Hi, guys

I have a suzuki savage LS650 i cured my backfireing with the white spacer mod.

My friend has bought one same model but abit younger than mine, his backfires, i have done a full carb strip down cleaned and white spacer mod on his, but still have backfireing, and i mean big backfireing and loud explosions in the muffler when you open the throttle, it will tick over nicely but has soon has you open the throttle you get loads of backfireng period .

Please can anybody advise what wrong.

mmg123 wrote on 12/13/11 at 23:12:55:

This is unusual for us, backfiring when you open the throttle.
You may have gone too far with the white spacer mod.  I'd put it back to stock.
And certainly, check the header and muffler for exhaust leaks.
Is it a stock muff?
what jets?
mileage and year?

You have stock air filter and muffler?

Routy wrote on 12/14/11 at 06:00:40:


ignition misfiring or timing. ??? Are these two seperate things ???

If you swing it so it points to the back of the bike, thats p[rime, & its gonna drain the tank, down is "on", but no fuel flows till theres vacuum from the carb to the petcock. Forward is reserve. Its "Off" unless its on prime, or unless the diaphragm is busted.

Can the head gasket cause this problem ???????????

Already plugged it, Also today done valve clearences, still backfireing, maybe person before has over tightened them and the problem is a bent valve. ????????????????

I dont know what the jet sizes are,( how would i find this out), i can borrow a compression test kit, can you please guide me has to ( what the compression should read). Thank you to all concernered for your help so far.


167000 miles