Question about 2004 Triumph Triumph Bonneville

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Will tacho be accurate?

Just purchased 2004 Bonny with racing carbs, procom ignition, bigger sprockets etc etc.
Wanting to add a tacho kit.
My question is will the performance components (higher revs etc) would make the rev counter obsolete or inaccurate?

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Depends on what and where you are measuring ... if you are measuring rpm of the crank shaft ... there should be no change baced on different drive sprockets. The speedo will be different and the RPM will not match the expected speed because you changed the size of the drive and driven sprockets.

Posted on Jun 05, 2010


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Posted on Jan 02, 2017


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2004 Triumph Thruxton 900 tachometer not accurate

Hi, Pete have a priest on standby for Last Rites for more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Tachometer not working
Triumph Motorcycles

Jun 24, 2017 | 2004 Triumph Thruxton 900


How to tune / de-restrict a 2 stroke

2 strokes in lower ccs are usualy slow, so heres a list of things you can do to de-restrict and tune your 2 stroke.

1) Get a racing exhaust, Key part too most 2 strokes is a good exhaust, this will remove some restrictions. Gianelli, Big One, fmf and many others are available on ebay or your local bike shop.

2) Big Bore kit, adding a big bore kit can give up to 30% more performance, and will usualy de-restrict the bike. search ebay for (Bike Model) (year) Big Bore kit. it will come usualy with everything you need for the upgrade.

3) Carbon Reed Valves, are a key part too your acceleration, also removing the little cages that stop them opening all the way and replacing with big washers is another good step, make sure theres nothing for your reeds to nock on when removing the cage.

4) Boost Bottle, a boost bottle will help 2 strokes with no reed valves more then reeded bikes but will give alot more low and high end performace. search ebay for (bikes cc) boost bottle.

5) Jets, are a key thing when getting a bore kit or race exhaust. you MUST change the jets if you change exhaust, get bigger ones if you get an exhaust go a few sizes over and check the spark plug if its a brown tan/ grey collor you got it all right, if its black it means you have to much fuel so go smaller, and if its white it usualy means not enough fuel. you can buy jets from any motorcycle shop usualy around $1 a peice. you onyl need to change the Main jet.

6) Air Filter, you dont need it on most bikes but it could add extra acceleration, measure your carbeurator intake and search it on ebay for a K&N style filter, Power filter.

7) Restrictors in the intake, some 2 strokes have restrictors between the carb and the cylinder, it is key to remove these or drill them out to the size of the carb/ cylinder hole size.

8) Sprockets, if your lucky enough to have a chain and sprockets, its a nice trick to change sprockets on your bike.
For Top Speed - Bigger front sprocket & smaller rear sprocket
For Acceleration - Smaller front sprocket & bigger rear sprocket
by bigger or smaller i mean more or less teeth on the sprocket. if you go for speed your acceleration will lack and vice versa if you go for acceleration you will loose top speed.

9) Electical Restriction, Some bikes are restricted in the CDI, if yours does not want to reach a good RPM search up CDI, de-restriction. usualy it involves cutting a wire between the CDI and engine. and will unlock that slow engine into a screaming 2 stroke.

If you follow all these steps your 2 stroke will no longer be restricted and slow and will be the fastest arround.

on Feb 16, 2010 | Motorcycles

1 Answer

Why do none of your so called experts know how to de restrict an a.j.s.125 dde, or even answer if it can be done

different bikes restrict by different means, sometimes smaller carbs are put on other times the jets are just changed to a lower width, the exhaust shape can restrict airflow from the engine. sometimes the airbox restricts flow into the engine. so first stop is check how high a jet you can get for carb, maybe get a jet air filter racing kit.may need to change exhaust for a power pipe. you can put a bigger sprocket on front end for less accelleration but higher top end or smaller for higher accelleration. you can put a bigger sprocket on back for greater accelleration loosing top end. you could change the piston for a higher compression piston and/ or have the head skimmed. the list goes on and if its a 2stroke there's reed valve to play with.

