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Bogging Bultaco I have a 1972 bultaco pursing 250. When i rock the bike back and forth it starts bogging. When i stop rocking it the bogging stops. What could be the cause of this. And when i lean the bike turning the loads up. I have to hold the throttle wide open i turn off the gas once the bowl starts to empthy it stops. I turn the gas on its ok untel i turn. I clean the carb. ( mikuni 32mm) The has indiuidual floats and one might be sticking but not sure.

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  • Motorcycles Master
  • 42,218 Answers

Indicates problem floats or needle and seats
take the carbys to a specialist carby shop and have them full reconditioned

Posted on Jun 26, 2017

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Posted on Jan 02, 2017

ginocussen
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SOURCE: trouble removing carbs on 96 CBR 600 F3

Theres a big lip holding it. Make sure all cables and pipes/hoses are removed, spray with some WD40 or similar spray lube and then try prying it with something that won't damage the carbs or engine.

Posted on Apr 09, 2009

  • 375 Answers

SOURCE: I need tuning specs for my 1982 suzuki gs 750.

You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

Posted on Jun 29, 2009

  • 311 Answers

SOURCE: throttle bog out

hi,this may help,check the inline fuel filter and the air filter,if it has been sitting that long the fuel filter may have gummed up(a slightly gummy residue left behind after fuel evaporates) the engine will run ok at low and medium throttle but the filter will be quite restrictive once the load goes on,change the filter and clean the air filter and you might find the problem disappears...hope this helps...cheers

Posted on Jul 31, 2009

  • 1 Answer

SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load

I have the same problems with my 1999 TTR 250, were you able to find out anything?

Walt
goalhawk@hotmail.com

Posted on Aug 07, 2010

  • 129 Answers

SOURCE: bike is back firing and bogging down when I get on

Before adjusting the carb, has the bike been setting for a long period of time? Has anything been done to the bike that would change carb settings? If it's been setting, there is probably a gum build-up in the jets and fuel passages. If it sat all winter, my solution is to add 1/2 can of SeaFoam to the gas, lock down the front brake and rock the bike back and forth mixing the fuel and additive well. Start the bike and run at a high idle until engine temp is normal. Shut it down and let set for an hour or two, allowing the mixture to work in the carbs. Restart and run at high idle again. If it seems to clear up somewhat, ride the bike several miles to check if it worked.

Posted on Apr 15, 2011

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Before adjusting the carb, has the bike been setting for a long period of time? Has anything been done to the bike that would change carb settings? If it's been setting, there is probably a gum build-up in the jets and fuel passages. If it sat all winter, my solution is to add 1/2 can of SeaFoam to the gas, lock down the front brake and rock the bike back and forth mixing the fuel and additive well. Start the bike and run at a high idle until engine temp is normal. Shut it down and let set for an hour or two, allowing the mixture to work in the carbs. Restart and run at high idle again. If it seems to clear up somewhat, ride the bike several miles to check if it worked.

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You're much better off to buy high-octane fuel than to try to improve poor fuel with additives. Poor fuel is poor and that's all there is to it and, in my opinion, there is some pretty poor fuel being sold today. You might have to get into the dyed, off-road only fuels to find something this bike likes, a two-stroke that's running on the pipe can hit impressive pressures in the combustion chamber, so quality fuel is in order.

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Go through this, get back with me on the 'comments', we'll get you going.

lp

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