aldy13 Report post Posted January 22, 2017 Hi Guys My bike has started backfiring almost every time I give it more than a blip on the throttle, does anyone have any ideas where to look first? Regards Andy Quote Share this post Link to post Share on other sites
b40rt Report post Posted January 22, 2017 (edited) New plug first. Edited January 22, 2017 by b40rt Quote Share this post Link to post Share on other sites
aldy13 Report post Posted January 22, 2017 Sorry should have said I have fitted a new plug Quote Share this post Link to post Share on other sites
spen Report post Posted January 22, 2017 (edited) Does it pop on the overrun? Air leak in the exhaust? Edited January 22, 2017 by spen Quote Share this post Link to post Share on other sites
madmostin Report post Posted January 22, 2017 The rubber inlet manifold is not great. Inspect for any cracks or poor fitting. 1 Quote Share this post Link to post Share on other sites
undertheoaks3 Report post Posted January 23, 2017 Mine had a poor connection between the carb and intake boot, I also fitted a air screw adjuster makes all the difference. Quote Share this post Link to post Share on other sites
aldy13 Report post Posted January 24, 2017 On 22/01/2017 at 10:24 PM, spen said: Does it pop on the overrun? Air leak in the exhaust? Yes only on the overun, should you use exhaust sealer where the front pipe meets the back box? Quote Share this post Link to post Share on other sites
spen Report post Posted January 25, 2017 Generally an air leak on the inlet will cause the revs to 'hang' when you shut off, a leak in the exhaust can cause popping. Doesn't hurt to seal it. Quote Share this post Link to post Share on other sites
2stroke4stroke Report post Posted January 25, 2017 Slacken off all the mounting bolts before snugging down the joint to the cylinder head (assuming gasket there is okay). It could also be a leak at the pipe/silencer join - sometimes exhaust clamps can become "bound" and need relieved with a hacksaw to allow full pressure on the pipe. Quote Share this post Link to post Share on other sites
