fuel / air issue than anything else.
https://imgur.com/a/uvIWpuI - couple of pics there of the carb for anyone who cares to look
once again, i'd be delighted if anyone has any suggestions!!
thanks
I'm still having what seems to be a fuel issue on my recently acquired Innova which I think is probably something relatively simple - I need the help of some engine wizards like yourselves!
The issue is this: (these conditions are exactly the same while the bike is on the stand in neutral, on the stand in gear and while riding on road) - If I quickly open the throttle fully, the bike bogs and cuts out. The throttle will operate fine if I open it at a normal acceleration speed, until I get up to around 3/4 of full throttle, at which point the engine feels and sounds like it's pushing against something and makes a "rrAAUM rrAAUM rrAAUM" sound. If I drop down to just below 3/4 throttle it performs better, but obviously I'm not 'unlocking' the full throttle potential.
what I've done so far to try and remedy it: I took off the carb and dismantled it, blew all the jets with compressed air, poked them with a single strand of copper wire, sprayed some Wynne's all over the float, body and jets and left it all for an hour or so. As far as I could see all the jets were perfectly clear before I put it back together. One thing I noticed was that when i was emptying the fuel from the carb out into a pot, a few flakes of (what seems like) thin rubber sheet came out of the fuel supply inlet pipe - their presence before and lack thereof now seems not to have made a difference to the engine performance. The float bowl had a bit of gunk in it, which I've cleared out. Some nasty greeny-brown varnishy looking stuff dripped out of some of the small holes below the choke flap when I tilted carb after the Wynne's had been in there a while.
I realise I may not have totally cleaned the carb as well as I could have. Other than this - the air filter is ok, all the breathers from the carb and airbox are clear (i can blow through them fine at least) including one that has a fat white plastic cylinder in the middle of it, the fuel seems ok (although I can't know this for sure). I haven't had the plug out yet for lack of the right sized tool (oo-err) but I do think this is more of a fuel / air issue than anything else.
https://imgur.com/a/uvIWpuI - couple of pics there of the carb for anyone who cares to look
once again, i'd be delighted if anyone has any suggestions!!
thanks