top end

[pricey797]

hi all cant seem to keep any speed up in 5th and 6th gears , bike goes well through the first 4 when changing up seems to bog down after going into 5th any ideas

[jackup]

What's your jetting on your carb also does your barrel say 10v?

[pricey797]

hi jets are a 195 which sugests a 12a carb and my barrel says 10w but head says 10v

[cj]

Sounds daft but worth checking sprocket ratios

[pricey797]

sprockets are 16 front and 46 rear would it be that its a deristricted engine and a restricted carb seems its all a 10w head and so on with a 12a carb

[jackup]

Spokets are fine heads fine carb is jetted standard so unless you have got a micron on its could be something blocking your carb give it a good clean and blows out

[pricey797]

carb been cleaned , correct me if i am wrong but a standard 12a restricted carb is fitted with a 195 main jet and a 2.5 air jet , 0-2 needle and the 10w de ristricted carb is fitted with a 155 main jet a 1.0 air jet and a 0-8 needle , so if i have a 10w head, exhaust with hitec reeds should i no tbe using a 10w carb , i understand that the carb i have is jetted standard bu twith everything else 10w would it be beneficial to get a 10w carb

[mellow]

Heads have 10V on im sure
i doubt its ur carb as they work on throttle position as such.Read the Mikuni carb tuning bit in TECH SECTION.
I dont think any rev out in 6th. mine will do 80 all day everywhere in 4th but show it 5th gear n u have to have the revs right up in 4th to keep it in the band
Id say go down one on front sprocket or up 2 on the rear
and good luck finding a 10W carb ;D

[jackup]

I agree with mellow fitting a 10w carb won't make a difference go back to basis do a plug chop check your kneedle valve ,make sure your choke circuit is clear also fit a standard reed block and check the rubber around the reed block for a good seal .if you need a standard reed block I am sure I've got one you can have foc

[pricey797]

can i ask why a 10w carb wont help , not being funny or anything and i certainly dont know it all but why would there be a restricted carb 12a and a full powercarb 10w if it wont make a difference, or am i missing something simple here

[jackup]

It's might make a difference but only if the carb you got was clean should get the same results with a clean 12a and a unrestricted exhaust

[pricey797]

will a standard airbox help any , got the connection part just need the top chamber , also its lumpy if you hold throttle on around 1/4 to 1/2 at low speeds , ie doing 30 at a steday throttle input its lumpy soon as i open throttle its great

[pricey797]

anyone localish to anglesey that could listen / road test it fo rme its my first one so no tsure how it should be anyway am i expecting too much

[jackup]

That's your problem you need a standard air box in the meantime try upjeting to compensate for the increased air flow I've just sold my spare air box to snowbound so good luck getting one

[pricey797]

sure norbo has the parts i need for sale on here so payday big order from me , got the part that links the airbox to the carb in its way fron the well known auction site and just got a 10w carb from the same site also on its way so hopefully it should improve in next couple of days

[billy]

What does it say on the exhust? We had a Y11 (or something like that, I can't remember the exact serial numbers/letters atm) exhaust on dads 125, and it was restricted like mad. We then put on a 10w exhaust and hey ho, it went fine.