2010 Pulsar, a little more speed/power?

[marty]

Anyone have any tips for squeezing a little more speed/power from a 125 Pulsar?
It will get to 'about' 110 kph at 10K RPM then it seems like the CDI cuts the revs down to 8K RPM.
I have orderd a 16 tooth front spocket (original is 15 teeth) and a so called 'racing CDI' that has a higher rev limit.
Has anyone here had any experience with aftermarket CDI boxes?

Also the engine, is it Kymco's own design or is it a clone of a Honda or something? and are there any big bore kits available?

I'm not looking for 160kph or anything like that, just a genuine 130kph would be OK.

A few years ago I had a 150cc chinese (unkown make) cross bike, I changed the carb to one a little bigger and it make a massive differance.
What size carb is fitted as standard to the Pulsar?

Any aftermarket exhausts?

And one last question there seems to be load of various vacumn pipes on my engine, I assume there is a vacumn operated fuel pump? and what is that pipe coming out of the head?

[Cortez]

Other then the stuff you already did, people will usually replace the exhaust and
air filter with more open stuff, and you'll need a rejetting of the carb for more fuel flow.

I wouldn't expect big improvements, but even 1hp more will be more then noticeable.

p.s. Most "race CDI"'s are a scam.

[marty]

I don't seem to be having any luck finding an exhaust, is there such a thing as a universal type?

[Vivo]

The best way to replace sprockets is sprocket front and rear combinations. Sprocket combination depends on other factors like engine power, transmission, your weight plus the bike, and preference whether on top speed or acceleration.  Get several pairs and test for the optimum. Greater acceleration will sacrifice top speed and vice versa. 

Here are some I've tried on my 110cc underbone:

Average acceleration and speed
1) 13/35 = more on acceleration
2) 14/35 = average
3) 15/35 = more top speed

High speed combinations (poor acceleration)
1) 13/34 = fast
2) 14/34 = faster
3) 15/34 = fastest

Your engine looks like the Honda TMX155. Instead of rejetting, try swapping carb of 155. For after market exhaust, it's usually custom made.

[marty]

Been a little busy 
So far I've now fitted a 30mm carb and port-matched the inlet to the carb. On order is a cone type air filter and I have a nice exhaust to go on too.
The main thing I've done is fit a 149cc barrel bored out top 63.5mm giving 158cc 
I've also orderd a 39 rear and 17 front chain cogs (original on my bike was 16/41)
Not really tested it yet as it has to run in but there is alot mote torque there!!!! when I fit the 17/39 cogs it should be nice.
Still waiting for the "racing" CDI to arrive (ebay cheapo thing from China)  as well as a Bi-Xenon headlight kit.

[thejimmy91]

any more updates on here?? because im very interested to find out the difference it make

[marty]

Well it is more or less finished  

The 160cc cylinder gives alot more torque and coupled with the 17/39 gearing you can drive around at the same speed with lower RPM's.
Mine does a steady 80KPH at 6'000 rpm while it was nearer 8K before.
Jettting was (and still is) a nightmare, the 30mm carb (26mm slde) was a no-go no matter what jets were fitted but the original Kymco carb (26mm with 20mm slide) works VERY well using the original pilot jet #40 but the original main jet #92 was too small. I had no joy using Keihin jets (the proper ones for this carb) and ended up with a Mikuni 97.5 main jets and the needle on the 2nd lowest setting.
I now have a 27mm carb (22mm slide) that I am playing with right now which is more or less running quite well but I havn't really noticed any performance gain so I think I will refit the original carb and retain bettery economy.

Racing CDI wasn't as great as the ebay add claims (no suprise) but it does feel a little more "punchy" with it fitted.

Universal "megaphone" exhaust fitted, sounds fantastic but a little loud  

HID light conversion was outstanding!!!!!!!!!!! if you do nothing else do this   night driving is now a pleasure.

Top speed now is an indicated 115KPH (just over 70mph) before 100KPH (nearly 63mph) would be about it. This is on the flat and I'm a fat git too  
I have touched 120KPH downhill, any faster and I think it would explode.

I think a higher compression piston in the future might help but for me it's too much work/expense for a small bit more power. After all the bike isn't really built for high speed and the couple of times I've done 120KPM it feels a bit dodgy.

[marty]

Well 1000KM's later its running really sweet  BUT I saw a 250cc engine on ebay and couldn't resist it 
I'll be fitting it this weekend. Double the power of the original engine at 14.7KW (20hp)
Should be a straight swap but I'll need to modify the engines top mount as the cylinder is approx 8-9mm taller.

[marty]

Fitted the 250cc today  was a tight squeeze but went in with a few mods