no power after 120ks

[rg 250 freak]

heeelllppp
im having trouble with my 83 mod rg 250 goes hard then i change in to 5th gear at around 120 ks and it starts to die will slow right down to 80 ks but it can stay their till i changeback to 3rd or 4th can any one tell me what they think is goin on
please
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Full throttle all the way

[Stevie GooGs]

does it do it in all gears? ie when you go into 4-5 and be hard on the throttle does the bike's revs soar more than normal?
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Current: 2019 Yamaha T7 -> 2015 KTM Superduke R | 2000 Yamaha R1 Past -> 2009 KTM 990 SM -> 2005 kawasaki ZX10r -> 2000 Honda CBR 600 FY -> 2002 Honda XLV 125 Varadero
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[Kickstart]

Hi

Is it staying in the power band when you change up at that point? Have a feeling it might just be dropping out of the power band and then not have enough power to maintain the speed.

1983 model would be an early RG without a power valve I think, so there will be a large difference between in the power and out of it.

Getting on a bit, possibly needing new pistons and a good service would make this problem worse.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[rg 250 freak]

yes it is getting on bit but it has had a rebuild it was bored out to nearly a 300 thats what the guy told me i also tried the needle adjustment to give me more fuel but it didnt help thought it also might need different jets because it has been rebored so keep going with the help
thanks
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Full throttle all the way

[rg 250 freak]

thanks for the reply steve but the revs die down when i change into 5th but it still goes hard from 1st to 4th
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Full throttle all the way

[oneil sg1]

Is it a Japanese import by any chance?

[Kickstart]

Hi

Needle only really affects the mixture in the mid range. However running lean on a 2 stroke tends to result in rather sudden and disasterous engine problems.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[sickpup]

It won't need rejetting for the big bore. Does it still have its airbox?

[rg 250 freak]

yes it does still have its air box
and what i have been told that it is an import bike
but i cant tell the difference . i have been fiddling with it for a few days and have been adjusting the mixture screw out bit by bit the same on both carbs and now it takes off well .tonight i had it to 140 and still one more gear to go it seems to be running well does this mean i have done the right thing or not
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Full throttle all the way

[oneil sg1]

If it,s an import,there,s a good chance it,s restricted to 112mph,

[rg 250 freak]

well dont stop there how can i tell or find out what do i look for and were is it ppppppppppplllllllllllllllllleeeeeeeaaaaaaaasssssssseeeeeeee
help
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Full throttle all the way

[sickpup]

[rg 250 freak]

thanks for the info mate have you any more info on these bikes
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Full throttle all the way

[Kickstart]

Hi

Even if it was restricted then the restrictions came in at 112mph / 180kmh, a long way after this one is flat out (although the CBR250 seems to have an anti tamper device so that if you disconnect the speedo it limits the performance even more).

The mixture screws only really affect the mixture at very limited throttle openings. The jet that mainly affects the mixture on full throttle is the main jet which cannot be adjusted, you just have to substitute larger ones in their place.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing