Optimum RPM to change gears on a Honda CBR 250R?

[Hiflyer]

has anyone ever had problems with hitting neutral when trying to shift fast at high rpm on a CBR250? what am i doing wrong? sometimes its not even neutral it can be between 2nd and 3rd, 3rd and 4th etc.... i throttle off, pull the clutch right in and give it a decent 'kick', but it still managers to get between gears. Only happens when i change at 15k+ rpm... i can see this being a problem if i take it to the drags

Might be a problem with the oil in the box? My hyosung had a problem where it wouldnt get neutral unless it was moving, chucked a lighter weight oil in and it was sweet.

Probably want someone more experienced than me to answer that though...

[avgas]

haha and how would one toast his clutch? too much RPM off the mark?

Yeah letting is slip to much. Just general wear on the plates. Usually in first.....

Thankfully mine was not that major, turned out previous owner had put motor up in it. So when it was getting near peak temp, was making the plates slip like a mother.

But have ridden bikes with f-ed clutches. Through general thrashing. They basically slip like hell.

[over5tayer]

Change your oil. Chances are you have FNS (false neutral syndrome).

....chucked a lighter weight oil in and it was sweet.

I'll do an oil change now, i think its nearly due for one anyway - that could explain the gear change situation. Will 10w-40 be sweet? and whats the best brand? im guessing cycle(extremely expensive)treads is where i should be getting the oil/filter from?

I think ill just do a DIY - cant be that much different to a car .

[Hiflyer]

I'll do an oil change now, i think its nearly due for one anyway - that could explain the gear change situation. Will 10w-40 be sweet? and whats the best brand? im guessing cycle(extremely expensive)treads is where i should be getting the oil/filter from?

I think ill just do a DIY - cant be that much different to a car .

It's easy as, cycletreads is quite competitive when it comes to oil, I have a hornet, 99% same engine as yours and I use Motul 15w-50 ($25 a litre or a bit less If I remember) and it's runs smooooth as.

The oil change is probably what it is I reckon

If you're replacing the filter as well, the bolt to remove the filter is near the sump plug, more towards the middle of the engine and has a big Circle thing (technical term right there) that comes off with it.

Anyway back on topic, i find that changing up around 16k is the best on my hornet (When it's actually running), otherwise the power starts to drop off a bit.

[JK12]

ohhh i see. Probably best to keep in minimal anyway. cheers for that. anyone keen for the drags on friday? suppose to be decent weather

Clear weather the whole day, which is good. Will txt u regarding the ride to mere.
According to http://home.nzcity.co.nz/weather/wea...ail.aspx?wla=3

[over5tayer]

It's easy as, cycletreads is quite competitive when it comes to oil.....

Cheers , i ended up getting 10W40 hope its not too thin... Set me back $77 for 4L of Motul and a filter which wasnt too bad. Sorry for going off topic Westy...


What time does the strip open on Friday? and what are the $costs$? i'll be keen to do the motorway haul with you if you wanna meet up somewhere.

[racefactory]

What's your weight mate? Aim for a 14.1 or so... guys on here have done that on stock CBR250s.

Keen to take the RVF400 along this friday and get some V4 down the strip.

revlikeshit- have you done any runs on the ZXR400 CBR400 VFR400 etc?

[JK12]

I'm meeting at 5-5.30 at cycletreads

[Westy_mate]

Cheers , i ended up getting 10W40 hope its not too thin... Set me back $77 for 4L of Motul and a filter which wasnt too bad. Sorry for going off topic Westy...


What time does the strip open on Friday? and what are the $costs$? i'll be keen to do the motorway haul with you if you wanna meet up somewhere.

Hey mate, $15 to watch $55 to race
meet at Cycletreads at 5:30 if you can if not meet at the Caltex at the bombays around 6:15-30ish sweet?

txt me on 0210592568 if your keen

[Westy_mate]

http://www.kiwibiker.co.nz/forums/sh...gs-at-Meremere

if anyone is keen for a ride to the drags

[revlikeshit]

Racefactory - na i havnt run a 400 on the strip before, seen a few run at meremere and i know what they should run on a decent pass though. most stock sports 400's should run anywhere between 12.5 and 13.5 stock and trap 155-170kmh.

vfr and rvf400's tend to be middle of the 400 pack in terms of power. Only thing holding them back tend to be their long 1st gear( for a 400 ), same problem i had with my 600 first time out,unless you give them heaps off the line the'l bog hard and cost you quite a bit of time winding through 1st.
If you could go low 13's or faster on one and trap 160+ then your doing alright, vfr/rvf's are neat bikes though, cool sound and becoming worth a bit now.

[over5tayer]

Thanks westy, had heaps of fun





<<------ my best time was 14.260 @ 150.54 kph

[nadroj]

Lucky... double breakout for the win.

[racefactory]

Nice one mate!! That's a good time. What's your weight and were you running a full tank of fuel?

Sounds like you using clutch for up shifts?

Probably could get it to 14.1 or 14 flat without bogging just that little bit and clutchless shifts you think?

If you didn't have to shift before the line and all of the above you could maybe just break 13's I think!? A good goal maybe haha.

[over5tayer]

Nice one mate!! That's a good time. What's your weight and were you running a full tank of fuel?

Sounds like you using clutch for up shifts?

Probably could get it to 14.1 or 14 flat without bogging just that little bit and clutchless shifts you think?

If you didn't have to shift before the line and all of the above you could maybe just break 13's I think!? A good goal maybe haha.

haha thanks . Last time i weighed myself i was 67kg but that was a few months ago... I had around 5-6L of fuel left in my tank.

Yea i was using my clutch for the first few runs which were getting me consistent 14.46's. My camera stopped working after about the 3rd run where i started to clutchless shift (for the first time) - doing that got me the 14.260 (don't have the video). Im sure if i learnt to shift better and turn up with less fuel, i'll be able to scrape a few more milliseconds off