BGM Clubman Exhaust

[immylam]

I running a mugello 186 on a 25 mm PHBL dellorto and just changed from an ancilloti which ran fine to a bgm clubman (ancilloti didn't fit right , bracket snapping etc. muggy problem solved for me by this forun ) .....and it doesn't seem to rev out now. It is fine up to 65 and then it just hits a wall feels like it is dragging, running with a 105 main jet although I might up this a bit and see if it performs better. If not I am going to try a 28 mm dellorto and see how that goes but I was told there is a problem with the BGM clubman exhaust revving out , anyone had this problem?

[Timbo]

I ran mine with a 26 but changed to a 28 and it revs out fine, had it sorted on a dyno. Is your clubman secured to the bottom of the crankcase?

[immylam]

Yes secured on bottom of case , changed carb tonight to 28mil , changed plug, lead,CDI and HT lead tested the stator and it is ok, but scooter is still not revving out ,Great up to about 3/4 revs about 60-65 then it feels like it is breaking down and starts to slow and drag if I try and rev on.

[Velo Merde]

i am running a 118 main jet on 25mm and a 128 on 28mm dellorto. same exhaust but 200cc cast iron, well portet with reed. i guess you are running to lean. give it a try.

[immylam]

Was running the 25mil with a 105 main and now running the 28 with a 118 although I think this is running rich rather than lean but I''ll will rejet tonight from 105 upwards. Hopefully this will sort things out. I can try a PM pipe although specifically want a box pipe. I had not heard of a problem with the BGM's but was told last weekend by a well known shop owner that they don't rev out. Hope this isn't another expensive doorstop especially as I went out my way to buy the correct swan neck as the ancilloti and an indian big bore both snapped at the bracket (a known mugello problem)

[shocky]

Wow 105 does seem smail I running a135 on a 22mm carb on a 200 whats the rest of your jetting like does your choke seat fully I only ask as someone I know had one that didnt and he had similar jetting to yours on a 200

[Timbo]

Mines a 105 mj ...I'm not an expert but it could be your gearing....

[immylam]

pilot back down to 50 from 55 X2 needle top clip and main jet down to 108 , seems to be fine now but will plug chop and check over the next few days. Thanks.

[Donnie]

I would as you just went leaner on idle, mid range and top end all without plug chopping each one individually

[purple_pill67]

I have a 105 on my rt225 with same clubman amd 28 phbh.