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Iv desristricted my exhaust but hasn't made any difference wat else can I do apart from buying a bigger bore ect

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Re-jet the carburetor.

Posted on May 03, 2015

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04 Road King Custom whats the best and cheapest way to get mor power and performance?


performance exhaust system a set of performance cams big bore kit remap ignition ect ect ect

Mar 12, 2015 | Harley Davidson Motorcycles

Tip

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

2 Answers

Can I extend cylinder for derbi gpr 4t from125cc to 200cc or more


You can get a 150cc bore kit from derbi which is very easy to fit and cheap. It's on derbi.com and will give you a performance increase of about 5 HP bringing your total to about 20hp. Once you do that you can get a bigger exhaust also from derbi which should add another 3hp. I have the derbi gpr125 4t and I have done all the above, top speed is about 90mph and accelerates very very fast. Good luck.

Oct 12, 2010 | 2005 Derbi GPR 125 Racing

1 Answer

Got a new catalytic converter for my 97 4runner but the parts dont match up. The muffler pipe will not fit into the hole of the converter. the pipes are the exact same size.


did you buy a genuine part?and even if you did, toyota buy in exhaust components, so different makers will be slightly different re bore size,the ONLY way to make sure all the parts of the exuast fit, is to buy the complete system,if you cannot modify the pipes to fit.... please do not try to weld a cat onto a pipe.....

Sep 05, 2010 | 1997 Toyota 4Runner

1 Answer

I want to derestric my 2006 aprillia mx does any 1 know what i have to do as regards to exhausts and size of jets etc..


Best thing to do, would be to buy an aftermarket exhaust system, either complete, or just the muffler, a complete one would be better, as the header pipe is usally a bigger diameter. There are many brands to choose from, and varying prices. Put the exhaust on first, then worry about the jetting. Ride it first with the new exhaust, it may not need re jetting, depending on the brand of exhaust, the supplier should have the specs for any re jetting if needed. Mabey one size bigger on the main jet. Also, for extra performance, you need to alter your air box, or air filter system. A bigger exhaust will require more air flow intake to be of any use. Apart from that, it will sound great.

Jun 13, 2010 | 2005 Aprilia MX 125

1 Answer

Best carbs to increase power would 42 or pos 44 from gsxr models and how hard to set up?suzuki RF900RV


You will not get any noticeable Hp gains buy changing the carbs to a bigger carb. To get more Hp out of the bike you can change the exhaust pipes and muffler and may gain 10hp. The only true way to get a good Hp gain is to have it bored out and new pistons installed, Head work done like Port and Polish. Install new cam's.

Sep 30, 2009 | 1997 Suzuki RF 900 RV

1 Answer

Runs then cuts out


fix the leak in the head, because you changed the head with a bigger one, you'll have to buy a carburator jet kit and rejet your carb, it'll need a differnet gas/air ratio because of the head kit

Jun 09, 2009 | Fender 2 Stroke Full 49cc ATV # ATG-47B...

1 Answer

Bigger piston kit for rs 125 gp1 2002


hi 54mm is a standard bore not sure what sort of bore kit you can get as the bore is plated not sleved so it can not be rebored you can but a better ex pipe change the reed valves get the bore ported this will make a diffrence
hope this helps cheers jay

Mar 27, 2009 | 2002 Aprilia RS 125

1 Answer

Cleaning the key bored


pop down to pc world and buy anew one is what i would do but for the time being if windows xp go on start menu go to accesability and select on screen key bored.

May 18, 2008 | Acer Aspire 5500 5570-2609 Laptop

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