sheffy

Ive tried a wrench.... There isn't enough clearance to remove it.

Update Went out to start the bike last night and It wouldn't start. Tried reserve fuel, choke on and off and bump starting. When bump starting it made a judder sort of movement and refused to start. Its firing just not starting! The kick start feels dodgy and it usually starts first time. My fear is its seized! Any help would be greatly appreciated!!

Cheers you lot! And if it seizes............ im going to cry :'( Tah again.

Sorry airhead, I just had an idea though... we're all talking about making it richer when.......... isn't bogging down a 'rich symptom' so leaning it out may make more sense, seeing as it refuses to accelerate in 6th and slows right down? Any ideas? Cheers.

Not to sound offensive, but you don't recommend re jetting for a performance exhaust, where as almost everyone i've spoken to (online and in garages....even the shop who sold it me) says it may need rejetting. Not a dig by the way! Cheers for the help!

Well i'm not sure of this because... yes it works as a simple diagnosis in some cases as restricting the air flow richens the mixture causing a 'better' running condition. However I think in my case, its under fueling at the top end not lean (in a sense it is lean lol) Any how it didn't make a positive difference, just bogged severely. From that I presume its running well untill higher revs. I'm about to order some more jets, as someone said its worth it for a few quid to prevent seizure or worse Stock is 240, so shall I order 3 or 4 or more higher? Thanks guys, you've been great!

Cheers guys! Great forum here

Thanks ken, I will try tomorrow. I spoke to a local bike mechanic who said "Check the main jet size, if its less than 240... don't ride it" By that i presume he means that anything less that 240 will fry my piston ? does anyone know what size i need to buy, 5mm or 6mm etc.

Yes the old pipe was derestricted, gutted and welded back together. But this new pipe is an aftermarket pipe that is basically the same but just lighter. Its a big one ( ex fresco).

I'm sorry but I don't understand what turning on the choke will prove.... Thats the first thing i did and it just bogged down too much to notice a difference in the higher revs.

To be honest, changing the exhaust would not cause the PV to stick open I haven't got a plug spanner to check the spark plug but to me it feels like under fueling when i hit high revs = main jet too small? Cheers.

Would running lean cause a loss of power? It just doesn't rev out very quicly and revs take a bit longer than usual to return to idle. It is so much slower than previously. Cheers for your help guys. Keep it coming if possible. Sheffy.

Well is there a large chance of seizure? It will do 70 odd in 5th but literally decelerates in 6th, Not what I had hoped for. Well the bike has a full big one system and just isn't running well. Should I remove the snorkel or shall I order a few main jets slightly bigger? Thanks. Sheffy. Hope you all are having a good xmas!

Hello, I recently purchaced a 1999 DT 125 R. I have had it serviced and have had fresh tires and a new expansion pipe. The old one had been eaten through by rust and so was blowing. This is where the problem lies. I left the garage and allowed it time to warm up properly and took it for a spin. It lost all its low and medium end power and hits a powerband at around 8k revs. It feels slower and is difficult to keep in the power. I went on the dual carriageway to see if it would pull through each gear and see what it tops out at. The top speed went from 81 with the derestricted stock pipe down to 71 with the new exhaust. When I change into 6th gear from 5th at 10k revs it 'bogs out', stops accelerating, and slows down until I have to change down. Could it be running lean as it wasnt upjetted from the previous exhaust and apparently you need to go one size bigger on the main jet? 240 to 250 is it? Thanks in advance. Sheffy.

Hello, been looking over the forums for a while now and I now i've decided join (I need some help ) Cheers, Sheffy