hello,

many of you talked about the "exhaust baffles" of the TY/SY 125.

sorry for the...ignorance but what are them? is it better to remove them? how?

and...is the "undo" operation possible?

Thanks

m.

Take off the silencer - drill the rivets out of the end cap to remove it - slide out the long perforated tube that sits inside complete with the exhaust packing - there should be 3 steel tubes welded into the perforated tube at 90 degrees to it - grind away the weld on 2 of these tubes to remove them leaving the end one in place - don't remove all 3 (if all 3 have already been removed then weld one back in!) - re-insert the perforated tube and repack the silencer - rivet the end cap back in place. 15 minute job if you have the tools to hand.

don't remove all 3 (if all 3 have already been removed then weld one back in!) -

<{POST_SNAPBACK}>

Why do you believe they should not all be removed?

http://www.birkettmotosportukltd.co.uk/?Sc...4-Stroke_set_up

don't remove all 3 (if all 3 have already been removed then weld one back in!) -

<{POST_SNAPBACK}>

Why do you believe they should not all be removed?

<{POST_SNAPBACK}>

DG

They just get too noisey with no noticable power gain. Personally I think leave them all in but make sure you do the rejetting, that makes heaps of difference!

Downunder

don't remove all 3 (if all 3 have already been removed then weld one back in!) -

<{POST_SNAPBACK}>

Why do you believe they should not all be removed?

<{POST_SNAPBACK}>

DG

They just get too noisey with no noticable power gain. Personally I think leave them all in but make sure you do the rejetting, that makes heaps of difference!

Downunder

<{POST_SNAPBACK}>

I was just curious as to the source of all this wisdom. Mostly because there are four rods in the silencer, instead of the three referenced!!! Just get a kick out of all the info that get passed on to others, that is not based upon personal experience.

I removed all four rods from mine (along with the jetting modes) over a year ago. Performance is outstanding, and the noise level is far less than my riding buddies Montesa 4RT, with the restrictors still in. Not taking them all out may be better, but I have no experience with that setup. I sure would not advise someone to open their silencer back up, and add rods back, after they had already removed them!

Just as an FYI, I HIGHLY recommend the clutch kit (disc & plates) that is available from B&J Racing (www.bjracing.com). Making that mod was by far the best thing I have done to the bike.

I was just curious as to the source of all this wisdom. Mostly because there are four rods in the silencer, instead of the three referenced!!! Just get a kick out of all the info that get passed on to others, that is not based upon personal experience.

Yip, definately had three in this baffle before I took them all out - sounded awful and produced less power on the rolling road! So I made a complete new baffle from aluminium and welded one restrictor back in - guess what, only 0.1bhp increase, but hell it proved a point. That was on a very early TYS125F (maybe UK models are different), also have a SY125F but I don't recall how many that had in it and I can't be bothered to go into the workshop and check. Anyway thats my personal inexperience.

Edited January 11, 200620 yr by ScorpaF

When I spoke to the mechanic at Birketts about why to leave the 2 end restrictors in, he said he has found that the small increase in back pressure helps with the engine braking, i.e., it doesn't roll on so much when you shut the throttle.

Incidentally, when I opened mine up (2 yr old), the inner tube was totally rotted at the inlet end, made a new one from stainless perforated tube.

Regarding sprockets, I have a 10 tooth on the engine as I find it too quick in first with the 11 tooth / my duff riding mix. If I remember right I read on here that top North East teen Dale Robson uses a 10 tooth engine sprocket as well.