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back pressure in sump of bmw horizontal motorcyle70's push rod system Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Motorcycle Repair>> Motorcycle Engine Repair hgriffin New User Sep 21, 2013, 6:20 AM Post #1 of 3 (3364 views) back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In just overhauled the engine new valve guides valves honed bore and new rings excellent compression over 80lbs per square ins, but i am having quite an amount of back pressure in the sump and is using quite a bit of oil , oil is coming back into the air filter and is getting burnt through the carbs . can some one help to solve problem how can i nulify the back pressure any help would be greatfull e mail address email addy deleted. Use private messages function. (This post was edited by Discretesignals on Sep 21, 2013, 6:46 AM) Discretesignals Ultimate Carjunky / Moderator Sep 21, 2013, 6:29 AM Post #2 of 3 (3362 views) Re: back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In 80 lbs? That is low compression. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. nickwarner Veteran / Moderator Sep 21, 2013, 11:29 AM Post #3 of 3 (3334 views) Re: back pressure in sump of bmw horizontal motorcyle70's push rod system Sign In Definately too low. I'm guessing you needed to punch it out to the next overbore and replace the pistons and rings with the right size instead of give it a bottle brush hone.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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