Killachipmunk

Have you pinpointed exactly where it is? Also, have you checked the engine has enough of the right oil?

Alright there lads, I've got a technical question for you mechanics. Right now, I can't afford to buy a sports exhaust for my R125, but I've seen on another forum someone that you can cut the exhaust down to make the sound better. I can give pictures of my own bike if needed (just not at this time) Not the best picture, but it will do (Alternative Image) The mod consists of cutting down the little tube poking out of the end of the end cap down to the main silencer body, it's about 3 inches of pipe that goes missing. Idea being the exhuast gasses expand in the cap, rather than straight out of the back. You can test it by holding the cap a few inches away from the exhaust, it gives a lovely sound I can only describe as a slapping pop, like on a dirtbike. What I want to know is: Are there any DOWNSIDES to doing this? I've heard a rumour of backpressure changes from doing so. The opening won't change size, just length. Thanks guys KC

Hey, I had one of these bikes until last month. I'd highly reccommend an aftermarket exhaust rather than modifying the standard one. I had a Metrakit RK (They sound amazing). The only other modification done was a carb jet, not done by me. If there's no rev limiter restriction, this should be all you need. I never had any gear ratio changes, I could do medium hills in 5th and I got 65mph in top gear. (Only weigh 8 stone though). The main thing is to remember that on a 2 stroke machine like yours you will get no power in the low revs, basically if you're under 7500 RPM, you're not going anywhere. Hope this helps KC

Haha, well it's not exactly new! God knows I can't afford that price, but it's in damn good nick

Man, I don't really know the true problem, but I put the rectifier back on and I can't re-create that 60mA drain, testing the rectifier as a Half-wave shows all the diodes as properly connected, and I've measured the battery off-bike with a bulb and measured a 10 Ohm internal resistance. It'll keep a 12V EMF reading like this, but once asked for load from the starter, it dives to 6V.

Yeah, I'm looking forward to the R125! I think I'll be alright with the extra power, I've never been one to be calloused with the throttle, got on alright with a quick go on a GSXR after all Yamaha's been good to me, I think it's probably worth that little extra to get a brand I trust. Plus the CBR is like riding a sheet of paper, I've had bicycles with wider tyres!

Thanks for your help Jim, I wasn't thinking right and was clutching at straws a bit (this bike needs to be sold soon, and I don't want to be forking out cash) and getting a bit mental. Turns out it's actually a half-wave rectifier, but with what seems to be an extra diode to the basic versions I know of. I'll check the charging circuit tomorrow and make sure, but seeing as my battery registers about 10 Ohms internal resistance, I think that's the main problem I'm having here. Not a discharged battery, but a ridiculous in-circuit voltage drain. Sorry to waste your time man.

Alright guys, what's gwarnin'? Thought I really should say hi, I finally signed up to the forum! Been reading on here for a while but never really had a reason to join up. I've had my TZR 50 for about 8 months now, they really are brilliant bikes! So much sexier than the other 50ccs out there, and they don't explode every 30 miles, which is nice. They're pretty rare though, which is a shame, I wish more people could experience this fun! I ride mainly in the city, with busy rush hour traffic both ways, I think I'm getting pretty good at extreme riding, drivers have no spacial awareness, that is for SURE! Getting an R125 in about 2 weeks, really looking forward to it and can't wait to do some long distance runs, (oh, and being able to do 60 without the redline would be nice ) See you around guys KC

Thanks for the help, but shouldn't the rectifier contain 4 diodes, with current from - able to flow to both AC pins? I will be checking the charging system when it stops raining, as I can't start the bike without bumping, but from my knowledge of rectifiers, I should be getting a reading from - to either AC pin, right?

For anyone who owns a TZR 50, and believes their rectifier is broken or damaged, it is a Half-wave rectifier!