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Post by 926am on Jul 30, 2016 11:43:30 GMT -5
When I get it apart I'll check the trueness of the cylinder sleeve. If that's warped or cracked I suppose it could also be a candidate.
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Post by 926am on Jul 29, 2016 9:29:22 GMT -5
Yes, the head was checked for cracks when it was resurfaced. I'm waiting on a new head gasket before disassembling the engine. Definitely over-torqued the head previously, but w/resurfacing & new gasket I thought I'd be good.
Certainly possible gasket was put in upside down (if that can happen)
Thanks for all the ideas, will update when I have resolution.
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Post by 926am on Jul 24, 2016 14:11:19 GMT -5
Yes new gasket. Dumb question: what is the proper orientation?
Didn't realize there's a top and a bottom.
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Post by 926am on Jul 24, 2016 5:35:55 GMT -5
Hello, I'm hoping to get some ideas on a problem I'm having with my CF Moto 250: coolant leaking out of the head gasket at the front of the engine.
I recently noticed metal shavings in the oil screen, so changed out the crank and when I got it running it leaked coolant. I took the head off and had it machined flat, thinking that was the issue.
Put it all back together and when I was filling the coolant it was literally pouring out the head gasket area. While cold!
Any thoughts would be much appreciated. I'm stumped.
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Post by 926am on Jun 7, 2016 16:00:00 GMT -5
No, I didnt check that (brand new head.) I'll check it when it comes off.
Good suggestion.
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Post by 926am on Jun 5, 2016 10:27:47 GMT -5
Just buttoned up a CF250 and seem to be leaking coolant out the head gasket area. (All new gaskets) Checked all my fasteners, found 2 on the cam gear side that weren't torqued. Tightened them, but not much better.
Before I rebuild, is there anything I should look for that may also have contributed to the leakage?
Thx.
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Post by 926am on May 31, 2016 20:21:50 GMT -5
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Post by 926am on May 31, 2016 20:21:10 GMT -5
![]() My concern is that not all the ports are completely open. Gasket material is 3-layer metal. |
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Post by 926am on May 30, 2016 18:43:31 GMT -5
Regarding a CF250 head gasket, not all ports are through. Is there a reason for this? It will fit otherwise, just a few of the ports are blocked.
Was thinking of dremeling out to completly match cylinder/head (vs just drilling a small hole)
Thoughts?
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Post by 926am on May 28, 2016 14:20:57 GMT -5
Update: I took apart the lower-end (to install the oil orifice on the crankshaft) and I think I found the over-heating cause. The head gasket did not have all ports through. There was significant blockage.
When I rebuild I will be dremeling out the new gasket to match the cylinder orifices.
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Post by 926am on May 16, 2016 19:13:22 GMT -5
Yeah, I tried to adjust the needle but it doesn't allow for adjustment. Bumped up the pilot jet to #45, but still hard starts. I'm going to to try a colder plug, & possibly 'genuine Honda' enricher. Starts great on ether!
A baffle is a bolt-in piece that adds restriction to the muffler. Since its straight-through, I figured maybe it needed a little back pressure.
Thanks for the tip on the Briggs/Stratton, will keep that in mind.
Can't wait to get this thing running right!
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Post by 926am on May 13, 2016 14:30:22 GMT -5
Question on the jetting: info online says to do the main jet first, then the pilot. But, I'm getting lean indications at idle and at speeds below 20 mph (1/2 throttle) which indicate the pilot jet. (Also, I cleaned out all passage-ways w/cleaner and guitar string, just in case.) When I had the #150 jet installed I noticed a big difference at idle, (sounded deep) but it didn't ride well and the plug was black (serious bogging.) Now I have a #135 main and #42 idle, and I added a baffle to the muffler, and it has good pick-up.
So do I keep working the pilot circuit, or try the main?
Symptoms are hard cold starting, and a white/ash plug. (I don't see any point in taking her onto the highway until I get this resolved.)
Thanks for your help. I feel like I'm close to finishing this project. (worse case scenario I install a stock muffler, but not yet!)
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Post by 926am on May 4, 2016 18:49:38 GMT -5
Thanks for the tips. The new carb enricher didn't have the same connections as the old one, so I put the old one back on. I'll try testing it like you described.
The muffler was more a matter of money than performance. Not my first choice, but a savings of $200.
I ordered a set of pilot jets, trying to guess which would be the best to try first (they're due in next week.)
I might try drilling out the pilot jet...
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Post by 926am on May 4, 2016 14:54:19 GMT -5
It's a cn250. Complete rebuild (newcrank/piston/head/carb.)
I'm having 2 problems: hard cold starting & over-heating (& faulty gauge temp reading.)
It seems the over-heatingmight have been fixed. I had to jack up the front end & run w/rad cap off. W/o a functioning gauge I'm proceeding w/caution, but it looks like it's no longer melting temp sensors.
Regarding the hard start, I've tried adjusting the idle mix screw, checkd valve adjust, checkd for leaks, ordered new choke (seems to work slowly.)
I have another bike (suzuki gs 500) & when I ordered new main jets they also sentnew pilots. Made me wonder if there's a formula (for pilots.)
Cf moto v3 has stock intake, 32mm cvk carb, #150 main jet, & straight through muffler.
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Post by 926am on May 4, 2016 12:00:57 GMT -5
Yes, I am waiting on a new enricher which I hope will act quicker.
Regarding pilit jet: how is a determination made to change? Trial and error, or off idle acceleration? Most of the available information deals w/main jet, not a lot on pilot/idle jets.
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