Dazon top end power loss after MRP exhaust install

Posts: 3 · Joined: 12 Aug 2008 Posts: 3 Pictures: 0

Hey guys whats up iam having trouble with my Dazon 250 i just installed a MRP exhaust system on my buggy now i have lost my top end power i have checked the valve adj,the air fuel screw i have aready changed the carb to a 32mm khieni (had the carb on before the exhaust). i was running fine untill the exhaust system any ideas maybe bigger jets and fuel line oh also tried the end cap still same result

Posts: 2640

did you check your spark plug? get a reading... you can be running way lean with the new gear... I believe the jet that comes in that carb is a 128, which is no way near enough if you are running HP exhaust and carb... Get a reading off the plug and let us know how it looks... That'll get you pointed in the right direction!

John Very Happy

Posts: 1229

You created a reduction in back pressure when you installed the new exhaust. By reducing the back pressure you created more flow and you are probably running lean on the top end.

You will need to rejet to correct. Check you current main jet size and then get a selection of jet 5-10 sizes larger(i.e. if your stock jet is a 112 then go to 117 to a 130). You may have to play with it a little bit to get the optimum but it should help.

Glade

Posts: 3 · Joined: 12 Aug 2008 Posts: 3 Pictures: 0

Thanks guys i'll pull the carb and play around with some diffrent jets i'll let you know whats happens.

Posts: 2640

check the spark plug first, to confirm you have a fuel issue. The spark plug is the easiest way to tell what is going on with your engine on the inside. If you just pull the carb and start playing with jets, you could spend a hundred dollars on jets before you find the right one...

Check the spark plug... If it is really white, then you need a BIG jet... my 32mm carb on a modded 150cc buggy is running a 145 jet currently... My mods are intake, riser, carb and K&N filter, and my exhaust is gutted to the max, plus I am running a cam...

You may need a 137.5 or you may bneed a 145 like me, but you wont know unless you get a reading on the plug...

Good luck Very Happy

john

Posts: 3 · Joined: 12 Aug 2008 Posts: 3 Pictures: 0

well i driled the carb jet out and it runs great thank you guys next project some tunes might have to get a 2 battery