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  #1  
Old 16th October 2014
savagegarden savagegarden is offline
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Default 70 XLCH--weak pull when full throttle

I recently fixed the clutch on my 70 XLCH and have been doing a little bit of riding. When I full throttle I just don't get much pull from the engine--bike stays around the same speed and I don't feel much of a difference in power from the back wheel. When I shift I'll get goin a little quicker.

When I was warming up the bike and it was in neutral, I full throttled it and the engine was going in and out--seems like a gas flow issue but I'm not sure.

I read skunzer's troubleshooting thread but would like to get some advice. Here's what I think I should check/do:

1. Clean the fuel tank filter
2. Adjust the carb (it's a bendix (either a 69, 70, or 71), I'll look up the number and would appreciate some help on how to tune it)
3. Fix the points? (I don't know what this means and would appreciate some help here)
4. Make sure the pushrods are moving freely

Anything else?
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  #2  
Old 16th October 2014
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Monte03 Monte03 is offline
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Default

Is the Clutch Slipping? Are the RPM's climbing but feel like you are towing a boat anchor? Those plates need to be bone dry with the proper 3/16" spring adjustment as per the manual, Bendix came out in 1972 but many people run them, go to the Red Stickies notes, there is a section on Bendix- Zenith carbs... And by all means locate a Shop manual, see them on eBay all the time, you can also easily check gas line flow by pulling the hose off the carb, open petcock, point hose into a Pail, ABCS first...
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  #3  
Old 16th October 2014
savagegarden savagegarden is offline
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Default

Thanks for the reply. I set the clutch springs to the manual recommended 3/16" adjustment.

I'm not sure if the clutch is slipping. If I'm in first and going full throttle (and not getting any power) I don't see how this is a clutch issue. The clutch is already engaged at this point, right? Please let me know if I'm a complete doofus here.
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  #4  
Old 17th October 2014
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Default

If no Tach to read, I am sure you would hear the motor Rev if you were slipping, I think you need to state what you have done ( or not done ) to the motor? Is it breaking up when WOT? Too much un knowns here but there are others that will chime in. To answer your above statement, You would slip when engaged, being Engaged to a gear does not mean all is ok within the basket, it can be slipping... How did this bike run prior to working the Clutch??
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  #5  
Old 17th October 2014
savagegarden savagegarden is offline
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Default

I bought the bike in July and haven't touched the motor. The mechanic who was supposed to fix my clutch (never did, ended up being a release rod issue and I also picked up Chevelle's worm gear just to be safe) said that the engine knocks, not sure if that's relevant here.

Yes it breaks up when I WOT--that's a good description. When it's in neutral Ill go WOT and the engine revs high but goes in and out.

The bike ran ok when I bought in in July, then I started having issues with the clutch in August after a few rides. The issue was that the bike would lurch when shifted and it was difficult to shift into neutral. My mechanic (Junior) opened up the crank case and found silicone around the dry clutch, but no gasket. He replaced my clutch plates and put a gasket on the dry clutch and over the crank case in general. I had to set the release springs when I re-opened the crank case to fix the release rods.
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  #6  
Old 17th October 2014
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You could say the bike has poor acceleration if that helps at all. Pretty vague I know.
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  #7  
Old 17th October 2014
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two very general things for the carb: "spitting or sneezing" into the air cleaner while try to accelerate indicates the carb is jetted lean, and needs more fuel. "blubbering" while accelerating indicates too rich, drowning it with gas and needs less fuel. which of these two is yours doing? or is it neither?
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  #8  
Old 17th October 2014
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Whats your exhaust system?
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  #9  
Old 17th October 2014
savagegarden savagegarden is offline
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I'll have to listen to the carb a bit more carefully to get an idea of either rich or lean. I'm gonna try to take a video tomorrow, put it on youtube, then post it hear--hope the sound works out well.

The exhaust system is stock from what I can tell.
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Old 17th October 2014
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if your exhaust has baffles, pull them out and give 'er a try. a vid of it running could definitely help. '70 xlch is the first year xlch to have a battery instead of a magneto, are you sure your electrical system is in tip top shape?
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