RG150 short on power

[Sharft 6]

my power valves are 3 piece and slide nicely as long as I don't do those two lower screws up too much. I even cut up a washer and added it in so that I could do up the two lower screws securly without pinching the valves.

TBH the power band isn't particularly amazing anyway. It will allow me to sit up and still pick up speed where as in the mid range I need to move to a tucked position or change down a gear, otherwise I won't get past about 80 or 90KM/h. Infact even with the power band and tucking in, there is an even higher gear that the bike doesn't have enough power to drive.

[Sharft 6]

Many many thanks to billy from racefairings.co.nz for telling me to check the power valves are not upside down. Only took 4 months to figure that out :-)

Now they're up the right way, the bike has a mountain of power!

[speeding_ant]

Many many thanks to billy from racefairings.co.nz for telling me to check the power valves are not upside down. Only took 4 months to figure that out :-)

Now they're up the right way, the bike has a mountain of power!

Classic

[matrox02]

I recently bought an RG150 because I had already test ridden someone else's and I thought the extra power would keep me entertained for a while.

Unfortunatly though, mine is really sturggling to get to 100km/h.

Petrol
It came with very little fuel in the tank. It now has fresh (4day old) fuel.

Oil
It had an oil leek and very little oil in it when I got it. The oil leek is fixed now and the tank is full of fresh (about 3 weeks old) oil.

Battery
It came with a flat battery so I have replaced it with a brand new one.

Spark plug
I replaced the spark plug with a new one that happens to be colder. I think it prefers the old hotter one.

Power vavles
I have spent hours on the power valves because from what I've read, I thought this was by far the most likely problem.
The right power valve is somewhat 'flogged out' in the middle but I can guarantee the valves are fully actuating under the power of the pulley system. I did a test with the valves left as is vs stuck open. It accelerated a little faster when the valves are left as is. When the valves were stuck open, there was no kick of power in the high end. Instead, it ran out of puff at exactly the same way as it did before.
If I leave the bike in neutral and rev it up, I will see the pulley turning and notice the rpm increase when this happens. When it's under load, I don't think it has enough power to reach the power band. It's quite hard to see the pulley directly from the side while riding the bike, but from what I can see, the pulley doesn't move while riding.

Warming
It's quite hard to warm up but I got it to 1/8 on the temp guage for testing.

Carbretor
I opened it up to find the cleanest carbretor I've seen yet. And I've seen 3.

Cylinder
I did a dry compression test and it's blowing about 100-105psi. I have no idea what the compression should be though.
I'm about to open up the cylinder and clean off the carbon deposits.

Exhaust
I'm about to decoke the exhaust.
Either the expansion chamber is a strange shape or it has dents in strange places. Will take some pictures later and post them if necessary.

In case you're wondering why I haven't posted any RPM figures, it's because the rev counter doesn't work. I don't think I'll need it after the bike is fixed anyway.

I'd really like to have the bike ready for the trackday next weekend so if any of you have suggestions, please send them my way.

wow only 100 PSi? that could be the cause, My '90 rm250 sits around 160 psi and there arnt many other bikes that like any less than 120 psi on the poor side

[Sharft 6]

Don't worry it's pulling very hard now. Getting to around 160Km/h at manfield and still gaining speed so I'm not complaining.

it's around 105psi on my compression tester and about 90psi on another. I think the person who said compression tests are pretty subjective is right.