ninjette.org - View Single Post

Jim L · July 15th, 2014, 06:02 AM

Don't tear it down yet. I think you testing so far is inconclusive.

What were the actual numbers on you compression and leak down test? How were they done? Engine warm or cold? Oil put into both cyl to check rings? Did you use a leak down tester for small bore cyl? (the differential orifice should be 0.020" dia) What do the plugs look like? Good spark on both sides?

These are the first things I would look at; and then follow the detective trail, replacing the cheapest/easiest first.

I am a retired A&P mech for 50 years; and I recently got nailed by not doing the above correctly. I spent $2,000 on a top overhaul of a small diesel, by not testing the injector pump ($200) first. Yep, it was the pump that' "Oh no, they never go bad"'

Let's spend some more time scratching our... er, heads first.

Cheers,

July 15th, 2014, 06:02 AM	#5
Jim L ninjette.org member Name: Jim Location: Salt Lake City Join Date: Jun 2014 Motorcycle(s): Street:72Bonnie, 68BSA, 94KTMEXC400LC4; Track: CBR600, R6, NS125GP, 61Cotton TelStar; Dirt:MX -3, Trials - 5 Posts: 32	More checking first !!! Don't tear it down yet. I think you testing so far is inconclusive. What were the actual numbers on you compression and leak down test? How were they done? Engine warm or cold? Oil put into both cyl to check rings? Did you use a leak down tester for small bore cyl? (the differential orifice should be 0.020" dia) What do the plugs look like? Good spark on both sides? These are the first things I would look at; and then follow the detective trail, replacing the cheapest/easiest first. I am a retired A&P mech for 50 years; and I recently got nailed by not doing the above correctly. I spent $2,000 on a top overhaul of a small diesel, by not testing the injector pump ($200) first. Yep, it was the pump that' "Oh no, they never go bad"' Let's spend some more time scratching our... er, heads first. Cheers,
	1 out of 1 members found this post helpful.