High revving engines

[ducatilover]

I have had a GSX 250 Invader... 9000rpm at 100kph is normal. However it was an IL4.

Parallel twin with circa 27hp.

[4AGE]

My cbr250r sits at about 8k at 100kph its a bit unsettling at first but i got used to it.

Although the redline starts at 18k so its not even half the revs.

9k with 13k redline sounds quite high though.

[\m/]

My 2000 GSF250 redlines at 15000rpm, used to do about 8400rpm at indicated 100k, went up a tooth on the front and now sits at 7900rpm at indicated 100k.

[GrayWolf]

Hi Folks,
Can someone out there enlighten me with their mechanical wisdom? I am getting back into motor cycling so have gone and purchased a 2004 Suzuki GSX250 inline twin. Rides well and is great little machine to get the "feel" of things again but........ I am not used to these high revving engines. To ride at 100kph, in top gear, the engine is pulling about 9000RPM. She redlines at 13000RPM. My query is can these engines run for extended periods at this rev range. My old bike brain can't comprehend this. Would be grateful of any help. P.S. I have no issues spending good money on good oil and regular servicing.

I understand your thoughts Brentis. I was used to 8k redlines for 1000cc bikes, then was shocked in the 80's at 9.5k. Current bike is 11.5k ... moral is? the parts are machined to better tolerances than the old air cooled stuff, they are lighter and will rev freer. Just change the oil regular and keep it maintained. The old adage, thrashing it will wear it out faster.......

[tigertim20]

Hi Folks,
Can someone out there enlighten me with their mechanical wisdom? I am getting back into motor cycling so have gone and purchased a 2004 Suzuki GSX250 inline twin. Rides well and is great little machine to get the "feel" of things again but........ I am not used to these high revving engines. To ride at 100kph, in top gear, the engine is pulling about 9000RPM. She redlines at 13000RPM. My query is can these engines run for extended periods at this rev range. My old bike brain can't comprehend this. Would be grateful of any help. P.S. I have no issues spending good money on good oil and regular servicing.

Drunkenmistake on here has ridden a cbr250 from dunedin to picton and return with no problems whatsoever - basically the same bike, except his redlines at 18000rpm....
Yes it does feel odd doing 9k rpm when a car does 2500rpm at 100km, but as long as the bike is maintained correctly with good oil and filters at regular intervals etc, it will be just fine. In a month or so, you wont even think about it, it is a tiny tiny engine, less than half the size of a 600ml coke bottle, it needs to rev to generate power. keep your servicing up to date and youll be sweet, Ive seen loads of those il4 250's do 100,000km happily

[ducatilover]

It's a twin not a four.
But, yes, those CBR mills last very well.

[tigertim20]

It's a twin not a four.
But, yes, those CBR mills last very well.

ahh my bad, maybe I should take a remedial reading class. . .

[ducatilover]

ahh my bad, maybe I should take a remedial reading class. . .

Or remember stupid shit about tiny bikes?

[The Singing Chef]

i looked after my sisters 2004 GSX 250 for her till it sold. It was stock gearing and it sat at 9k @ 100kph, you can only do around 135kph tops on one of those doing 11.5k (altho im 6ft2 and 100kgs).It had a faint chatter to the cam chain, but apparently that is normal. I rode it on the motorway everyday, 2up a lot of the time with the missus. The GSX is a aircooled/oil boiler parralel twin. Never gave me any probs and never skipped a beat, but i only rode it for six months. The water cooled GSXR 250s are alot quicker and high revving. That GSX250 felt like the same weight as my CBR600

Na bro mine does 170 indicated just hitting the redline, though i am 6ft and 70kg. It's pretty good for 2up, though i haven't experienced anything else to compare it too. Heavy bike but you get used to it, 9k at 100km is a little higher than mine, mine sits at about 8ish, 9k when i am doing 120km/h.

[skippa1]

hmmmmm, I get 1900rpm at 100kmh in 6th, mind you she revs out to a massive 5500rpm

[Brentis1]

Na bro mine does 170 indicated just hitting the redline, though i am 6ft and 70kg. It's pretty good for 2up, though i haven't experienced anything else to compare it too. Heavy bike but you get used to it, 9k at 100km is a little higher than mine, mine sits at about 8ish, 9k when i am doing 120km/h.

Many thanks Singing Chef! I would imagine that mine is revving a wee bit higher as I have about 30kg on you.

Sounds like they have no problems sitting at that level of RPM for a reasonable length ride. I just wanted to be sure before blowing an engine. I am using good semi-synthetic oil so suspect all will be OK. Thanks for your help!

[ducatilover]

Many thanks Singing Chef! I would imagine that mine is revving a wee bit higher as I have about 30kg on you.

Your weight does not change the gearing.
You may have a lower profile rear tyre than him or different sprockets.

170k on a GSX? That would have taken a while

[tigertim20]

Your weight does not change the gearing.
You may have a lower profile rear tyre than him or different sprockets.

170k on a GSX? That would have taken a while

he did say 'indicated' - we all know that indicated means fuck all on most bikes, but what else do we have to gauge it (assuming you dont have a GPS)

[ducatilover]

he did say 'indicated' - we all know that indicated means fuck all on most bikes, but what else do we have to gauge it (assuming you dont have a GPS)

Put a stick in the wind and observe the flex, extrapolate that with the gravity, wind and your tongue being on it?
You're right though, I remember the RG150 speedos were on the piss.

[The Singing Chef]

I also used a long piece of rope with knots tied into it at chosen intervals and strung it out as i rode, i hired a small Nigerian child to count the knots as i rode, came with an amazing deal too.

I found out that i had won $1,000,000 but hadn't been notified so if i send $5000 for management and transfer fees i can receive my money :-) and no worries mate, the bike likes to be in that range, get the best acceleration in that range in the 3rd and 4th gears keeping it high and giving it bursts to get through traffic jams.