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Post by barandchain on Sept 9, 2014 19:32:42 GMT -5
Looking for some help or input into attempting to repair a 750 throttle support. Can it be welded or is it a waste of time to attempt it. Is it aluminum or magnesium, I think that I have heard both being used in these saws, but what parts are what I am not for sure. Even better if there is one out there that is still in one piece, I'd be glad to help it find a new home! Thanks.
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Post by lesorubcheek on Sept 9, 2014 20:36:21 GMT -5
Hello and welcome barandchain. Not sure exactly what part you're referring too regarding throttle support. If it's the rear handle or the cover, then its made from magnesium. The throttle trigger is plastic and pivots on a steel pin. There's numerous parts associated with the decomp. As far as welding, I've never tried either aluminum or magnesium, so can't comment. Depending on what's broke and where, JB weld may be an option. If the handle section is what's broken, I doubt JB will hold it.
Dan
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Post by barandchain on Sept 9, 2014 21:07:52 GMT -5
The lower rear handle that is difficult to find, is what I am trying to repair. Homelite made these with a break on the dotted line just where it gets to the end of the saw right before the snubber. I am not one for the JB weld fix and you are right that the JB weld would not hold and withstand the use. I have heard that they did make an improved version. Anybody have any pictures of the difference between the two. Would be interested to see Homelite's improvements. Thanks for the response.
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Post by lesorubcheek on Sept 10, 2014 11:49:59 GMT -5
My misunderstanding.... the brace. Yea, there's been at least 2 or 3 versions since the 650's first. Pretty sure all the 750s had the '2C' version which was the latest and beefiest, but one never knows what may be on any given saw. At one time, I was going to try to make one from a 1/8" flat plate of aluminum. Never got around to it, but it wouldn't be too hard to at least do a redneck rig repair that way, just a matter of time. You may also consider a small plate that would overlap both ends where its broken and try to secure with some bolts, rivets, or even some JB to help hold the plate. If I can get to it, I'll try to post some pictures of how the different versions look compared to each other.
Dan
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Post by lesorubcheek on Sept 10, 2014 17:12:16 GMT -5
Here's at least 2 different versions. The top one is a 2C. You can see the thicker material around the snubber.  Dan |
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Post by barandchain on Sept 11, 2014 20:47:28 GMT -5
Thanks for the pictures. Definitely can see the difference. The brace I have is missing the part around the snubber, so I can't tell you which one I have, but you are right any given saw could have either depending on what was available for parts. Do you think that most of these braces broke because of use or someone not paying attention when putting the saw down. The anti-vibe mounts seem to be forgiving during use. The throttle handle/airbox don't seem to have an issue with breakage?
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Post by lesorubcheek on Sept 12, 2014 21:36:45 GMT -5
You're welcome. Not sure what caused the majority of breaks, but I'd guess they develop hairline cracks due to stress, from use and bouncing around, and as the cracks grow, they get weaker faster and faster until they finally snap. I've seen a couple throttle handles broken also. Heard of a couple more on various forums. Never broke one myself, so not really sure the usual cause there. 650s and 750s are very nice saws, but most will say they aren't as tough as the 2100s. Still, as long as you take care of them, they're some kick saws.
Dan
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