bogging down under load

[vanstub]

had a run out on bike yesterday was running fine @70 when i went to accelerate the engine responded at 1st then bogged down/ lost power
runs fine around town accelerates ok but again under load bogs down again
any suggestions

[MacV2]

Take the load off...eat less pies...

Hope that helps...

[popkat]

very dirty air filter can cause this situation or an airbox full of mouse and nest... Get Mcpestcontrol round to sort it



.

[tony.mon]

Check drain tube from the tank is clear, make sure that the vac tube going to the tap is not split, particularly at the end where is connects to the tap.
Check airbox for mouse nests.
Check fuel tap diaphragm.
Check tank filter.
If you have a K+N or other oiled filter fitted, it may have been over-oiled.

If not those, it's possibly a coil, or maybe plug, but check the above first.

[vanstub]

Check drain tube from the tank is clear, make sure that the vac tube going to the tap is not split, particularly at the end where is connects to the tap
Check airbox for mouse nests.
Check fuel tap diaphragm.
Check tank filter.
If you have a K+N or other oiled filter fitted, it may have been over-oiled.

If not those, it's possibly a coil, or maybe plug, but check the above first.

took tank off inspected vac pipe all seem good blew down drain tube
no mouse nests
Check fuel tap diaphragm.does this require removal of fuel tap
Check tank filter.this does require removal of fuel tap
hi flo air filter about 3000 miles ago

[MacV2]

Check drain tube from the tank is clear, make sure that the vac tube going to the tap is not split, particularly at the end where is connects to the tap
Check airbox for mouse nests.
Check fuel tap diaphragm.
Check tank filter.
If you have a K+N or other oiled filter fitted, it may have been over-oiled.

If not those, it's possibly a coil, or maybe plug, but check the above first.

took tank off inspected vac pipe all seem good blew down drain tube
no mouse nests
Check fuel tap diaphragm.does this require removal of fuel tap...Yes
Check tank filter.this does require removal of fuel tap...Yes
hi flo air filter about 3000 miles ago

[Cadbury64]

In addition to my VTR, I also have an ST1100 which I recently restored to a running condition after being parked up for 10 years with predictably clogged carbs/fuel pump. I thought I had a carburation problem as I had a stumble/misfire under load from 4k up, and spent a lot of time on the fueling system. The bike started and ran great at low revs, but bogged badly in the midrange.

Turned out that my problem was ignition related, and specifically I had low voltage going to the coils and so a weak spark. I traced the fault to a dirty connector that fed power to/from the right bar switches (red connector). You should be able to check for normal battery voltage to the black/white pin on the ignition module.

[vanstub]

Changed coils today with a set off Macs many bikes but issue still there
so before i take fuel tap apart will order the spares

[vanstub]

Happy days sorted it out with MacV2's assistance and another dip in Franks spares box
the issue was the diaphragm in petrol tap perished
revs all the way thru the gears now no dramas

[fabiostar]

bit of a hijack but iv noticed mine lately can,hold back, not splutter or anything but if you wind it on to fast between 4/5k it just waits a second or so before it starts pulling hard. not really any other revs just at the overtaking handy revs you wana use .

[MacV2]

Happy days sorted it out with MacV2's assistance and another dip in Franks spares box
the issue was the diaphragm in petrol tap perished
revs all the way thru the gears now no dramas

Well there were some dramas but what happens in Grain stays in Grain...ya no what I mean... You ain't seen me right...