A forum for owners of Yamaha TTR250 trail and enduro bikes!

Matt G · Veteran Member

Tiny Tach

Cubber · Super Guru

Looks nice, Matt.

They're on sale in USA via Ebay, CLICKY for around $55.95 plus $37.00 p&p. confuse

That would be nearly £60 to anyone in UK. cry

Martyn

brindabella · Senior Member

so, for people with tachometers - can anyone say how fast the TTR engine can rev? more than 10,000rpm?

barra8 · Guru

brindabella wrote:
so, for people with tachometers - can anyone say how fast the TTR engine can rev? more than 10,000rpm?

The 2001 Yamaha TT-R250 came with a 28-horsepower, 249 cc, four-stroke, single-cylinder, air-cooled, four-valves-per-cylinder, double overhead camshaft engine with a bore and stroke of 73 mm x 59.6 mm and a compression ratio of 10.3:1. It reached its maximum 28 horsepower at 8,500 rpm and had a maximum torque of 15 ft.-lbs. at 7,000 rpm. The engine used a Teikei Y30P carburetor, a CDI ignition and an electric starter. The TTR-250 featured a chain-driven six-speed transmission with a manual clutch

Read more: 2001 Yamaha TT-R250 Specs | eHow.com http://www.ehow.com/list_7598022_2001-yamaha-ttr250-specs.html#ixzz21gbQEYy3

NOTE: If it is a Raid model this will be different as they run a different compression ratio,also different carbys (jets) porting,ect..may help but don't think it would reach over 10,000rpm without seriously expensive mods.

-- Edited by barra8 on Thursday 26th of July 2012 02:17:50 AM

barra8 · Guru

This may make it easier for you, oh and of course ttr's don't have rev limiters lol smile Notice how it says maximum power not ''LOWER limit''

Make Model	Yamaha TT 250R
Year	2001
Engine	Air-cooled, four stroke, single cylinder, DOHC, 4-valve per cylinder.
Capacity	249
Bore x Stroke	73 x 59.6 mm
Compression Ratio	10.3:1
Induction	TEIKEI Y30P carb
Ignition / Starting	CDI / electric
Max Power	28 hp 20.6 kW @ 8500 rpm
Max Torque	28 kg-m 275 Nm @ 7000 rpm
Transmission / Drive	6 Speed / chain
Front Suspension	Telescopic forks, Coil air spring oil damper, 280mm wheel travel
Rear Suspension	Monocross, 280mm wheel travel
Front Brakes	Single 245mm disc
Rear Brakes	Single 220mm disc
Front Tyre	3.00-21
Rear Tyre	4.60-18
Dry-Weight	113 kg
Fuel Capacity	12 Litres
Review	Motoring.co.za

Yamaha%20TT250R%2000%20%201.jpg

-- Edited by barra8 on Thursday 26th of July 2012 05:55:37 AM

barra8 · Guru

brindabella wrote:
I'm sorry but my original question still stands, the chart above does not help:

Question: If you have a tacho installed, what is the highest rpm you have seen indicated?

yes, I know the maximum power is developed at 8500rpm, but there is not a bike on earth that will not rev PAST its maximum power point. It a power curve, after all - maybe at 8500rpm it is 20.6kw and at 9000rpm it drops to 18kw and at 9500rpm it drops to 12kw and at 10000rpm a valve hits the piston and the engine "blows up" - ok just a silly example, but I am just saying it SHOULD rev past the maximum power point, and if anyone actually has a tacho installed (or has tried a dyno run) they may be able to give some indication as to what rpm can actually be achieved in the lower gears (NOT in 5th or 6th with standard gearing as it won't rev out fully).

As you said taking it past it's maximum power will have a good chance of dropping a valve or doing serious damage to the engine. Don't know why anyone would try it but not my risk i guess.

Even if you did push it further surely it would not go over 10,000 rpm if it max's out at 8,500rpm. I'd say 9,250 it would be at redline and damage would occur if not serious damage that's if you can even get it this high.

Without heavy duty (racing) valve springs etc. it would not be advisable to do...

A quick look at 450 specs should tell you 10,000rpm is not reachable without serious mods as first mentioned.

http://www.youtube.com/watch?v=1xPDjj1vzsY&feature=fvwrel

-- Edited by barra8 on Wednesday 1st of August 2012 02:09:41 AM

brindabella · Senior Member

thanks, barra8, that sets a nice LOWER limit of 8500rpm for "what will it rev to?".

I am wondering more about its "red line" limit - i.e. where it hits its rev limiter (if it has one) or where it just seems to be near over-revving and running out of puff (e.g. wide open throttle in 4th gear on a paved road).

given the relatively mild state of tune that the TTR has, I would be sure it can rev beyond 8500rpm.
and if someone has installed a tachometer, they should be able to answer this question.

(otherwise the answer, which has an impact on optimum gearing setup, can only be gotten by a tedious process of calculation from possibly inaccurate speedometer reading, primary ratio, gearbox ratio, final ratio, and tyre size).

brindabella · Senior Member

I'm sorry but my original question still stands, the chart above does not help:

Question: If you have a tacho installed, what is the highest rpm you have seen indicated?

yes, I know the maximum power is developed at 8500rpm, but there is not a bike on earth that will not rev PAST its maximum power point. It a power curve, after all - maybe at 8500rpm it is 20.6kw and at 9000rpm it drops to 18kw and at 9500rpm it drops to 12kw and at 10000rpm a valve hits the piston and the engine "blows up" - ok just a silly example, but I am just saying it SHOULD rev past the maximum power point, and if anyone actually has a tacho installed (or has tried a dyno run) they may be able to give some indication as to what rpm can actually be achieved in the lower gears (NOT in 5th or 6th with standard gearing as it won't rev out fully).

Henry · Veteran Member

Hi I fitted a similar thacometer,
yesterday i revved it up slowly but surely.

It wont get past 9000 RPM

In another post Garra said that TTR250 Cdi do have a rev limiter and an aftermarket Cdi can be purchased from ebay.

TTRfan · Super Guru

That is interesting Henry. I was asked only recently what the rev limit was on the TTR250 and the best info I could find was on Mossproof's 325 dyno charts which appear to show his engine topping out at just over 9,600 rpm.

Anyone know the TTR's top revs for sure?

Brian