Mar 18, 2013 | Motorcycles

1 Answer

How to make a motorcyle have more speed , is there any parts of the engine to be changed

Your best bet is to install a set of race cams. Tear down the head and remove the cams from both cylinders. Send them to California where they will be re-worked and then sent back to you. I suggest you have a Yamaha shop do the tear down and reassembly. When finished, it will be hard to hold on to the handlebars when giving it the gas. I am not kidding. You will wax even bigger bikes. Check out the following link. Contact Web Cam Racing (1-951-369-5144) in California and they can fix you up. Go to You would ship your cam to them by Federal Express and they would modify the cam to your specifications then send it back. Neither you or I can give them degree angles for rise or duration or any other spec they may need, so you just need to tell them what type of racing you do (street, track, quarter mile etc ), and what you want from the cam, take off from the line, top end speed, torque, etc.. Basically, tell them you just want to wax anyone dumb enough to challenge you.

Don't get too radical with the cam. Go too far and the bike will only start with a car pulling you at 30 mph. I am serious. Also tell them any modifications you have made > air cleaner, sprockets, tires, exhaust etc.. ASK FOR THEIR RECOMMENDATIONS on the above and on carb jetting and ignition timing. You may need to get a different CDI to manage the more radical timing.

Jun 27, 2011 | 2005 Yamaha V Star 1100 Silverado

1 Answer

I have 175 and 180 size jets in my carburetor on my 04 Sabre. Are these stock? My Dynojet stage 1 kit has 160, 165, 170, & 175...which are smaller...

It doesnt matter if the jets are stock or not it is a myth that the jets must be bigger when you put a stage one kit in. Remember stock jets are there for EPA standards and what size works to pass is what the manufactor will use. I have many times put smaller jets in a carb even on race bikes to get a better performance. I hope this helps.

Nov 03, 2010 | 2004 Honda VT 1100 C2 Shadow Sabre

1 Answer

How could i get my bike to build up more power on

well there are a few ways

1) Gearing, get a smaller front sprocket or a bigger back sprocket that would make it go slower but have more power. To make it faster and less power do the oposite, Big front, Small back sprockets. On the front you should only take / add 1 or 2 teeth on the back take about 4 or 5 depending on the amount you have.

2) A big bore kit would add extra power on take off.

3) Racing exhaust if its a small cc 2 stroke.

4) Carbon Reeds if its a 2 stroke.

5) Boost Bottle if its a 2 stroke (Not Nitrous).

Email for more assistance ( )

Feb 16, 2010 | 2003 Yamaha YZ 125

1 Answer

I have a 04 250exc leaking oil from behine the front sprocket is this a hard fix

Yes and No, But it does depend on your knowledge. It will mearly be a seal that needs to be replaced. You will need to drain your gearbox oil and remove the cover, chain, sprocket etc etc...If you have no idea it is not worth attempting.

Good luck

Nov 11, 2009 | 2004 KTM EXC 250 Racing

1 Answer

How can i make my aprilia sonic faster

arrow exhaust system,k&n airfilter,smaller rear sprocket and a bigger front sprocket,carb rejett,new power valve,power blade,clutch kit and thats about it buddy

Oct 04, 2009 | 2000 Aprilia RS 125

1 Answer

I want 2 make my bike faster i ordered a 15 counter sproket its one tooth bigger and i have a bigger muffler and a low budget its a 06 any ideas

a power blade will do good also a k&n airfilters rejett the carbs to the next size up so if its 155-160 boyesen reeds and a bigger front sprocket and a smaller rear thats about it buddy

Oct 04, 2009 | 2005 KTM EXC 450 Racing Usa

1 Answer


All you would need to do is replace the camshaft sprocket with an aftermarket adjustable one. There are marks on the sprocket that tells you + or - and TDC. This allows you to raise or lower the camshaft timing depending on what you're wanting to do.

Nov 01, 2008 | 1995 Ford Escort

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